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: sheldonbrown.comgainOpen ↗
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]
sfu.cawiredcolaOpen ↗ President, Fabrizio
Mazzoleni Fan Club