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  1. #1
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    Pivot Mach 429 Carbon - Size question

    Interested in your views on what size 429C I should order - S or M? Currently on a M4 Medium.
    My height is 5 foot 8.5 inches.
    Pivot say small - 5ft6 to 5ft10
    Pivot say medium - 5ft9 to 6ft1
    My main concern is the seat tube height on a small, as I run a seat height of 29inches from the centre of the bottom bracket to top of the middle of the seat.

    I will be using the bike to do everything - XC Racing, 6 hour endurance, general trail etc

    Appreciate your thought?

  2. #2
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    Look at it like this. If you ride sketchy stuff where fast and quick moves at all speeds are necessary, get the small. It will react faster.

    If you ride higher speed dirt where you are plowing downhill mostly w/o much in the way of twitchy, technical stuff, go for the medium.

    I'm 5'8.5" and I have a medium 429 (alloy). It's a little big, IMO. I went with a straight seatpost (always used laybacks on other bikes) and a slightly shorter stem to feel comfortable on this bike.

  3. #3
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    Pivot Mach 429 Carbon - Size question

    I'm 5'8.5", 170#. After test riding a small Mach 4 at my LBS, and finding it to be satisfactory, I ordered a 429C small. It is a little bigger than the Mach 4 Small. I'd agree that it is nimble, especially compared to the other 29er that I tested; Specialized Epic Marathon Carbons in Med & Lg. The Pivot is like a sports car, the Epics were like long wheelbase sedans.

  4. #4
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    I am 5'10... probably really 5'9.5" and I am riding a medium and other than a little shorter in the TT than I am used to, the bike rides nimble but its still plenty of bike to ride.. I agree above at 5'8"ish I think small would be a great fit. Also the frame / fit seem to support tall / long seatposts for you longer than average seat height

  5. #5
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    Thanks for the feedback so far.
    Looks like the small will be the best fit for what I'm after as most of our trails are tight and twisty. Maneuverability is a key ingredient and it what has probably put me off a 29er up until now.
    Seems a bit weird ordering a small. Always had mediums.....

    Do you see any issues with the seat post sticking out basically 13inches from the collar?

  6. #6
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    Pivot Mach 429 Carbon - Size question

    Well, I'm not an expert, but I feel no issues with the short seat tube. But I do know the step over height is more manageable.

  7. #7
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    Thanks for this post i too am 5'8 1/2 and 190 plus and was wondering the same question. I have always had mediums and feel weird going with a small but this is good info to consider. Thanks

  8. #8
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    I'm in the same boat, Ozi. Always had Mediums, and ordering a Small just seems wrong. But given the Pivot sizing guide, and the solid advice above, I'd wager that small is the way to go. I once had a Medium race bike that I just had to have, and it never did dial in the way I needed it to for more technical courses. Too long for steep climbs and a challenge to get over the back end on descents. Given that test riding a 429c is near to impossible in my area, I have only tried a 5.7c Medium. It was too big, just like that race bike I had.

  9. #9
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    im 5'8 3/4" using SMALL 429c with 90mm stem. friend with similar height also feels the size is just right...
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  10. #10
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    I'm 5'8 1/2" with 30 inch inseam and have a M Yeti 575 and Enduro. I demoed both the S & M 429c on long rides. Loved both, but thought S had a more comfortable reach. On the S, it was easier to stay balanced and weight the wheels. I felt more in control on the S in difficult terrain.

  11. #11
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    I just called a shop in Michigan where I will be visiting soon to rent a 429. They had initially sized me up for a medium, but then decided to put me on the small because of the way the frame sizes run. I too thought this was weird but I'd rather be on a bike that's a bit smaller than a bit bigger.

    For reference, I'm about 5'8, 160 lbs, medium build.

    I'll follow up in this thread if I find that the small isn't big enough.

  12. #12
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    IMO you'll likely be best fit on a small. I'm 6'0" and am very comfy on a medium.
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  13. #13
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    I read this thread 30 times when ordering my new 429c and went back and forth over and over regarding small or medium. I just couldn't get my head around being on a small bike at 5'9" on the nose. I test rode the Medium, loved it, but did think it felt a bit big for me so I went ahead and ordered Small.

    I've messed around with the fit some but am now super dialed with an 80mm stem and a dropper post on the Small. I have about 500 miles on it in everything from XC races to Shuttles. It's pretty whippable for a 29er and fast in techy stuff but still climbs insanely well. Seriously, the bike is an insane climber whether on fireroads, pavement or techy single track. I was on a Mach 4 previously (medium) which was a pretty good climber too but the 429 is in its own league.

    So - for anyone else out there going through same machinations 5'9" and Small works well.
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  14. #14
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    I'm 5'10 and went with medium, the frame has long top tube at 24 inches. I have long upper body, the bike fits like a glove. The best bike I have ever owned, just sold my 2013 Rocky Mountain 999 RSL Element. The pivot is heavier buy you do not feel it because of how stiff the frame is compared to the Rocky. Everybody I ride with now says I'm 20% faster on the Pivot, it's that good!!

  15. #15
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    I was in your same boat and went with a Medium and happy I did. I am 5'9 with my shoes on and went with a 70mm stem and fits me like a glove.
    Attached Thumbnails Attached Thumbnails Pivot Mach 429 Carbon - Size question-dsc03711.jpg  

    2014 Pivot 429c

  16. #16
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    Nice looking bike !! That a loaded stem? This waiting for my Green frame to arrive, all Enve stem, Bars, seat post, XTR brakes with Hope rotors. X01 drive trail with xx1 crank and Bontrager Evoke carbon saddle. Light Bicycles 30mm rims, Hadley hubs with Sapim Laser spokes. Should be around 25lbs.
    I'm been riding a demo 429 carbon now for a 3.5 weeks my shop is really cool, I said I could not ride anything else after riding the Pivot. Can't wait to get my frame on Wednesday, I post some picts!!

  17. #17
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    Yes that is a loaded stem and rims. I asked for the xtr brakes but my shop could not get them but had the xt in stock and I was tired of waiting would have saved a little weight plus i liked the look a little better. Lets just say having the shop do a custom build for me was a pain in the butt.
    2014 Pivot 429c

  18. #18
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    I am your size and on a small. I think a medium would be to big.

  19. #19
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    Quote Originally Posted by spartacuslv View Post
    I am your size and on a small. I think a medium would be to big.
    My pivot dealer recommended size medium for me and i was able to demo a bike(4 weeks) to verify it would not be too big prior to ordering it. I am an obsessive type and was measuring all my deminsions for weeks trying to figure out what size frame to get. My conclusion was i would be happy with either size.
    Last edited by Bmann_mtb; 07-07-2014 at 04:46 AM.
    2014 Pivot 429c

  20. #20
    74 & 29 pilot
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    It's interesting how everybody has a different preference on how they like their bike to fit. I'm 6' with a 33 inch inseam and I ride a medium with a 50mm stem. I've been riding it since November and with a 70mm stem and just swapped out to the 50 about 5 weeks ago. I love the fit and so glad I didn't do the large.
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  21. #21
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    Frame is in!!

    Frame just came in!! Now the fun starts!! Check it out, with BB installed and headset cups frame is 6.43 lbs not light. Will see what the build will come to.
    Attached Thumbnails Attached Thumbnails Pivot Mach 429 Carbon - Size question-p1060586.jpg  

    Pivot Mach 429 Carbon - Size question-p1060577.jpg  

    Pivot Mach 429 Carbon - Size question-p1060585.jpg  


  22. #22
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    Thats a cool combo.
    2014 Pivot 429c

  23. #23
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    Love that Green. That's my next bike. Still on the fence on size. Have a medium Mach 5.7c with a 90mm stem. Stem is too long and thinking 70mm or 60mm would be better. TT on the small 429c and the medium 5.7c are very close, so still thinking small...

    Anyone have a 5.7c and 429c that could compare?

  24. #24
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    I don't have a 5.7 but came off a medium Mach4 before getting a small 429c. I am 5'9" on the nose, barefoot. I love the small but I am pretty sure I would have been good on the medium too. I rode both before I made decision and went with small cause it felt a bit whippier to me and I intended for it to be more trail bike and less XC race rig. I did feel like I lost some of the Mac Truck, bowl over anything in my way, feeling the medium gave me on the small but I got more of whippiness I was after.

    BTW I have a Medium Les 29er that I love and in hardtail on a bike that is just designed to climb fast/race I think Medium is right call. Like someone on this thread said before, I think at 5'9" both both small and medium work great on 429c. It's just personal preference and what you are using bike for.
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  25. #25
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    I'm the same size, to me it comes down to where you want to be on the bike. Small puts me at 90mm stem, I would guess that a Medium (with a 1" longer TT) would put me at about a 65mm. With the small I'm more over the front wheel, which aids in steep climbing. With a Medium you'd probably feel a little lighter in the front end, but maybe a better descender. As etuck said, the smaller size will get you a whippier feel, the medium a little more point and shoot.

  26. #26
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    Totally agree with that. On the small the seat dropper is really important. I also have my seat a bit further back on rails than is recommended to enable me to put an 80mm stem and not the 100 it came with. It took a while to get the fit dialed but when I did I was stoked!

    Such killer bikes.
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  27. #27
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    Bike is done Med. fits perfect for me 5'10. 25.4 lbs. The grips got to go, going back to Ergon grips. I love this bike!!
    Attached Thumbnails Attached Thumbnails Pivot Mach 429 Carbon - Size question-p1060595.jpg  

    Pivot Mach 429 Carbon - Size question-p1060602.jpg  

    Pivot Mach 429 Carbon - Size question-p1060599.jpg  


  28. #28
    74 & 29 pilot
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    Looks good! Are you running a 32 fork? My med weighs just shy of 2 lbs heavier with a 34 and 150mm dropper. The back tire looks backwards, but maybe it's one of those opposite rotation on the rear things. Just seems like it would brake better with the straight edge of the center knobs instead of the beveled edge.
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  29. #29
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    The tire has arrow for the rear, so it is on correct. 32 Fox and all the Enve stuff is light. The seat weight 150g. The tire are not the best for summer so will go with Bontrager 29-3 Team Issue that was on the Demo bike. I love those tires. The bike in person is stunning!!

  30. #30
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    Quote Originally Posted by etuck View Post
    I don't have a 5.7 but came off a medium Mach4 before getting a small 429c. I am 5'9" on the nose, barefoot. I love the small but I am pretty sure I would have been good on the medium too. I rode both before I made decision and went with small cause it felt a bit whippier to me and I intended for it to be more trail bike and less XC race rig. I did feel like I lost some of the Mac Truck, bowl over anything in my way, feeling the medium gave me on the small but I got more of whippiness I was after.

    BTW I have a Medium Les 29er that I love and in hardtail on a bike that is just designed to climb fast/race I think Medium is right call. Like someone on this thread said before, I think at 5'9" both both small and medium work great on 429c. It's just personal preference and what you are using bike for.
    Your explination was what i was trying to say. Mac Truck over all the roots and rocks I have to plow through. I do think I could have lost a little whippiness but sure made up in the sections that I was bogged down in the roots sections. What I do know for a fact is that I can get to point A to piont B much faster now.
    2014 Pivot 429c

  31. #31
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    Can I dive into this rather than making a new thread, please?

    I'm strongly thinking of selling my Yeti SB 95 in favor of a Mach 429 Carbon after getting a close look at a friend's new one recently (the fit and finish is really impressive, and after hearing their thoughts on it).

    In general, why is Pivot's sizing recommendations so unusual? I'm 5'9" and usually sit right between a Medium or Large for most manufactures (for the Yeti I have, I'm supposed to be on a Medium, but I just prefer bigger-feeling bikes and went with a Large).

    But according to Pivot's sizing chart, I'm on the LOW end of a Medium! I rode my friend's new Medium and it feels good, albeit small. Everything was setup pretty neutral and with a 70mm stem, but I will run a 50mm for handling.

    Just wondering why their size spec is so different than most. I'll spend more time on my buddy's Medium before deciding, but I can't imagine someone nearing 6' riding a Medium.

  32. #32
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    The more you ride it the more you will buy it. The med. has 24 inch top tube, I'm 5'10 and my med. fits perfect!! Your right about the fit and finish, my green is so nice everyone loves it. The frame while not the lightest it is the stiffest of any 29er FS and it was designed that way. This bike I feel can take any where on East Coast and be happy knowing I have a Pivot Mach 429 C under me!!

  33. #33
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    Quote Originally Posted by dgw7000 View Post
    The more you ride it the more you will buy it. The med. has 24 inch top tube, I'm 5'10 and my med. fits perfect!! Your right about the fit and finish, my green is so nice everyone loves it. The frame while not the lightest it is the stiffest of any 29er FS and it was designed that way. This bike I feel can take any where on East Coast and be happy knowing I have a Pivot Mach 429 C under me!!
    I haven't looked closely at their geometry yet to compare to my Yeti; I'm assuming just as you said, their TT length is long, etc.

    I've gone through a major learning exercise lately and have witnessed what a stiff and light chassis does for you on the trail (a buddy recently bought an Epic and his times just totally dropped drastically, then he bought his wife this Pivot and she experienced the same - I don't care for the Epic, but the Mach 429 has always been on my radar).

    With that said, what does your bike weigh?

  34. #34
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    25.4, but all expensive parts. I thought about the Epic and tested carbon Epic for 2 days, it was fast but more of XC race bike where the 429C can do it all. I have much more confidence on the Pivot.

  35. #35
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    It's not that light. Mine fully built with XTR and the 120 fox on front is still in the 28 pound range. I just put carbon wheels on and non UST tires, but haven't weighed it since. Maybe 26-27 range, but probably a bit more.
    Previously known as mttamrnr.

  36. #36
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    Pivot Mach 429 Carbon - Size question

    Besides TT you also need to look at reach. A medium 429c has a slightly shorter reach than your yeti


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  37. #37
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    Quote Originally Posted by etuck View Post
    It's not that light. Mine fully built with XTR and the 120 fox on front is still in the 28 pound range. I just put carbon wheels on and non UST tires, but haven't weighed it since. Maybe 26-27 range, but probably a bit more.
    My friend's Medium is around 27 WITH a Reverb and really heavy platform pedals. I'll throw it on the scale myself to verify. If I'm going to bother with selling my Yeti and going with something else, I want it in the 26 pound range, max.

  38. #38
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    Not sure why your worried about how 6' people are riding a medium, but if that is what you've been testing and you feel good on it, then maybe that is what you should go with. You could look for a demo and try both a large and a small for comparison. The frame is not the lightest in it's range, but the stiffness is well worth the weight and makes it possible to utilize it well beyond the XC duties.

    My medium weighs 27lbs 10oz running 1x10, XTR, 775mm carbon bar, Roval control carbon whls(1560g), a dropper post and a Fox 34.
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  39. #39
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    Are you running Bontrager 29-3 Team Issue 29x2.30 tires, this tire was on the Demo bike and I loved them!!

  40. #40
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    Quote Originally Posted by MTB Pilot View Post
    Not sure why your worried about how 6' people are riding a medium, but if that is what you've been testing and you feel good on it, then maybe that is what you should go with. You could look for a demo and try both a large and a small for comparison. The frame is not the lightest in it's range, but the stiffness is well worth the weight and makes it possible to utilize it well beyond the XC duties.

    My medium weighs 27lbs 10oz running 1x10, XTR, 775mm carbon bar, Roval control carbon whls(1560g), a dropper post and a Fox 34.
    It's simple. If I am 5'9" and am at the low end of what Pivot suggests for a Medium (5'9" to 6'1"), yet the bike feels small to me, then maybe I am looking at bike setup all wrong. Like I said, I can't imagine someone 6' riding a Medium. I don't care if someone 6' rides one, but again, maybe my setup and style is not as it should be.

    That's all.

    I'll put my bars and stem on my friend's Medium sometime (they just bought it and might be selling it already - so I may buy that one).

  41. #41
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    So, I'm 5'8", 30" inseam w/o clothes/shoes and I ride a medium 5.7c. Currently a 90mm stem is on there, and plan to drop it to a 70mm stem. According to Pivot's site, a Medium is too big for me on the 5.7, but other than the slightly longer stem I have, it fits well.

    Looking at the differences, not sure which direction to go in. Some measurements suggest the medium 429c like Seat Tube, and Wheel Base, while others suggest the small 429c like Top Tube, and Reach.

    ____________5.7c M ______429c M ______429c S
    Seat Tube......18.50..............18.50................ 17.00
    Top Tube.......23.20..............24.00............... .23.00
    Head Tube.......4.85................4.00............... ..4.00
    Head Angle.....67.10..............69.30................ 69.3
    Seat Angle......71.10..............71.90............... 71.90
    Chain Stay......16.85..............17.65...............1 7.65
    BB Height........13.72..............13.00............ ...13.00
    Stand Over......28.75..............29.60...............2 8.00
    Wheel Base......44.00..............44.17...............4 3.16
    Stack...............22.37..............23.96...... .........23.96
    Reach.............15.80..............16.27........ .......15.24

    Wondering which measurements have a larger bearing on how if will fit, and how the bike will handle. Like it was said already, small will be more wippy, medium more trucking over stuff, but when we're talking fractions of an inch, what stands out more?
    Last edited by Jeepnut22; 07-21-2014 at 01:11 PM. Reason: Correction...

  42. #42
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    Don't let the Pivot recommendiations scare you the medium feels like a medium. I was lucky enough to demo one for a few weeks.
    2014 Pivot 429c

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