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Crank Length Advise

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Crank Length Advise

Old 08-20-11, 10:56 AM
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garciawork
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Crank Length Advise

Hey ya'll, building up a new bike soon, and I'm not sure if trying a new crank length would do anything for me. On my mountain bikes, I always run 175mm, and on road it has always been 172.5mm. I got a cadence monitor recently, and my cadence is almost always north of 100 (and I can't seem to slow it down comfortably). So my question is: would switching to a 175mm crank have ANY effect on this? I was thinking it may encourage me a little to spin slightly less, and also give me a tiny bit (yes, I know we are talking about a couple mm here) more torque. Am I off base? When you are only talking a couple mm does it not matter? Thanks!
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Old 08-20-11, 11:16 AM
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abstractform20
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how thick is it? what color?
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Old 08-20-11, 11:32 AM
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estabro
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I might be missing the point of the thread, but why don't you just push a bigger gear if you think your cadence is too high for whatever reason?
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Old 08-20-11, 11:36 AM
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garciawork
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Originally Posted by estabro View Post
I might be missing the point of the thread, but why don't you just push a bigger gear if you think your cadence is too high for whatever reason?
Probably an HTFU thing, but I feel like I am mashing. Thats why I thought having the (minimal) extra torque from the 175 MAY help with that. But I have no idea...
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Old 08-20-11, 12:15 PM
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dblackwood72
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Originally Posted by estabro View Post
I might be missing the point of the thread, but why don't you just push a bigger gear if you think your cadence is too high for whatever reason?
My thought exactly, sounds like your in the wrong gear.
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Old 08-20-11, 01:51 PM
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Originally Posted by dblackwood72 View Post
My thought exactly, sounds like your in the wrong gear.
Kind of sounds like it, but then again, some of us just like to spin at a higher cadence. I'm using around 100 rpm's too. If we're keeping pace doing it, I'm not sure it matters, although I also wouldn't be surprised if spinning in the 100's actually wastes energy...? Anyone have a source?
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Old 08-20-11, 10:09 PM
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There are pros who do their best spinning 100+ rpm. Maybe that's just your natural cadence. Longer cranks might make you feel better on a lower cadence, but I doubt it will be a big difference.

Oh, and advise is a verb. Advice is a noun. Just a pet peeve of mine.
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Old 08-20-11, 11:31 PM
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Juan Foote
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I think you might be letting the numbers mess with your mind. Before you had the cadence monitor it was likely the same as you are doing now, with it, right? So if you are comfortable doing it, and not bouncing around on the saddle, why mess with what is working for you?
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Old 08-21-11, 10:45 AM
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Originally Posted by abstractform20 View Post
how thick is it? what color?
isnt that a rather personal question?
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Old 08-21-11, 04:24 PM
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If you can afford to drop your saddle to accomodate the extra crank length at the bottom of the pedal stroke and have your knees come relatively higher at the top of the pedal stroke, then you will get more leverage from the crank, which may increase torque. It depends on your strength and physiology, and it may mess with your cadence climbing. I tried a longer crank when building up my new bike and reverted to the stock size, turns out that the people who design and specced the bike knew what they were doing.
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Old 08-21-11, 05:02 PM
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New cranks are an expensive way to increase your torque when you could just change gear. The only torque that matters is what the rear wheel sees.

But yes, you may find larger cranks slow your cadence down a bit if that's what you're looking for.
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