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  1. #1
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    SB66C sizing and other SB66c questions

    Hi all,

    Apologies if this has already been asked, but I am trying to get a definitive answer to this question.

    My brother is 5' 11" tall (31.7 inch inseam) which puts him right on the borderline of a medium and/or large frame size.

    Which is the correct size for him - please provide your reasoning

    Rear axle - does any 142x12 rear axle work or must it be a particular brand?

    Headset - which version of the Cane Creek 110 headset is the correct version for this bike.

    Many thanks

  2. #2
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    Quote Originally Posted by Fury25 View Post
    Hi all,

    Apologies if this has already been asked, but I am trying to get a definitive answer to this question.

    My brother is 5' 11" tall (31.7 inch inseam) which puts him right on the borderline of a medium and/or large frame size.

    Which is the correct size for him - please provide your reasoning

    Rear axle - does any 142x12 rear axle work or must it be a particular brand?

    Headset - which version of the Cane Creek 110 headset is the correct version for this bike.

    Many thanks
    He needs to go sit on the bikes to decide for himself. No other way around it.

    Cane creeks website has a SHIS finder, which will tell you the headset for almost any bike. For the 66, you need 44/56.

  3. #3
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    I am same size as your brother. I ride the medium. To me it feels perfect. To others it may feel small. The large felt too big for me. The terrain you ride will also determine sizing. I ride mostly rocky tech, so I like a flickier feeling bike.
    Hope this helps.
    Lynn Woods
    JRA cycles

  4. #4
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    I'm the same height and ride a large with a 50mm stem. With a 70mm stem it felt too long. I have a 32" inseam and have to jack the seat post way up to get the leg extension I want. I think you would be happy with a large or medium.

  5. #5
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    Sizing is really hard and is 100% personal. You have a guy above saying he is 5'11" and loves his Medium, but I'm 5'9" and riding a Large 95 which feels good to me. I had a Medium 66 and it felt small.

    Yeti builds them big - I did a ton of measurement comparison between my Medium 66, Large 95 and a Large Giant Reign. The Medium 66 is almost identical in many aspects, to my Large Reign, and all three were pretty close in the primary dimensions.

    With my 95, I have to run the stem pretty low and my saddle is about level with the stem, but it feels good. I want room to move and the reach, to me, is good.

  6. #6
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    I'm 5'8" , 30" inseam and ride a medium. I like it.

  7. #7
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    Really wanting to hear some rider heights, frame sizes, and stem combos. I can get a killer deal on a sb66c but it's a medium and I am 5'5" so I'm afraid it's going to be too big. Wondering if a 50mm stem would make it just right for me. I tried a medium nomad with a 50mm stem and it felt too small.

  8. #8
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    I'm 5'10" and have a Medium SB66C and love it. I used the stock stem for a little while (70mm I think) and that was ok. I switched to a 50mm stem and it feels great!
    A large SB66C would have definitely be too big for me.

  9. #9
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    As MT77 says, he has to try one himself, I am also the same size as your brother and ride a large. The medium felt way too small for me. Scarsandtears is also the same size and feels the opposite and we ride the same exact terrain. So there is no way around actually sitting on and pedaling the bike if he wants to get the right size for himself.

  10. #10
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    Quote Originally Posted by The_Turkey View Post
    Really wanting to hear some rider heights, frame sizes, and stem combos. I can get a killer deal on a sb66c but it's a medium and I am 5'5" so I'm afraid it's going to be too big. Wondering if a 50mm stem would make it just right for me. I tried a medium nomad with a 50mm stem and it felt too small.
    A medium will be too big for you. I'm 5'9.5" on a medium with a 50mm stem and it's perfect.

  11. #11
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    Quote Originally Posted by Dogboy View Post
    A medium will be too big for you. I'm 5'9.5" on a medium with a 50mm stem and it's perfect.
    Yeah I figured.
    I'm thinking of getting it anyways $3000 for a warrantied front triangle the full xt build with k coated suspension xtr+ rear mech
    RS dropper race face next sl crankset. Seems too good to pass up also I cannot find a small frame sb66c.

  12. #12
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    Quote Originally Posted by The_Turkey View Post
    Yeah I figured.
    I'm thinking of getting it anyways
    Don't do it. I'm 5'9" and I would NOT want to be any shorter on a medium. It's a big bike.

    Yeti Cycles SB-66 Carbon | Competitive Cyclist

  13. #13
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    Quote Originally Posted by The_Turkey View Post
    Yeah I figured.
    I'm thinking of getting it anyways $3000 for a warrantied front triangle the full xt build with k coated suspension xtr+ rear mech
    RS dropper race face next sl crankset. Seems too good to pass up also I cannot find a small frame sb66c.
    That's a good deal. Do it. If u decide its too big, you will probably be able to sell the frame for a good price and build a small

  14. #14
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    You will need the Shimano 12x142 axle

  15. #15
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    Are you only looking at complete bikes? Because there are small frames out there.

  16. #16
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    Also, there have been small 66c Enduro builds on ChainLove for $3k. Not as nice of a build of the one you are looking at, but it is a small frame...
    use SACalerts.com to get a text or email when it comes around

  17. #17
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    Quote Originally Posted by Dogboy View Post
    Are you only looking at complete bikes? Because there are small frames out there.

    if I can't get a complete I will just go for another bike. I might ask if jenson or competitive cyclist can swap out an XL frame xt build complete for one of the smalls they have

  18. #18
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    Backcountry has plenty of SB66 Carbon Race complete bikes. They're $3,999 with a $250 credit. I just checked they have the grey and the turquoise. They have the Shadow Plus rear mech, 2x10, Havoc Carbon bars, And it's all XT. I just picked up an XL.

  19. #19
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    Quote Originally Posted by Crash-VR View Post
    Backcountry has plenty of SB66 Carbon Race complete bikes. They're $3,999 with a $250 credit. I just checked they have the grey and the turquoise. They have the Shadow Plus rear mech, 2x10, Havoc Carbon bars, And it's all XT. I just picked up an XL.

    Thanks! hopefully they'll still have some smalls come the first of February!

    Also thanks to everyone for the input I really appreciate it!!

  20. #20
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    Right now they have 6 grey and 4 turquoise. I think theres a pretty good chance they'll still have them in a week. Especially given the time of year.

  21. #21
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    If backcountry will swap the fox fork for a pike for around the same price, should I get them to swap it?

  22. #22
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    yes

  23. #23
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    Thank you guys for answering my questions.. one more, will the carbon or aluminum version be better for longevity? considering al because it's cheaper and jensonusa is willing to work with me to get an Aluminum one built up for around $2600 with a build similar to the enduro build. if i go that route i can prolly get a pike fork

  24. #24
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    Quote Originally Posted by The_Turkey View Post
    will the carbon or aluminum version be better for longevity?
    No real difference. Anymore, catastrophically damaging the frame is going to require replacement parts one way or the other. You're not really going to save much trying to get either frame repaired, vs just getting a replacement triangle from Yeti.

    I bought the aluminum comp built on a whim. One ride, and I knew that I was going to be keeping that bike for a long time - so I bought a carbon frame to swap all the bits on to.

    The ONLY reason i did that was I knew the 1.5lb difference would bug me every time I had to pedal it up a long hill.

    If you don't mind the weight penalty, there is no reason to go for the carbon...

  25. #25
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    Quote Originally Posted by forkboy View Post
    No real difference. Anymore, catastrophically damaging the frame is going to require replacement parts one way or the other. You're not really going to save much trying to get either frame repaired, vs just getting a replacement triangle from Yeti.

    I bought the aluminum comp built on a whim. One ride, and I knew that I was going to be keeping that bike for a long time - so I bought a carbon frame to swap all the bits on to.

    The ONLY reason i did that was I knew the 1.5lb difference would bug me every time I had to pedal it up a long hill.

    If you don't mind the weight penalty, there is no reason to go for the carbon...
    To add:

    I have a 95a and don't regret not going carbon one bit (yet). But also, to be fair, I've never ridden a 95c, so I do not have a comparison to weigh in on.

    But I have my 95 alloy down to 29.2 pounds (without drop post) and I'm pretty satisfied with that. My next bike will probably be carbon, but for this year, I'm very satisfied with aluminum, thus far.

  26. #26
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    Quote Originally Posted by forkboy View Post
    No real difference. Anymore, catastrophically damaging the frame is going to require replacement parts one way or the other. You're not really going to save much trying to get either frame repaired, vs just getting a replacement triangle from Yeti.
    Agreed.

  27. #27
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    SB66C sizing and other SB66c questions

    bump on this... at 5'5" / 30 inseam. Am I too small to ride a small? I haven't been on mtb for quite some time so no reference to compare... been thinking abou a bike for some time and the killer deals going on right now are tempting me!

    thinking small/shortish stem

  28. #28
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    Yeti says 5'3"-5'7" so I don't see why not. I'm 5'6" 30" inseam. Currently running 70mm stem and will be going to 60mm soon. So I'd imagine room for you to go to a smaller stem if you felt the need.

  29. #29
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    I'm 5'6" with a 29" inseam on a small now. Feels pretty good although I am going to swap the 70mm stem for a 50mm one.

  30. #30
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    I'm 5'8" with 29 inseam and riding a small with a 70mm stem. The medium with the 24.2 TT just felt to big with a small stem. Fit is great for my type of riding. Living in CO and travelling to UT and WY to ride. Bike was amazing last week in Fruita/Moab area. YMMV though.
    Proud Tribe member since 1992 - looking for better singletrack to be ridden year round

  31. #31
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    just pulled the trigger on a small frame build from bc.com... cost was $3600 (XT build with XTR rear der, crankset and shifters) already counting on my activejunky cash back!

    Thanks to the new wheels size hype I was able to afford a great bike (probably overkill for me) :-)

  32. #32
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    Gratz bro I did the same a month ago with the sram build.

  33. #33
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    SB66C sizing and other SB66c questions

    Quote Originally Posted by The_Turkey View Post
    I'm 5'6" with a 29" inseam on a small now. Feels pretty good although I am going to swap the 70mm stem for a 50mm one.
    which stem did you get? mine is coming with a 70mm ea70 but cc wanted $80 to replace by a thomson x4 50mm and I thought it was too much...but I need to get a 50mm!

  34. #34
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    A thomson stem

  35. #35
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    So I've combed the interweb on this issue of sizing taking note of heights and sizes that folks are reporting (as well as stem lengths used) on the 66. As I am about 5'8.5" I am mostly concerned with the M vs S size. Within the medium, you see a bell curve where most people btw 5'9"-5'10" ride a medium. As you approach 5'8" and 5'11", you see guys floating across to either the smaller size or larger, respectively. My sample size is 38 FWIW. these aren't ground breaking statistics, but may suggest that if you follow yeti's rec you'll be fine. IMO, If on the fence, sizing up or down is dependent on personal pref and riding style. While the smaller May be more "agile", the larger will be more "stable." And of course, there are other body proportions such as inseam and torso that need to be considered. BTW, normal inseam is about 45% of overall height (inseam cm/ht cm).
    The more interesting theory is why the longer TT for a given size. While Yeti would be wise to explain this, go to Mondraker's website who has taken this to the extreme (longer TTs and like 10mm stems). This set up is supposed to center you on the bike better providing more stability perhaps making any type of riding better. Thoughts?
    I've also become a bigger fan of sizing a bike in terms of reach and stack and although yeti does not list these values, they are out there. Supposedly, the stack is the same for the small and medium 66 while the reach changes. Likewise for the large and XL... stack is same and reach gets longer btw the two. This doesn't make sense as you would think the size of a bike would increase those two lengths in a linear fashion. Look at Cerevelo's explanation.

  36. #36
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    http://www.mondraker.com/13/imagenes...try_PDF_en.pdf
    Bike Geometry, Sizing and Fit - Cervélo

    Mondraker's take is very informative and cerevelo's theory makes sense. Taken together is not going to tell you which size to get, but may help

  37. #37
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    Quote Originally Posted by ugly View Post
    The more interesting theory is why the longer TT for a given size. While Yeti would be wise to explain this, go to Mondraker's website who has taken this to the extreme (longer TTs and like 10mm stems). This set up is supposed to center you on the bike better providing more stability perhaps making any type of riding better. Thoughts?
    I've also become a bigger fan of sizing a bike in terms of reach and stack and although yeti does not list these values, they are out there. Supposedly, the stack is the same for the small and medium 66 while the reach changes. Likewise for the large and XL... stack is same and reach gets longer btw the two. This doesn't make sense as you would think the size of a bike would increase those two lengths in a linear fashion. Look at Cerevelo's explanation.
    As you point out, Mondraker has taken this theory to the extreme. And they've actually backed away from it slightly with their latest models. I would image it's due to not being able to weight the front wheel properly with a zero reach stem. I think Yeti strikes pretty near the perfect balance with the geometry built around a short, but not crazy short stem. And you see more companies going this way every day. Kona with the Process, Santa Cruz with the new Nomad, YT with the Capra, and the list goes on. These aren't bikes where using a short stem is a compromise or that you have to "up size" to make it work, but they are specifically built for it. Yeti was definitely on the forefront of the movement. As far as sizing/fit goes, at 5'9" the medium with a 50mm stem is pretty much perfect. No way I would size down and going up to a large with a 35mm stem might work but I wouldn't want the extra HT or ST length. The Reach and Stack numbers are on the Yeti website - check the regular SB66 as it has been updated more recently. The Stack on the SM/MD is the same due to the HT length being the same, though the Stack grows on the LG and XL because the HT gets longer.

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