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PostPosted: Thu Jul 04, 2013 4:37 pm 
Retro Guru
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Joined: Thu Feb 17, 2011 3:23 pm
Posts: 267
How is crank size determined?
Is it by bike size? leg length? height of the rider etc?

Asking because i want to get the right ones and not spend a ton of money on a wrong size.

(btw Im 175cm and looking for a set of anodized black raceface cranks with rings :) )


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PostPosted: Thu Jul 04, 2013 6:17 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8212
Location: New Forest, UK
Try here, they need to match your leg length.

See this:
http://bikedynamics.co.uk/FitGuidecranks.htm


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PostPosted: Fri Jul 05, 2013 2:28 pm 
Old School Grand Master
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Joined: Sun Sep 05, 2010 1:10 am
Posts: 4756
Location: Heathfield, East Sussex
'Bikefit' isn't really necessary on a mountain bike where you are moving around on the bike all the time...

...essential for roadies who are sat in one position pounding out the miles with relentless precision all day long though.


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PostPosted: Fri Jul 05, 2013 2:41 pm 
Old School Grand Master
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Joined: Fri Dec 10, 2010 10:40 pm
Posts: 3460
Location: The Royal Society of Insobriety
We_are_Stevo wrote:
'Bikefit' isn't really necessary on a mountain bike where you are moving around on the bike all the time...

...essential for roadies who are sat in one position pounding out the miles with relentless precision all day long though.


It's not really necessary for most roadies either, any decent bike shop should be able to get the fit pretty damn good for most people on any bike, if you are having problems or you are racing then go for it, but that is equally applicable to MTBs too.


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PostPosted: Fri Jul 05, 2013 2:42 pm 
Devout Dirtbag
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Joined: Fri May 15, 2009 2:57 pm
Posts: 105
Location: weymouth
consider ground clearance...track and fixed need to have some more clearance due to peddling around corners so does riding off road and trails to clear roots etc...bottom bracket hight also plays a part in this, I would suggest cranks longer than 165 ( 170 + ) would work for you 8)


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PostPosted: Fri Jul 05, 2013 3:50 pm 
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
Posts: 16748
Location: Yorkshire, England
Technically I should be using 180's on the MTB. Fit Calculations say so (basically ~34" actual inside leg).
My height is not a lot though.

And no you're not always moving around on a bike so go for the best fit you can get. Even then you're legs will be bent and may enjoy the extra stretch it just gives you.
I wouldn't ride with my seat to high or low just because I'm moving around ;-)
170 often come on the smaller bikes as shorter legs are the average.
175 the standard for say ~18"+ (ctt)
I wouldn't fret to much about it though


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