Crank Length... wadda ya using- Mtbr.com
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  1. #1
    Ride da mOOn Moderator
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    New question here. Crank Length... wadda ya using

    So, I use mainly 175mm length...

    ... but have used 177.5s, 180s, 181s, and 185s

    The 185s on a 26er provided a lot of torque to loft the front wheel, but I think they might be too long otherwise. Seems the 180s or 181s were just about right as I'm over 6 foot tall with long legs.

    I feel steel is very stiff and have yet to find an alu. crank that can match them, no don't get me wrong I'm not a weight weenie and I'm not worried about steel vs alu. for a lightness aspect. I'm a Clyde rider so carbon is out of the question for me!

    Right now I'm riding a 29er with alu 175s, going to 180s steel soon.

    How about your set ups?...

  2. #2
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    180mm Specialized carbon for me.

  3. #3
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    I prefer 180's, and recently sold a couple nice XTR 960 setups because they were 175mm and felt funny.

    I would give 185's a shot.

  4. #4
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    175mm. I can't spin with 180's.

  5. #5
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    180, 175, 172.5 and 170.

    Though I can't imagine doing anything less that 175 offroad, sitting on a SS.

  6. #6
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    I build up a beater as my first foray into SS. I got a hands me down 170mm crank. I'm thinking of swapping the crank with my other FS bike that has a 175mm.

  7. #7
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    180 Eno's, love'em.
    "When the end of the world comes, I want to be in Cincinnati because it's always 20 years behind the times." Twain

  8. #8
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    Quote Originally Posted by umarth View Post
    180, 175, 172.5 and 170.

    Though I can't imagine doing anything less that 175 offroad, sitting on a SS.
    The cranks on my old singlespeed 26er were 170. I remember it being kinda ironic, because those are the shortest cranks I've ever used. I've got 172.5 on the road bike and 175 on the fixed gear. Now I'm running 175 on a (geared) hardtail.
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  9. #9
    Monkey Junkie
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    175's on the KM, 170's on the road bike. Prefer 175's.

  10. #10
    CB2
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    Quote Originally Posted by erik1245 View Post
    The cranks on my old singlespeed 26er were 170. I remember it being kinda ironic, because those are the shortest cranks I've ever used. I've got 172.5 on the road bike and 175 on the fixed gear. Now I'm running 175 on a (geared) hardtail.
    Me too!
    I used to have 170s on all my bikes, then a bad thing happened and I needed new cranks for my SS. A buddy had a set of 175s so I gave them a shot. At first it felt like I was a kid riding my dad's bike, but it didn't take long to get used to them.
    In the mean time I needed cranks for my fixed gear, with all the hoopla about leverage and the likes I went with 172.5s for it.
    I liked them. Liked them so much every consequent road crank I bought was in that length.
    Honestly though, I probably just liked the cranks and made some sort of association with my pleasure and the extra 2.5 mm (that's what she said!).
    It's probably all in my head.

    I went back to 170s offroad as it's easier for me to turn them over; that extra leverage doesn't do you any good if you can't get it over the top.

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  11. #11
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    180mm and the same seat on both my singlespeeds and my gearie. Works great.

  12. #12
    bike me, then beer me
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    180 cranks on a small Niner SIR9. I'm 5'9" with 32" inseam. What doesn't kill ya, only make you stronger. I love the torque.

  13. #13
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    175 on Lynskey Ridgeline (26" wheels) size medium...I'm 5'10" 32" inseam...works great!!!

  14. #14
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    175mm and I'm 6'5" on a large Jabberwocky. I feel like I get plenty of torque.

  15. #15
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    175s on my SS's (26 and 29). 170s on the fixed gears (mtb and folder). I am 6'1" with long legs. I was cursing the 175s while riding the 26 bike yesterday. Pedal strikes galore with a rigid fork (that was 90% of the problem right there-squishy fork goes back on ASAP). I can't imagine the rock traffic with 180+. I have really been enjoying the 170s on the FGMTB and will probably set the 26 and future bikes up with 170s. If you gear appropriately you don't need the leverage of long crank arms as much. You can spin a touch faster to make up for slightly lower gearing as well. The reduced pedal strikes are icing on the cake for me. After over 12 years on FG bikes, I tend to pedal through/into/at every thing in my path with faith and abandon.
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  16. #16
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    165's 6' tall.

  17. #17
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    My crank length is

    on the SS mtb and the geared road bike.
    170 on the fixed road bike.
    Ride more!

  18. #18
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    I'm 5'8" with a 30" inseam and am riding 170's! Always ran 175's in the past because that's what my bikes always came with. Even when I would upgrade the cranks I always bought 175's "just because". This year I bought a used Peace 9r off of a buddy to use as my beater and was amazed that I always felt so "engaged" when pedaling. Turns out that it happened to be spec'd with 170mm cranks! After a couple of months I decided to switch to 170's on my "A" bike. I may lose a little torque but my cadence is sooooo much smoother/faster that it more than makes up for it.

  19. #19
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    for those of you who went from 175 --> 180, did you change your gearing as a result of having more torque (ie...go to a smaller cog) ?
    crash expert, ss convert

  20. #20
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    Quote Originally Posted by bernside View Post
    for those of you who went from 175 --> 180, did you change your gearing as a result of having more torque (ie...go to a smaller cog) ?
    Yes, I always go with a harder gear when I run longer the cranks! Staying with easy gearing and longer cranks just drives me crazy. I have never been much of a spinner. Applying torque to the cranks with easy gearing is like a top fuel dragster launching, over powering the rear wheel in a spinning frenzy. I know that backing off a bit while climbing would help, but I'm not about that, I just like to try to rip the handlebars off the rig as I ride hills, and it's funny I have to use lock on grips and even then the ends wear out the quickest, while the rest of the grip is new!

    SS is a blast...
    ...that's just my take on things...

  21. #21
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    175 on all my mountain bikes. 172.5 on my CX and road bikes. Could probably do 172.5 on the MTB, but there's no XX crank in that length. Plus that extra 2.5 mm of torque is great.
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