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PostPosted: Mon Nov 12, 2007 10:21 am 
East Midlands AEC
East Midlands AEC
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Joined: Thu Oct 05, 2006 7:45 pm
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Location: Derby, UK
In real terms what do the respective lengths do? I appreciate longer = more leverage, but then how does this affect gearing etc? What length suits what style (general XC, hill climbing etc)? Does your height have any bearing i.e. longer/shorter cranks better for taller/shorter people?


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PostPosted: Mon Nov 12, 2007 10:25 am 
Retro Guru

Joined: Sun May 14, 2006 5:38 pm
Posts: 936
Location: Sussex
165 and 170 = fixie riders and short arses.

175 = 'normal' people

180 = lanky gits


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PostPosted: Mon Nov 12, 2007 10:38 am 
East Midlands AEC
East Midlands AEC
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Location: Derby, UK
Can't think I've ever seen a 180 crank unless by some boutique maker?? Or am I blind?

I'm quite tall - would it really make a substantial difference? If so how?


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PostPosted: Mon Nov 12, 2007 10:42 am 
Mr Darcy
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Joined: Wed Oct 26, 2005 8:36 pm
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Location: Bicester
180mm for longer legs, and tend to be used on SS to get more leverage.

Have 175mm MTB and 172.5mm road and buggered if I can tell the difference


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PostPosted: Mon Nov 12, 2007 10:43 am 
East Midlands AEC
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Location: Derby, UK
emperor's new clothes?


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PostPosted: Mon Nov 12, 2007 10:44 am 
Old School Grand Master
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Joined: Thu Jul 19, 2007 7:18 pm
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Location: Staffordshire
Read an interview once with a world class time trialist who reckoned the only restriction on crank length was the state of your knees and how much you value them if they are currently OK. It increases the amount the joint has to move along with I suppose torque.


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PostPosted: Mon Nov 12, 2007 10:45 am 
Retro Guru

Joined: Sun May 14, 2006 5:38 pm
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Location: Sussex
Nearly all decent chainsets are made in 170 - 180 just that 99% of MTB's are specced with 175's. XT comes in 165 - 180

More choices in top end - XTR and Dura Ace comes in 7 lengths.


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PostPosted: Mon Nov 12, 2007 10:46 am 
King of the DuckBoard
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Joined: Sun Jan 28, 2007 12:30 pm
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Didn't the likes of 'cooks bros' & Bullseye make their cranks in odd 'non' standard length. I think my Bullseyes were 176 or 177 and Cooks make a 181. If my memory serves me well


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PostPosted: Mon Nov 12, 2007 10:59 am 
Pumpy's Bear
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Location: Hereford
As above, I have 172.5, 175 and 180 cranks and really can't tell the difference. If I had to choose I guess I'd go for 175s


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PostPosted: Mon Nov 12, 2007 11:09 am 
MacRetro rider
MacRetro rider

Joined: Fri Feb 09, 2007 4:16 pm
Posts: 8660
The longer the crank the more leverage but the less comfortable to turn for the short legged. The shorter the crank the more comfortable for short legged but mechanically less efficient for long legged or so it feels to me. Short cranks however give better ground clearance off road and on if riding fixed. Ultimately its down to personal preference.

I like a 180mm crank for leverage and thus more hill climbing power if I'm riding an mtb with sufficient bottom bracket ground clearance but I prefer 165mm cranks on my fixed gear road/trail bike so as to avoid my pedals hitting the dirt when cornering. I'm 6'6" with long legs that find 180mm cranks comfortable and if I could source 185mm cranks for sensible money , I would.

Cheers


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