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Crank Length - Does it make much difference..

 
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JimboP




Joined: 07 Jul 2004
Posts: 3036
Location: SW18

PostPosted: Thu Oct 07, 2004 8:33 am    Post subject: Crank Length - Does it make much difference.. Reply with quote

I'm 6'1" and ride a medium giant tcr. The size of the bike is fine but I wonder about the length of the cranks. The current ones which came with the bike are 172.5mm which I think could be a bit too short considering that I used to use 175mm on my mtb when I was racing...

Does changing the length make much difference? I guess it could come down to the whole cadence/power debate..
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redbiker




Joined: 24 May 2004
Posts: 6074

PostPosted: Thu Oct 07, 2004 11:56 am    Post subject: Reply with quote

I'm 6'2" and ride 175mm on my training bike and racing bike now. I used to train on 170mm (as that's what came with the bike) and race on 175 (as that's what I was told would suit me best).

Does it make any difference? I'm not sure, although I think I turn a slightly (about 2rpm) lower cadence with the longer cranks.

I would be interested to see some test results of power output against heart rate using different crank lengths.

Maybe when I'm bored I'll scan the internet to see if I can find anything.
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JimboP




Joined: 07 Jul 2004
Posts: 3036
Location: SW18

PostPosted: Thu Oct 07, 2004 12:28 pm    Post subject: Reply with quote

Amyzing what you can find on the internet.. A whole site devoted to crank lengths

http://www.cranklength.info/

should keep me busy for a while Very Happy
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redbiker




Joined: 24 May 2004
Posts: 6074

PostPosted: Thu Oct 07, 2004 3:17 pm    Post subject: Reply with quote

That is a great website. See you in about a week!
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Bike Science - Retul Precision Bike Fitting
BRISTOL - RICHMOND (N. YORKS) - DERBY
Cerveo - Kuota - Focus - Argon 18 - Kinesis - Legend - Parlee
www.bike-science.com
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MattH




Joined: 15 Aug 2004
Posts: 571
Location: Training, eating cake or working

PostPosted: Thu Oct 07, 2004 10:29 pm    Post subject: Reply with quote

Indeed, although a website that I bet a lot of people visit and end up disappointed by..... Very Happy Shocked Very Happy Wink
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MattH




Joined: 15 Aug 2004
Posts: 571
Location: Training, eating cake or working

PostPosted: Thu Oct 07, 2004 10:30 pm    Post subject: Reply with quote

There is probably some mileage to be had out of the topic title as well Smile
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Captain Fat




Joined: 05 Jan 2004
Posts: 4477
Location: Newcastle under Lyme, Staffordshire

PostPosted: Fri Oct 08, 2004 7:41 am    Post subject: Reply with quote

with my limited knowldge of cogs and stuff, i would have though the longer the crank the easier it is to turn, remeber doing such stuff in a exam once.

but also you have to take in the cosideration of your sadle hieght as well, as the longer your crank the strighter your leg becomes. so you will have to adjust your seat to get that slight bend back. so you change your position.

am i thinking about this to much Confused
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Paisley




Joined: 30 Mar 2004
Posts: 4212
Location: Exiled in Birmingham

PostPosted: Fri Oct 08, 2004 11:41 am    Post subject: Reply with quote

In principle you are right in that the longer crank lets you turn easier but the longer cranks also need bigger movements from the leg and make it harder to spin the legs efficiently. Like wise some shorter people have the legs raised too much ,hence waste extra energy bringing the leg back down with too long a crank

hope this makes sense
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Captain Fat




Joined: 05 Jan 2004
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Location: Newcastle under Lyme, Staffordshire

PostPosted: Fri Oct 08, 2004 1:47 pm    Post subject: Reply with quote

yea i had all that going on in y head as well but my fingers couldn't type quick enough so i gave up Very Happy
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