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  1. #1
    Senior Member xfimpg's Avatar
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    Crank length dilemma

    Howdy

    If you have 172.5mm cranks on your roadie, should you go for 170 or 175 on your mtb?

    I'm thinking 170 to promote easier spinning due to the shorter arm length.

    Anyone have any recommendations...?

    EDIT: 172.5mm for mtbs tend to be very expensive so i'm staying with standard lengths.
    Last edited by xfimpg; 03-19-10 at 10:28 PM.
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  2. #2
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    I run 170mm cranks on my 1x8. Ive had no pedal strikes since.

  3. #3
    Pint-Sized Gnar Shredder Zephyr11's Avatar
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    175 is standard. Most riders go a little longer for mountain.

  4. #4
    Single-serving poster electrik's Avatar
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    175... there is less spinning off-road and more torque needed, the extra bit of leverage helps.

  5. #5
    Fool O' crap sscyco's Avatar
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    175 is standard - last year I switched to 172.5 (after over 10 years with 175) and it was a good thing. Typically I was a masher - took every climb in my middle ring - but figured out that was just taking my knees out and not making me any faster. With the lower leverage and higher cadence I find I am a bit faster. On a DH bike 170 (mine) or even 165 are common - because of clearance and the lack of needed torque. For you I would go with stock and change later - if needed.

  6. #6
    Time for a change. stapfam's Avatar
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    Difference between 170 and 175 is 1/4". If you can tell the difference- you would have to be a Pro that needs the ultimate in bike fit.

    Road bikes- 165 for spinning and mountains- 172.5 for flat rides. Still can't tell the difference but the bikes are set up for the different uses. Mountain bikes and 170 on all. Probably because the 170's were on offer without an alternative at the same price.
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