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touring crank length vs road crank length?

Old 04-26-05, 09:01 AM
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touring crank length vs road crank length?

Should they be the same or should one be shorter than the other?


Specifics: I'm currently riding 170s, but test rode a bike with 175 and noticed a positive difference. Then I got pro-measured at another shop and the guy independently said I should be on 175s. I'm thinking of replacing the BB and cranks on my current bike and thought, "well, I'm gonna get a new bike sooner or later, maybe I should go with touring cranks for my current bike?" 28-27 should be low enough to get a light-touring setup over the mountain passes.

So there ya go

Crank length same or different depending upon application?

TIA!
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Old 04-26-05, 09:47 AM
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Originally Posted by LordOpie
Should they be the same or should one be shorter than the other?


Specifics: I'm currently riding 170s, but test rode a bike with 175 and noticed a positive difference.
TIA!
I'd be curious to hear more detail about the "positive difference". The reason I ask is that I've been riding a Miyata touring bike since 1988, and it has 170 cranks. Someone put the bug in my ear that the 170's seemed short for me, and I might try going to 175's.

Is the change in mechanical advantage really noticable? I have lots of hills around here (Northern California), and would love to squeeze out more efficiency on hill climbs.

John D.
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Old 04-26-05, 09:55 AM
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I did about an hour test ride on my typical loop near my house, a reservoir, so I didn't get to test in the mountains. I noticed that i was moving faster, generating power more easily, legs/knees just felt better.

How long is your inseam? Mine's 88cm / 34.5"
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Old 04-26-05, 10:37 AM
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Originally Posted by LordOpie
How long is your inseam? Mine's 88cm / 34.5"
I'm about 5'11" tall, with an inseam of about 30". Is there a some sort of standard calculation for guestimating proper crank length?

John D.
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Old 04-26-05, 10:42 AM
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is 30" what the inseam is on your pants -or- all the way up to the pelvic bone? Could be as much as a 2-3" difference.

The proper way -- from what I understand for measuring -- relates directly to your femur, but that seems really hard to do, so some people use the inseam and multiple it by 20-22%, depending on various other factors.
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Old 04-26-05, 11:18 AM
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Originally Posted by LordOpie
is 30" what the inseam is on your pants -or- all the way up to the pelvic bone? Could be as much as a 2-3" difference.

The proper way -- from what I understand for measuring -- relates directly to your femur, but that seems really hard to do, so some people use the inseam and multiple it by 20-22%, depending on various other factors.
That is the inseam of my pants. 30*20% = 6, so using your example my inseam would = 36 (or 36.6, using 22%). Geez, I'm getting taller!

John D.
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