In article <[email hidden]>,
Sheldon Brown said:Ken Pisichko asked
Quoted message said:
Quoted message said:I am in the finance stage of putting together a touring bicycle. I am
6'4.5" and will eventually be about 220 lbs.
Quoted message said:What length of a crank should I consider for a touring bicycle? The
bicycle will have custom front and rear racks/pannier frames, but that
just means that I won't be using this bike for racing nor for
credit-card type touring.
Quoted message said:There's no evidence that there's any advantage to longer cranks, but for
a person your height, there's likely no harm in going to 175s.
Quoted message said:The longer cranks give more leverage and make it *slightly* easier to turn
a given gear.
Yes, but if you want easier pedaling there's no reason to stay in a
"given gear." Selecting cranks on the basis of gearing is a mistake,
you should select the gearing based on the cranks that you find most
comfortable biomechanically.
There is no known disadvantage to short cranks, but long cranks are
sometimes known to cause knee problems for certain riders.
See: http://sheldonbrown.com/gain
I'm quite interested in crank lengths. I started out on 170mm on my road
bike like everyone else (5'6", my pants are 30" inseam), but ran into
some achilles tendon issues that fought with long-standing knee issues.
Some of you get the joke already: for the achilles tendon, dropping your
seat slightly helps; for patellar tendonitis, raising it slightly helps.
My solution was to shorten the cranks and move my cleats back on my
shoe. The latter reduced ankle flex tendencies, which helps the tendons.
The shorter cranks mean less knee flexing, which is good for the knees.
I run 165mm cranks, and I do notice that sometimes there's a certain
constrained feeling to my pedaling circle. Since this is better than not
being able to ride because my ankle or knee is in pain, I accept it. I
also get some benefit in racing from the shorter cranks: less pedal
strike in corners, which means I can accelerate a bit sooner and more
confidently.
The punchline is that my mountain bike has 175mm cranks, mostly because
I can't find suitable 165mm cranks at my usual cheap prices.
As most of you know, mountain bike cranks tend to the long side. 180s
are not unheard of, and 175 is pretty common. But my thinking is that if
you can get the gearing right (I'm sure I can), short cranks will mean a
little more obstacle clearance while pedaling.
Though maybe that's a tech question for you: I want to shorten my
cranks, and my BB is shot (cartridge BB with lateral play=dead BB). The
rings are usable (5-bolt pattern), but I'll give them up if I can get a
good deal. Any suggestions for a good replacement? About the only
BB/crank I'm not very interested in is the Shimano pipe-spindle system
(I think it will be squeezed out by the Hollowtech II setup in very
short order). ISIS and square-taper would probably work okay for me.
--
Ryan Cousineau, [email hidden] http://www.sfu.ca/~rcousine/wiredcola/
President, Fabrizio Mazzoleni Fan Club