What length cranks?

Especially for light weight issues concerning cyclocross / touring bikes & parts.

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Lorcatronik
Posts: 5
Joined: Fri Jun 03, 2011 4:10 am

by Lorcatronik

I'm ordering my first cross bike soon and can choose the length of crank. I'm 5'7 with a relatively short inseam and longer torso. I'm thinking a shorter would be the way to go (170 mm) as the bike has a lower bottom bracket, but wanted to get some input from those who have raced cross before. My current road bike uses a 172.5 mm.

rockdude
Posts: 216
Joined: Fri Nov 21, 2008 3:23 pm
Location: Boulder, Colorado

by rockdude

I would stick with the size you have on your road bike. Bottom line, it probably doesn't matter but I think I can feel the difference when change crank arm length. I have an 8cm BB drop on my cross bike and very rarely do I have a problems but I do notice the better handling all the time.
2 Serotta's, 1 Spectrum, 1 Van Dessel, 1 Parlee & 1 Carl Strong, & 1 Titus.

by Weenie


nitropowered
Posts: 1146
Joined: Fri Jul 17, 2009 4:10 am

by nitropowered

My road and cross bikes have the same length.

dee
Posts: 333
Joined: Sun Dec 28, 2008 11:42 pm

by dee

Go shorter.

vcnz
Posts: 276
Joined: Thu Jan 11, 2007 3:48 pm
Location: The Netherlands

by vcnz

cx races are all about acceleration, short pedal length is a bad choice

dee
Posts: 333
Joined: Sun Dec 28, 2008 11:42 pm

by dee

Exactly my point, since a shorter crank will accelerate faster it's worth a try. I'd say it may even be an advantage on some courses where ther is a lot of sharp corners.

vcnz
Posts: 276
Joined: Thu Jan 11, 2007 3:48 pm
Location: The Netherlands

by vcnz

dee wrote:Exactly my point, since a shorter crank will accelerate faster...
In my understanding this is totally wrong

Briscoelab
Posts: 1730
Joined: Thu Jan 26, 2006 6:01 pm

by Briscoelab

Just keep it the same. Honestly, a mm or two isn't going to make any difference. If you really want it different, go slightly longer.

row618
Posts: 28
Joined: Fri Oct 30, 2009 10:41 pm

by row618

A really important part of cross a lot of prople ignore is torque. When conditions are crap and traction is low it is at times better to lower the cadanece and hopefully increase the torque to achieve better grip and power application to the tirers. A shorter crank would not be as benificial for this. Stay the same or longer if you want to try it

by Weenie


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