I've installed quite a few sets of these and nobody has noticed this (yet). Basically it boils down to a slanted lug will not create as much road noise as a straight one, and they simply use one mold to make one tire, regardless of which side of the vehicle it's on. they aren't technically a directional tire, although they do appear that way. the only problems i've seen is when people mount these tires "backwards" (white letters in) and have excessive cupping due to what appears to be a smaller lug