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Longer Cranks for TTs

Old 07-07-08, 10:37 AM
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SpongeDad
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Longer Cranks for TTs

Anyone do this? I would think if you're training on your rode bike, this might create some problems.

If you do go with longer cranks, how much longer do you go?

What's the main benefit? Taking some tension off the quads at lower cadence?
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Old 07-07-08, 10:42 AM
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Why would you want to slow down your cadence?
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Old 07-07-08, 01:55 PM
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Hi,

Well, being old (at least older than pcad) the prevailing logic over the years has been that for TTs you push somewhat bigger gears than you would in a road race. Therefore, longer cranks allow for a bit more torque from your legs into the drivetrain. When I started having a separate bike for TTs back in the 1980s, I started using longer cranks -- 172.5 mm instead of 170 mm.

Does it help? Don't know but I don't think it hurts.

Unless your legs are really long or unless you train a lot on a TT bike, I would keep the crank length difference at 2.5 mm rather than 5 mm or longer.
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Old 07-07-08, 07:00 PM
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Just to muddy the waters, I read somewhere (Arnie Baker or Andy Pruitt) that shorter cranks would be more benefit in a TT. Theory being that you could apply torque faster at a lower resistance in any given gear with shorter cranks. In practice...?
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