It's actually the other way around. Y-rated tires have the highest speed rating there is available (186mph). Z-rated tires are only quoted for being capable of greater than 149mph...how much more varies across all manufacturers. The W (168mph) and Y ratings were introduced to allow tire makers to specify more clearly what their tires are capable of. In net, the Y rating is the highest rating there is at the current time.dmc said:Only problem is the speed rating which isn't as good as some other manufacturers.. I.e. Only Y rated not Z.
That's a nice site although their speed rating info is a bit out of date since they don't list Y-rated speeds. It confirms what I wrote above...that Z is rated at "over 149mph". Again, just note that "how far over" 149mph is something only the tire manfacturer can answer, but in most all cases a Z-rated tire has not been certified at Y-rated speeds (186mph). When the Z rating came out in the early 80's, the thought of needing to worry about street tires at speeds much over 150mph was beyond comprehension for the most part.dmc said:
My initial thought on the t1r was its size avalibility. it comes in both 275 and 285, which is what i use on the dinan wheels. The ps2 is only 275. I admit i like the look of the slightly wider rear tire... Cosmetics aside, the t1r is pretty cheap!Jayson said:Has anybody looked at the contact patch of the T1R vs a PS2?
mottati said:My initial thought on the t1r was its size avalibility. it comes in both 275 and 285, which is what i use on the dinan wheels. The ps2 is only 275. I admit i like the look of the slightly wider rear tire... Cosmetics aside, the t1r is pretty cheap!
Mike
Good point Jayson, so a PS2 could potentially have more rubber on the road in a 275 vs a t1r or a ps1 in 285. I'll look back at tire rack and see if they have any data on 'rubber/void' ratios.Jayson said:Different tires in the same size though have different contact patches. So a 275 in either size I'm betting the ps2 has the greater contact patch. The tread design to move water removes rubber from the road. So think of a race tire no tread all contact, a wet tire has tread so less contact but great ability to move water.
mottati said:Good point Jayson, so a PS2 could potentially have more rubber on the road in a 275 vs a t1r or a ps1 in 285. I'll look back at tire rack and see if they have any data on 'rubber/void' ratios.
mike