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crank length??(7 posts)

crank length??filipo23
Mar 11, 2003 10:50 AM
I'm setting up a new CXer, and I'm wondering what the consensus is on optimal crank length. I ride 175s on mTB and 172.5s on road. I have 170s on my old crosser, but that was more due to a lack of dollars coupled with a surfeit of old 170 cranks. The 170s are pretty heavy, though, so I'd like to try something new.

I have 175 Deores that I can use, but I seem to remember folks telling me shorter is better for CX.


re: crank length??laffeaux
Mar 11, 2003 11:23 AM
I ride 175s on my MTB, road and 'cross bikes. Whatever is comfortable for you is what matters.
re: crank length??triangleforge
Mar 11, 2003 2:19 PM
I ride 172.5 on the road, 170 fixed (because, like you, I've got a bunch of them hanging in the basement) and 175 on 'cross & MTB. The advice I've generally heard given to roadies starting in cyclocross is to go with the same length or slightly longer cranks. Cyclocross racing tends to emphasize more grinding than spinning -- can't say for certain, but I'd guess that my cadence in a CX race is closer to 80 rpm than the 100+ rpm that feels right in a road race.

re: crank length??Hardtail
Mar 11, 2003 3:36 PM
Agreed on the slightly longer. A bit of extra leverage to help grind through a tough mud bog is just what you need sometimes.
Me= 172.5 road, 175 CycloCross&MTB
re: crank length??atpjunkie
Mar 11, 2003 8:54 PM
running 175's on everything, except1 cx bike running 170's and I barely notice the diff.
On a 'cross bike you may inadvertantly end up w/shorter cranksGlowBoy
Mar 12, 2003 10:56 AM
Because of the standard advice to size the frame 2-3cm shorter than for a conventional road bike. That will often land you with a shorter crank than you should really have. Manufacturers really should factor this in, but I don't think they do.

I run 175s on my mountain bike, and just recently discovered my 'crosser is set up with 170s ... but if I'd bought the bike based on "road sizing" I would have ended up with 172.5 or 175. I'm going to be doing a crank upgrade soon anyway, so I'll be switching to 175.

- Dan
re: crank length??satanas
Mar 18, 2003 5:13 AM
Whatever you have will probably be fine....

I use 172.5 for all except fixed gear (170 there), and found I didn't like 175 because it interfered too much with my ability to spin.

As you seem okay with 175, you may as well use them, so long as there aren't bb height/pedal clearance issues.