There is more to consider than leg length when selecting a crank size. Foot
length is also a factor in how much a knee has to bend when pedaling. A
very long leg usually has a long foot and a short leg a short foot.
Assuming the ankle will flex the same on both, at the top and bottom of the
stroke, a long leg will go lower and higher by quite a bit, depending on the
relative foot size. I think that might explain the reason that cranks
aren't quite proportional to just the length of the leg.
Another related factor is the pedal technique or ankle flexing of each
individual for the same reasons. I ankle quite a bit and ride with 170 mm
cranks. I tried 175s and found that it just felt awkward. There is really
no mechanical advantage since the better leverage is countered by the need
to move the foot further at a slower cadence and higher gear.
Too bad it's not that easy to just try out a different crank length for a
week or so to see how it feels. If you feel that your pedal stroke is
cramped, go longer. If you feel that you are making too big a circle go
shorter.
Bob Simpson
-----Original Message-----
From: Annette Bradfield [mailto:[EMAIL PROTECTED]]
Sent: Thursday, June 28, 2001 6:41 AM
To: [EMAIL PROTECTED]
Subject: [obc] Crank Lengths
Paul "always bought the 'length-don't-matter' argument" wrote:
>are you going on the assumption "because I AM smaller, everything SHOULD be
>smaller, including the cranks"?
I really don't know much about the technical aspect. I just find it more
comfortable to spin faster when I don't have to pedal in such a large
circumference.
I will refrain from commenting on the 'length-don't-matter' aspect...
Annette
On Jun 27, [EMAIL PROTECTED] wrote:
>
> http://www.nettally.com/palmk/crankset.html
>
> http://www.velonews.com/tech/rev/crank.html
>
> Just to add some feul to a fire I'd missed earlier. ;-)
>
> --
> David Bilenkey
>
> Bilenkey Industrial Design
> [EMAIL PROTECTED]
>
>
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