tread rating

[IALuder]

whats the differnce between them all.

im looking at what tiures to get for my next set of rims. the tires im looking at are either H V or Z rated. but not all are the same tire. so which is better to have? for DD and SCCA?

[GT40FIED]

The letter ratings are speed ratings and indicate the maximum manufacturer's recommended speed given proper load, stability, etc. It goes like this (starting with S since most decent tires for AutoX wouldn't be lower than S):

S = 112mph
T = 118mph
U = 124mph
H = 130mph
V (and Z) = 149mph
W = 168mph
Y = 186mph

But for SCCA you should be more concerned about treadwear ratings. The lower the rating, the stickier the tire and the better it'll handle. The trade-off is that it won't last as long. For instance, the Bridgestone Potenza RE050 has a super low rating of 140AA. Super sticky...short life. By comparison, Bridgestone's all season no-frills passenger car tire has a rating of 700AB. Those'll last forever but'll be hard as a rock. I prefer something like a Kuhmo Ecsta 712. The treadwear ratings are between 280-360 (depending on size and aspect ratio) so they're good enough for a daily driver, too.

[IALuder]

thanks GT i was looking at getting the toyo T1S. theres thier rating:

V, W, Y and Z speed-rated (depending on size)
- UTQG Treadwear 280
- UTQG Traction AA
- UTQG Temperature A

would you recommend them for a DD and scca car?

[GT40FIED]

On the whole I guess I would. A UTQG of 280 is a *little* lower than I prefer, but not by much. I like running at least a UTQG of 300-320AA at least. You could always go with a dedicated set of AutoX tires like the Nitto NT555R II Extremes. I did a few laps on a borrowed set of those things and felt like I was glued to the track. Then again....they carry a UTQG of 100. What size wheels are you running? That'll be the biggest factor in what tires will work best.

[IALuder]

im looking at using my stock rims as DD and the Rotas as Auto. theyll either be 17 or 15.

[GT40FIED]

For AutoX I'd go with either Yokohama AVS Sports or Falken Azenis Sports. For the stock rims I'd go with something like a Yokohama A032R. Those things own...just not for too long.

[IALuder]

im likin my kuhmo all seaon tires. that are on my DD rims right now.

but i plan on getting a set of DD and SCCA rims for the summer time. i think the T1S ill work for what im going to be doing.

[Racing Rice]

Look at the Kuhmo V700s for racing, nice cheap tire.

Here's some info on Street legal race tires.
http://www.club4ag.com/faq%20and%20tech_pages/Tire%20Selection.htm