Fly Ti 29er; help with sizing- Mtbr.com
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  1. #1
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    Fly Ti 29er; help with sizing

    I started looking a BD for a FS 29er but I'm sold on the Fly Ti 29er and I need your help with the size. I'm 5'11 3/4'' with a 34 1/4'' bicycle inseam.

    I currently ride a Niner EMD size large with a 18.5 inch seat tube, a 622mm top tube, 30.6 stand over and a 1114 mm wheelbase. I feel like it's a half a size too big. If it wasn't for the 16.5 seat tube on the medium would have been just right for me with it's 603 mm top tube. I ride it with a 100mm stem.

    I also have a Kona Unit size 19 with a 19 in seat tube, a 610 mm top tube, a wheelbase of 1103 mm and a 32 inch stand over. This bike fits me perfectly.

    So now we have the Fly;

    seat tube 17.5 or 19 either would work, I think I'd like 17.5 better.

    Top tube: 602 vs 622. The 17.5 is closer to my perfect 610 and a 115 stem should make it just right.

    Wheel base: 1110 vs 1121 holy crap 1121 sounds huge.

    Stand over: 29 5/8 vs 30 3/8, either would work, I like 29 5/8 better

    So I should get a 17.5 right? Am I missing something? The Fly has a 72.5 seat tube angle compared to 73 on my other two bikes. How much does this change the seat position relative to TT length?


    Just a couple more questions:

    Does anyone have the head tube measurement for the two sizes?

    How about BB shell length?

    And finally; the XO bikes both come with a FSA afterburner crank; one three speed one tow speed. Is it the same crank with different rings or is it a different crank?

    Thank you for your help!
    60; it's the new 40!

  2. #2
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    Yes get a 17.5. I'm 5-10 with 33" inseam. I might have bought a 15.5 but they were sold out. I'd like 1 1/4 more standover.

    I'm 70 years old. My riding is undoubtedly less aggressive than most Fly Ti 29 riders. I'm coming from a 17" Monocog (SS) rigid 29er. I ride mostly dirt roads and trails.

    I can't bear riding my Cannondale F500 26 HT.

    I really like this bike a lot. I have about 300 miles on it.
    Last edited by svbackstreets; 10-25-2010 at 06:09 PM.
    Redline Monocog 29er
    Moto Team Fly 29er Ti
    Trike-X
    Cannondale F500
    Rans Rocket (bent)
    Burley Spider (bent)

  3. #3
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    I'm your height with a 33" inseam and ride a L. My only "complaint" is the standover could be better but otherwise it's my favorite bike to date FYI, I built mine from the frame up and have a straight seatpost, 90mm stem and an 80mm fork.

  4. #4
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    Its a great bike. Get either size. You will be challenged by the standover a bit more on the L. I ride a L with a 35.25" cycling inseam from PB to ground...and not a lot of room but enough.
    As to reach...extrapolate from other bikes you have owned. The bike is actually a hint short for me but I didn't want the tighter standover of the XL...I am 6'1" with long arms and legs. I therefore opt for the a 130mm stem as I like to ride stretched out just a bit...with my bars about even with the saddle.
    I will say this. The Fly Ti 29er has the most supple ride of any 29er I have ridden...a fantastic value. I too built mine frame up.
    Cheers.

  5. #5
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    I see you posted in the 29er forum. If you like a shorter top tube like your Kona,
    get the 17.5" Fly for the improved standover and shorter wheelbase.
    Cheers.
    Last edited by dirtrider7; 10-29-2010 at 08:46 AM.

  6. #6
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    Your right I could ride either large or medium. I'm in Pacific Beach Ca for the weekend and there is a Gary Fisher dealer right around the corner so yesterday I checked out the Fishers and rode them around outside. As set up the large felt better in the lot and if I didn't know what I wanted I'd have chose that one, but it felt huge. The Fisher Medium is set up with a 90mm stem. If it had a 110 I think it would be just what I like.

    I plan on running the bike 1x10. Can you please measure the BB shell width. That will help me decide between XTR and X0
    60; it's the new 40!

  7. #7
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    Quote Originally Posted by Sweeney
    Your right I could ride either large or medium. I'm in Pacific Beach Ca for the weekend and there is a Gary Fisher dealer right around the corner so yesterday I checked out the Fishers and rode them around outside. As set up the large felt better in the lot and if I didn't know what I wanted I'd have chose that one, but it felt huge. The Fisher Medium is set up with a 90mm stem. If it had a 110 I think it would be just what I like.

    I plan on running the bike 1x10. Can you please measure the BB shell width. That will help me decide between XTR and X0
    The large is a big bike to be sure...but if you don't need the top tube length, the medium is better because the head tube and sta are the same.
    I through a scale on my BB for you and it measures 72mm wide...or there abouts. FWIW I run a Sram driveline on mine...but SLX triple with 1 spacer on the drive side of the BB.
    I like Shimano cranks and cassettes and chains and Sram derailleurs and shifters.
    You will enjoy the bike once you get it sorted.
    Have fun.

  8. #8
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    Thanks for the info Dirtrider. One more question; I run my Niner with an XT crank and a 28 tooth granny chainring only. Does it look like a 28 tooth granny will fit on the Fly ti 29er?
    60; it's the new 40!

  9. #9
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    Quote Originally Posted by Sweeney
    Thanks for the info Dirtrider. One more question; I run my Niner with an XT crank and a 28 tooth granny chainring only. Does it look like a 28 tooth granny will fit on the Fly ti 29er?
    I would say yes...but not an absolute certainty. My 22t granny has a lot of clearance to where the chainstay splays outward from the BB.
    FWIW I have been playing with my fit a fair amount lately. Keep in mind that reach to the bars and associated cockpit size is quite complex. Bar sweep and width matter quite a bit as well.. I am going to a 120mm stem from 130. If one lowers the bars, this is about the same as increasing stem length. A typical fit for a guy like me would likely be with a stem length of 110mm or so on a size Large but I prefer my bars up a bit higher.
    Saddle setback matters as well.
    If you are confident in your previous set up, top tube length should transfer. I could probably even ride a medium if I ran old school 2-3" of bar drop.

  10. #10
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    So..............................XTR medium it is!

    I was looking at the photo gallery and saw that they use the spacers for the bottom bracket. I can move them both to the drive side if I have to.

    Now I just have to wait for availability.
    60; it's the new 40!

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