> I think the general rule of thumb for mountain bike tread patterns is
> that the "V" should point in the direction of rotation for the front
> tire, but opposite the direction of rotation for the rear tire (as
> evidenced by treads on tractors). Rear tires, however, typically have a
> "ladder" tread rather than a "V" tread.
Tractor treads are intended to dig but cleanse themselves by pushing
soil to the side as they 'spin' in soft terrain. This occurs only if
the chevrons of the tread slide pointed end first. Therefore, I think
you have the directional notation reversed. However, all this does
not effect bicycles because they do not dig in wheel slip mode as a
tractor. This analogy is as out of place as the acceleration of
rotating mass in wheels, because on a bicycle there is no net long
term acceleration. Likewise there is no long term wheel slip as on a
farm tractor. Bicycles don't sit in place and dig.