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  1. #1
    Mmmmm potatoes idcruiserman's Avatar
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    crank length, SS 29er

    I'm building a single speed 29er, and I need to choose 175 or 180mm cranks. I've read some of the discussion and understand that the longer crank may help with leverage. I have 175s on all my bikes but one, and I am leaning towards 180 for the halibut. If it matters, I'm 6'.

    I compared the pedal to ground clearance with my 26" 175mm crank K2 and this 29er, and I'll gain ~0.7" of clearance even with the longer cranks.

    Anyone running 180mm cranks and regret it?

    thx, Eric
    Idaho

  2. #2
    Generic Title ProFail's Avatar
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    Take your index finger and thumb and hold them aprt so they are about the length of a medium sized ant.



    This is the difference in length between a 175 and 180mm crank arm.
    Generic Joke

  3. #3
    Mmmmm potatoes idcruiserman's Avatar
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    Yeah, I've got a ruler . 5mm is actually a pretty large difference. I certainly notice if my seatpost is 5mm too short or tall .
    Idaho

  4. #4
    Senior Member Thor29's Avatar
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    Because ther aren't that many choices for 180mm length cranks, I run standard 175mm cranks on all of my bikes (including my single speed 29er) except my fixed gear road bike, which runs 170mm cranks for a little extra ground clearance in corners. Running longer cranks might work better, but I doubt there's that much of a difference. But anyway, I'd suggest asking this question in the MTBR 29er forum - there are likely lots of people there who have used longer cranks and have something to say about it.

  5. #5
    Mmmmm potatoes idcruiserman's Avatar
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    I didn't realize there was such a forum. I'll try there. thanks

    up the irons
    Idaho

  6. #6
    bhc
    bhc is offline
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    Everyone's experience can differ, but I found 180 was noticeable. I ride a Haro Mary SS. I really don't notice the difference spinning on the flats, but climbing is where I found it to be a plus. But then that also could be attributed to the 29" tire, as I have not ridden a 29er with a 175 crank.

  7. #7
    Senior Member deraltekluge's Avatar
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    Quote Originally Posted by idcruiserman View Post
    Yeah, I've got a ruler . 5mm is actually a pretty large difference. I certainly notice if my seatpost is 5mm too short or tall .
    Really? That's only two tenths of an inch. I don't think I'd notice.

  8. #8
    Mmmmm potatoes idcruiserman's Avatar
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    I definitely notice it on my road bikes. Maybe not so much on my MTB due to being out of the saddle more, etc.

    I ordered the 180mm cranks.
    Idaho

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