> If tightened sufficiently, two left threaded pedals and cranks should
> pose no problem whatsoever. By sufficiently, I mean as tight as
> The risk of stripping threads by tightening too much with even a 12
I rode -- very happily -- with a pair of 165mm left cranks on a Schwinn,
but not without problems. These were aluminum cranks, so striping did end
up being a problem, and their ultimate demise. They stripped because I
tore out the threads hopping down stairs while they were loose; they were
loose despite my best effort with a 30cm wrench.
Based on experience with these cranks and others on my mountain bike, it
seems that they vary in hardness -- with a soft aluminum alloy you may
have problems.
Another problem -- the extra length puts more torque on the spindle
(axel) when jumping, such that I sheared a spindle jumping stairs.
eric.