Originally Posted by spensley
The main reason for fitting these was to get some more movement in the sidewall to prolong the life of the tires - I only get 10,000 on a set or rear tires and I don't drive hard, and that's well into the tread depth marker.
I just thought I'd try a larger aspect ratio and see if there's any more life.
Tread depth is the same, 11/32", I've also dropped to a VR rating so that should help a bit.
I'm not sure why you'd expect the aspect ratio or the speed rating to affect your tread life.
The relative hardness of the rubber compound should really be what matters and aspect ratio/speed rating have little if anything to do with that. Treadwear rating does...although even that has issues when comparing manufacturer to manufacturer.