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 Post subject: What length cranks?
PostPosted: Wed Jul 13, 2011 12:11 am 
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Joined: Fri Jun 03, 2011 4:10 am
Posts: 5
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.


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 Post subject: Re: What length cranks?
PostPosted: Wed Jul 13, 2011 2:44 pm 
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Joined: Fri Nov 21, 2008 3:23 pm
Posts: 216
Location: Boulder, Colorado
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.

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 Post subject: Re: What length cranks?
Posted: Wed Jul 13, 2011 2:44 pm 


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 Post subject: Re: What length cranks?
PostPosted: Thu Jul 14, 2011 5:15 am 
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Joined: Fri Jul 17, 2009 4:10 am
Posts: 1146
My road and cross bikes have the same length.


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 Post subject: Re: What length cranks?
PostPosted: Thu Jul 14, 2011 3:47 pm 
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Joined: Sun Dec 28, 2008 11:42 pm
Posts: 333
Go shorter.


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 Post subject: Re: What length cranks?
PostPosted: Fri Jul 15, 2011 6:41 am 
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Joined: Thu Jan 11, 2007 3:48 pm
Posts: 276
Location: The Netherlands
cx races are all about acceleration, short pedal length is a bad choice


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 Post subject: Re: What length cranks?
PostPosted: Fri Jul 15, 2011 2:28 pm 
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Joined: Sun Dec 28, 2008 11:42 pm
Posts: 333
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.


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 Post subject: Re: What length cranks?
PostPosted: Fri Jul 15, 2011 6:04 pm 
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Joined: Thu Jan 11, 2007 3:48 pm
Posts: 276
Location: The Netherlands
dee wrote:
Exactly my point, since a shorter crank will accelerate faster...
In my understanding this is totally wrong


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 Post subject: Re: What length cranks?
PostPosted: Thu Jul 21, 2011 5:38 pm 
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Joined: Thu Jan 26, 2006 6:01 pm
Posts: 1715
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.


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 Post subject: Re: What length cranks?
PostPosted: Tue Jul 26, 2011 2:01 am 
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Joined: Fri Oct 30, 2009 10:41 pm
Posts: 28
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


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 Post subject: Re: What length cranks?
Posted: Tue Jul 26, 2011 2:01 am 


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