Quote Originally Posted by goldfinch View Post
I assume that it is critical only if the tires are marked as having a tire direction? My somewhat aggressive tires on my hybrid are not marked with a direction at all.
Yes, aggressive tread is not necessarily directional. However, MTB tread that has Vs or crescents going down the spine of the tire can roll faster in one direction but give more control in another. At least, that the way I think about it. The tires definitely behave differently depending on how they are mounted. There are also tires which are exactly the same tread but meant to be mounted differently depending on whether they are used on the front or back wheel.