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  1. #51
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    Salespunk, I've noticed you on the Socal Forums. My wife and I are moving out to LA in a few weeks and I'd love some advice on where to ride, where not to ride, etc... Or someone to ride with once we get settled in. I've been checking out trail reviews, and socal forums, but nothing compares to someone who actually knows the area!

  2. #52
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    So I/m 5'10 and I rode the M6 (during a demo) , Medium with a 65mm stem and felt good.
    The large was not available.

    I currently ride a Blur LT medium with a 70mm stem and feels ok.

    Should I be good with the Medium M6? I'm 5'10

    thanks for the input.

  3. #53
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    Quote Originally Posted by Pedro Rios View Post
    So I/m 5'10 and I rode the M6 (during a demo) , Medium with a 65mm stem and felt good.
    The large was not available.

    I currently ride a Blur LT medium with a 70mm stem and feels ok.

    Should I be good with the Medium M6? I'm 5'10

    thanks for the input.
    I'm 5'10" as well (32" inseam) and honestly could have gone either way depending on what I was looking for.

    I demo'd a large at interbike and ended up getting a medium last week. The large felt just a little more stable but I had trouble moving around and behind the saddle. It seems like if you want a more all-around bike, go for the applicable size and if you want more of an enduro/super-d racer, you go up a size so it'll be more of a mini-DH bike like some of the other 6" 650b bikes.

    After putting 70 hard miles on it last weeek it didn't feel cramped at all, even though I put the 50mm stem and 740mm bars from my M5.7 on it.

  4. #54
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    I am 5'10" as well with a 30 inch inseam and demoed a large a couple of weeks ago. It felt really good but slightly less flickable than I had hoped. I am going to try a medium soon hopefully but I would certainly be happy with a large. The large was very stable at high speeds which was obviously nice.

  5. #55
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    Quote Originally Posted by Pedro Rios View Post
    So I/m 5'10 and I rode the M6 (during a demo) , Medium with a 65mm stem and felt good.
    The large was not available.

    I currently ride a Blur LT medium with a 70mm stem and feels ok.

    Should I be good with the Medium M6? I'm 5'10

    thanks for the input.
    You are in a good position because you could ride either size. If you are going with say a 50mm stem, then I would lean towards the large. I am also 5'10" and I think it fits me perfectly the 50. Also consider where you are going to run your seat. I am not a believer in the "KOPS" method of placing your seat. Keith Bontrager and others have debunked this having an effect on efficiency. However, the slack seat angle will make it harder to keep the front end weighted for a climb. You adjust to this pretty fast, but some don't like that aspect of the Mach 6. My seat is slid pretty far forward to compensate for this and since I have the large I had room to do so. I would have had to have the seat pretty far back on a medium.

  6. #56
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    I am also 5' 10" and could have gotten a large as I am also between the two sizes.

    My medium M6 came with the stock stem, which I think it is around 80mm. Looking down at the front hub, the handlebars are just behind it.

    Here in San Diego, you are often pedaling to the top of what you are about to go down, so from that perspective, having the stock stem I think offers a little more control over the fork for the ups, and certainly offers enough confidence for the downs because of the head tube angle and the longer travel, so the medium is fine. By comparison, I would say my M6 with the 80 mm stem feels about 1/3 lighter on the front end than my M429C with a 70mm stem (again because of head tube angle and more travel).

    If you are doing more DH stuff, a shorter stem will put your weight even further behind the fork which I would imagine would start to get annoying if you do a lot of climbing. If I was more of a park rider, I think I would have gone with the large and a shorter stem.

    Having the medium M6 allows me to use the bike in more of an XC setting where I need it, but also allows me to use the bike in a more downhill'ish mode if I need that also.

  7. #57
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    Mach 6 Frame size

    Wouldn't an extra 30 mm of top tube keep the front end weighted as much as 30 extra mm of stem? I would think so, but not 100% sure. The axis is the rear wheel, which is why a half an inch of chainstay length changes handling so much. I will take the easy manualling of short chain stays any day.

    I also have the option of running the seat further forward on the seatpost with the large, which will definitely aid in climbing.

    Most of the reviewers didn't like the long stock stem, but it's all a matter of preference.

  8. #58
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    People need to stop worrying about the seat tube angle. It's actually steeper than a M5.7 and even the 429, and nobody complained about them.

    What's happened is that most of the other 6" bikes have steep angles because their suspension squats under power while the DW-link extends. They have to have steep seat tubes, Pivots don't...that's why all Pivots have slack seat tube angles.

  9. #59
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    Mach 6 Frame size

    It may be fine at average height, but I can see it would be an issue for someone running a very long seatpost. Because of the virtual seat tube angle, you could have a much slacker angle than what it's designed for.

  10. #60
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    Quote Originally Posted by tadmcmichael View Post
    It may be fine at average height, but I can see it would be an issue for someone running a very long seatpost. Because of the virtual seat tube angle, you could have a much slacker angle than what it's designed for.
    The virtual ST angle is based on whatever they consider the average seat post extension for the applicable height for the frame...or somewhere around where people who buy the recommended size have theirs. Nobody is talking about going down a size, only up if you want a longer top tube.

    This is neither a Mach 6 or a Pivot "problem." They all have slack seat tubes and nobody spoke a word about it until someone reviewing the M6 looked at the website or brochure and said, "Hey, this is slack." They didn't say it didn't fit, put their weight too far back, couldn't climb, nothing. Now everybody acts like it'll flip over if you even look at a hill. The M6 was voted the most versatile in the MTBR trail bike review, FFS.

    I have a 50mm stem on my medium and it climbs steep sections just fine. It doesn't take much effort to get the front wheel up and over an obstacle, but it doesn't take any to keep it on the ground either.

  11. #61
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    Mach 6 Frame size

    Quote Originally Posted by SDMTB'er View Post
    I am also 5' 10" and could have gotten a large as I am also between the two sizes.

    My medium M6 came with the stock stem, which I think it is around 80mm. Looking down at the front hub, the handlebars are just behind it.

    Here in San Diego, you are often pedaling to the top of what you are about to go down, so from that perspective, having the stock stem I think offers a little more control over the fork for the ups, and certainly offers enough confidence for the downs because of the head tube angle and the longer travel, so the medium is fine. By comparison, I would say my M6 with the 80 mm stem feels about 1/3 lighter on the front end than my M429C with a 70mm stem (again because of head tube angle and more travel).

    If you are doing more DH stuff, a shorter stem will put your weight even further behind the fork which I would imagine would start to get annoying if you do a lot of climbing. If I was more of a park rider, I think I would have gone with the large and a shorter stem.

    Having the medium M6 allows me to use the bike in more of an XC setting where I need it, but also allows me to use the bike in a more downhill'ish mode if I need that also.
    The above captures my thoughts/feelings on my Mach 6 vs my Tallboy as well. I'm just up the I15 freeway from him (Temecula), so I'm sure we ride similar type terrain.

    I'm 6'-0" and ride a Large Mach 6 with 70mm stem and 760mm bars. On my Large Tallboy I run a 80mm stem and 750mm bars. I feel both fit me perfectly.

  12. #62
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    For your reference, my height 168cm and ride on Medium M6 with RF Atlas 35mm stem. Enjoying the ride and love it.

  13. #63
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    Looking for more info on this, hoping to get a few more "medium vs large" inputs. I'm 5'11" with a 32 inseam. Borderline on which size to get as I'll be running 35mm stem and 780mm bars. Right now I have my order placed for a large but have until Sunday night to change it before it starts getting built. Also will be going with a fox 36 @ 160mm instead of a 150mm fork.

    Coming off a yeti sb66 in a medium that was run with a 50mm stem and 740mm bars. That felt right at the edge of comfortable. Riding is trail with aggressive descents and the occasional 10-12 foot gap jump.

  14. #64
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    Large makes more sename than medium based on your size.
    Safe riding,

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  15. #65
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    Idaho, I am 5'10" with a 30" pant leg inseam. I was on the fence between a large and medium and could have gone either way but ended up going with a medium with an 80 stem. The large felt very good and I certainly could have ridden it but the medium was more flickable and better for riding tight single track around my area. The large with a 35 sounds pretty much perfect for you. You are going to be very stoked on the M6. Stick with your large order.

  16. #66
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    At 5'10" with a 50 mm stem, I love my large. Based on the stem you want to run, you are firmly in large territory.

  17. #67
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    Thanks for the input. I will stick with the large I had intended on ordering and get it posted up in the Mach 6 build thread once it's done. Now just tossing around wheel ideas as there are an incredible amount of options!

  18. #68
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    I'm 5'10 with a 32 inseam, and demo a medium with a 65stem, a bit to small for me.

    I ended up ordering a large which I am currently building iwith 750bars 50mm stem and a 160mm pike.

    Just waiting for my wheels in order to ride it.

  19. #69
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    I agree with tadmcmichael. 5'11" running a large with a 50mm stem for about a year. Your 35mm stem on a medium would be far too small unless you were coming straight over from BMX with a strong lil bike preference.

  20. #70
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    Quote Originally Posted by Idaho View Post
    Looking for more info on this, hoping to get a few more "medium vs large" inputs. I'm 5'11" with a 32 inseam. Borderline on which size to get as I'll be running 35mm stem and 780mm bars. Right now I have my order placed for a large but have until Sunday night to change it before it starts getting built. Also will be going with a fox 36 @ 160mm instead of a 150mm fork.

    Coming off a yeti sb66 in a medium that was run with a 50mm stem and 740mm bars. That felt right at the edge of comfortable. Riding is trail with aggressive descents and the occasional 10-12 foot gap jump.
    I'm 5'11, ride aggressively downhill, and there are a lot of steep technical climbs in my area. I was on a Yeti SB66c Medium with a 35mm stem and had 711mm bars. I had a 65mm stem on the SB and it felt too long for sure. 50mm probably would have been my max on a medium. I am now on a Medium Mach 6 with a 50mm stem and 760mm bars.

    I prefer more nimble bikes that are easy to jump and good in technical terrain over super long and slightly more stable rides so that almost always puts me on a medium frame. Over the SB66, I found the seat tube on the Mach 6 to be quite slack and it was hurting my back on the steep climbs we have. I didn't have this problem on the SB66. I switched quickly over to a 160mm Pike with travel adjust and that helped a lot, though I still feel it's an issue for me. I slid the seat quite far forward on the rails which helps as well. I think that's the main thing with guys 5'11 going to a medium - you are pretty far over the back wheel when your seat is at full height. The top of my saddle is 12.25" out of the seat tube at full height with clipless pedals. I have room to lower my KS LEV 150 post 2.5".

    If you are 5'11 and adamant about using a 35mm stem, I would say you should probably go with a large. A 35mm on my medium would be a touch too short and this is coming from someone who prefers a shorter cockpit.
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  21. #71
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    Quote Originally Posted by NOBLwheels View Post
    I'm 5'11, ride aggressively downhill, and there are a lot of steep technical climbs in my area. I was on a Yeti SB66c Medium with a 35mm stem and had 711mm bars. I had a 65mm stem on the SB and it felt too long for sure. 50mm probably would have been my max on a medium. I am now on a Medium Mach 6 with a 50mm stem and 760mm bars.
    If you subscribe to the formula of 2/1 bar width increase/stem length decrease, a 35mm would be close enough with 780mm bars.

    I'm an inch shorter and use 750mm bars with a 50mm stem on a medium. No problems climbing and it seems to really rail corners with the rearward bias that an attack position gives. The hub is way forward of the bars when looking down, but it works. Best of all is that I don't have to have the saddle lowered to get behind it (and not get hung up in that position), like I did on a large.

  22. #72
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    Seems to be a few conflicting reports but I settled on the large ultimately. Hope it works out as that's also what Pivot suggested when I called them. The said on this bike people will generally up-size where as they will generally down-size on their new XC bikes.

    Ended up with Chromag BZA bars at 780mm and a 40mm Haven stem as the 35mm Atlas from Race Face was out of stock.

  23. #73
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    I believe you'll end up pretty happy with your build Idaho. I have the same height and inseam measures and built my Mach 6 with a size large frame, 780 mm wide bars and a 50 mm stem. It feels great! Very playful and easy to throw around

  24. #74
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    Hi, I found a very good deal for a new small mach 6 frame, however I am 5' 10"
    I Demoed it, at first I felt it small as expected. then after a few adjustements of the seat and a wider handlebar I felt it better. Almost as my currently medium bike.

    unfortunately I cannot demo a M or L frame. so my question is if a size smaller than the recommended would be fine?. I want it for AM.
    In the geometry charts there is only 0.57 inches of difference in the top tube lenght.

  25. #75
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    Quote Originally Posted by albxor View Post
    Hi, I found a very good deal for a new small mach 6 frame, however I am 5' 10"
    I Demoed it, at first I felt it small as expected. then after a few adjustements of the seat and a wider handlebar I felt it better. Almost as my currently medium bike.

    unfortunately I cannot demo a M or L frame. so my question is if a size smaller than the recommended would be fine?. I want it for AM.
    In the geometry charts there is only 0.57 inches of difference in the top tube lenght.
    Wow 5' 10" on a small?? My GF is 5'6" and she could easily be on a medium...she rides a small with a 60-75mm stem.

    I'm 5'11" and ride a large with 65mm stem and could easily ride a XL. No way I could ride a medium unless I went with a 90-100mm stem which isn't a setup I'd want.

    FWIW - we ride techy tight AM forest trails in BC.

    Having said all that there is more to bike fit than height so if you felt okay on the small that's more important than 1000 internet opinions on bike fit.

    What size stem was on the bike you tried? If it was short at least you can put a larger stem on it. If it was a longer stem you won't have any way to extend the reach since you already tried some wider bars.
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  26. #76
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    The stem was 70mm longer, I can order the Medium but it would be a little more expensive. Since the small is already in my country (Mexico) and the medium have to be import it.

  27. #77
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    I'm 5'10 and just bought a Large with a 55mm stem.
    I did demo the medium and felt small for me.

    I think you should be at least on a Medium, small no way.

    The guys from the bike shop should be able to tell you that the bike it's to small to small for you, if not then their are just trying to sell the bike no matter what.

  28. #78
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    Pedro you are right.

    I will order the large frame like you, since I want to use a short stem.

    Thank you.

  29. #79
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    I'd say it's risky for the long term personally, but if u feel ok while demo-ing the small and it feels OK, then fine, especially since it's such a deal. Personally I wouldn't do that as you always 'grow into the bike' after a few months and I know I would regret a decision like this. I'm 5'11 and I ride a Large and after changing stem, etc. it fit me like a glove. I'm a pretty techy rider too...and good luck!
    I have too many bikes, but it's not enough

  30. #80
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    Mach 6 Frame size

    Quote Originally Posted by albxor View Post
    Hi, I found a very good deal for a new small mach 6 frame, however I am 5' 10"
    I Demoed it, at first I felt it small as expected. then after a few adjustements of the seat and a wider handlebar I felt it better. Almost as my currently medium bike.

    unfortunately I cannot demo a M or L frame. so my question is if a size smaller than the recommended would be fine?. I want it for AM.
    In the geometry charts there is only 0.57 inches of difference in the top tube lenght.
    I would wait - a ride that is a few hours is different than a demo. You want a bike that is big enough to make adjustments without going to extremes. Your height is right in the middle for a medium or a large. I got the medium and I am also 5 10 with a 33 inch inseam and the bike fits me perfectly. Using the stock stem at 65mm and stock bars at 740mm.

  31. #81
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    Wow, at 5'10" there is no way I'd go with less than a medium. At 5'11" with a 35mm stem, my large feels like it should have been with a 50mm. I would have been proper screwed had I got a medium in my opinion. That is with 800mm bars as well.

  32. #82
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    Agree! At 5'11, longish arms and legs, I'm on a large with a 50mm stem and 780mm bars and it feels spot on. A medium sized frame would feel a little cramped with this set up for sure. A small for a 5'10 I doubt that would work for the long haul...

  33. #83
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    At the end I ordered a large frame.

    Thank you all of you for the answers.

  34. #84
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    Here is me at 5 10, 33 inch inseam on a medium M6. The bike feels perfect for me.

    Mach 6 Frame size-screen-shot-2015-01-24-4.41.30-pm.jpg

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    What size stem you running? I just ordered a mach 4c 27.5 in size large with a 70mm stem and I'm 5'10". I live in Texas with all types of riding, just no downhill. The new mach 4 has a slightly longer top tube. Did I make a mistake on Size? I can change my order, but need to do so asap!!! I'm currently on a large Tallboy.


    Quote Originally Posted by SDMTB'er View Post
    Here is me at 5 10, 33 inch inseam on a medium M6. The bike feels perfect for me.

    Click image for larger version. 

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  36. #86
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    Mach 6 Frame size

    Quote Originally Posted by kumquat View Post
    What size stem you running? I just ordered a mach 4c 27.5 in size large with a 70mm stem and I'm 5'10". I live in Texas with all types of riding, just no downhill. The new mach 4 has a slightly longer top tube. Did I make a mistake on Size? I can change my order, but need to do so asap!!! I'm currently on a large Tallboy.
    80mm (stock stem).

    I would have gotten a large if I picked up a Mach 4 as they run on the small size. I think you will be fine.

  37. #87
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    you should be good, I have a Mach 6 with a 55 stem but I do a lot of DH, It fits perfect.

    You should be good with L and a 70mm stem

  38. #88
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    Mach 6 Frame size

    Quote Originally Posted by SDMTB'er View Post
    80mm (stock stem).

    I would have gotten a large if I picked up a Mach 4 as they run on the small size. I think you will be fine.
    No, the M4 is 6/10" longer.

  39. #89
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    Quote Originally Posted by tadmcmichael View Post
    No, the M4 is 6/10" longer.
    Yes, this is correct, the m4 is longer.. I actually think the gentlemen above looks a little big on the bike so I'm going to stick with the large. Especially since im in flat texas. 5 10 sucks for sizing

  40. #90
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    Mach 6 Frame size

    I look at it the other way, you can't make a mistake. Since I am 5'10" I could ride a medium or large and be comfortable. Just went the large route because I like to ride a 50mm stem.

  41. #91
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    It also depends on what trails you ride....I ride a m6 medium and am 5 10, it is great on the bigger open trails but my old 5,7 was better on the tighter single track, I am so glad I didn't go with the large as I would have really struggled on the tighter local trails....

  42. #92
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    Mach 6 Frame size

    Quote Originally Posted by kumquat View Post
    Yes, this is correct, the m4 is longer.. I actually think the gentlemen above looks a little big on the bike so I'm going to stick with the large. Especially since im in flat texas. 5 10 sucks for sizing
    I tried the large and it felt too rangy. The more you have to reach forward, at least for me, it makes it harder to get to the back of the bike in the gnar.

  43. #93
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    Mach 6 Frame size

    Quote Originally Posted by sa68 View Post
    It also depends on what trails you ride....I ride a m6 medium and am 5 10, it is great on the bigger open trails but my old 5,7 was better on the tighter single track, I am so glad I didn't go with the large as I would have really struggled on the tighter local trails....
    I tried the large and it felt too rangy for me.

  44. #94
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    Mach 6 Frame size

    Quote Originally Posted by SDMTB'er View Post
    I tried the large and it felt too rangy for me.
    With the stock stem, yes. It's a longer reach to the bars with your Medium and 80mm stem than my Large with the 50mm.

  45. #95
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    Mach 6 Frame size

    Quote Originally Posted by tadmcmichael View Post
    With the stock stem, yes. It's a longer reach to the bars with your Medium and 80mm stem than my Large with the 50mm.
    Actually I believe Pivot is no longer selling the FSA 80mm stem as standard. The bike I tried had a shorter stem and different brand. Maybe in the 50-60mm range. I think if you are trying to setup a M6 as a mini DH bike, short stem is the way to go. But if you are more of an all around trail rider involving steep climbs as well as technical downhills the 80mm stem seems to be a good compromise. For me it also allows me to get a fairly close feel to my Mach 429 cockpit. I have my seat height and effective top tubes set exactly the same with 80mm stems on both bikes.

  46. #96
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    They aren't selling the M6 with a 80mm stem after websites (Pinkbike, Vital, Enduro, etc.) and the mags popped off about how bikes targeted at the AM/Enduro segment need short stems, wide bars, and a dropper.

    No doubt the setup works well for SDMTB'er and he's pleased with it. I personally wouldn't want to set up my M6 like I would a 100mm endurance-oriented 29er. In my eyes, that medium looks really quite small, especially given how short the M6 wheelbase is to begin with. I'd find it really hard to get my chest down, elbows out, and weight centered on that medium if I were 5'10. But again, it's not my M6.

    I'm on a large with a 50mm stem, stand at 5'11", and just want to add that these bikes with longer front centers may not feel like the bike you've loved for 5 years. I feel like the evolution in geometry may take a bit of time to adjust to but there's a reason people are moving that direction. Pivot's flavor or "long and slack" sits decidedly in the middle of the spectrum with Mondraker way the hell out there in another County, Kona a ways out, and Santa Cruz/Devinci/Others less so.

    I've been railing mine for over a year and am extremely pleased that I went with the M6.

  47. #97
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    I'm 5'10" w/31" inseam on a medium Mach 6. I love the way the bike feels and rides. My previous bike was a large and I tried the big frame/short stem thing. It was my first FS bike, coming from a bike that was a touch too small and I wanted to feel like I was in the bike blah blah blah...long story short I love the feel of the medium size frame and wouldn't have it any other way.

  48. #98
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    Mach 6 Frame size

    Quote Originally Posted by OriginalDonk View Post
    They aren't selling the M6 with a 80mm stem after websites (Pinkbike, Vital, Enduro, etc.) and the mags popped off about how bikes targeted at the AM/Enduro segment need short stems, wide bars, and a dropper.

    No doubt the setup works well for SDMTB'er and he's pleased with it. I personally wouldn't want to set up my M6 like I would a 100mm endurance-oriented 29er. In my eyes, that medium looks really quite small, especially given how short the M6 wheelbase is to begin with. I'd find it really hard to get my chest down, elbows out, and weight centered on that medium if I were 5'10. But again, it's not my M6.

    I'm on a large with a 50mm stem, stand at 5'11", and just want to add that these bikes with longer front centers may not feel like the bike you've loved for 5 years. I feel like the evolution in geometry may take a bit of time to adjust to but there's a reason people are moving that direction. Pivot's flavor or "long and slack" sits decidedly in the middle of the spectrum with Mondraker way the hell out there in another County, Kona a ways out, and Santa Cruz/Devinci/Others less so.

    I've been railing mine for over a year and am extremely pleased that I went with the M6.
    Just curious - say you had to actually XC the M6 around 20 plus miles per ride and roughly a third of that ride was steep and technical downhills, a third was average 10 percent climbing at times peeking into the mid 20s, and the other third was flat. And let's also say that you have taken lots of time to dial in your bike fit that when off by just a hair causes discomfort in the usual areas (wrists, lower back, etc). Wouldn't you want to approximate a similar fit as your XC rig that you knew helped you maintain your riding comfort for hours in all sorts of terrain? That is my mindset. That being said, the rest of the M6 geometry with the slack seat angle, the longer travel, and the smaller wheels is what makes this bike own the DH stuff.

    For example here in San Diego you will climb at least, LEAST, 1500 feet to have any sort of fun on the DH. Having a super long, slack bike with a floppy front end due to the shorter stem would get very annoying within the first 20 feet of your first 20 percent grade climb. So I am not really about chasing a mythical reach metric because VitalMtb says it is so, than fitting the bike to my specific use case and body dimensions. The reach measurement as far as I know is entirely subjective as far as what is "right." But there is a fair amount of work around proper bike fit based on knee angle, extension, position relative to pedals, etc.

  49. #99
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    I can be considered as a small built person at 5' 7" andI went with a size M on the Mach 6. Using a 50mm stem & 750mm handlebar. It fits me well. I didn't feel uncomfortable when riding it up or down. I guess if the sizing wasn't too far off (like, in my case, going for an XL or an L size), your body will eventually adapt to the new riding position. Just my own opinion. I don't ride super extreme downhill stuff. Just regular all mountain terrain which involves a fair amount of climbing as well as descending.

  50. #100
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    I decided to do a bike fit via competitive cyclist and my results came back with the below.. Results indicate I should be on a Medium Pivot. Are these on-line fit calculators pretty legit? They required a lot of measurements.

    Standover - 20.4 - 31.1 inches

    Top Tube - 23 - 23.4 inches

    Stem Length - 9.6 - 11.2 cm

    BB Saddle Position - 70.1 - 71.6 cm

    Saddle to Handlebar - 53 - 54.6 cm

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