Speedrating W of stock better than Z of S03 or T1s?
Speedrating W of stock better than Z of S03 or T1s?
Speed Rating - Miles/Hour - Kilometers/Hour - Typical Use N=87 MPH, 140km/h, Spare Tires U=124 MPH, 200km/h
P=93 MPH, 150km/h H=130 MPH, 210km/h, Sport Sedans
Q=99 MPH, 160km/h, Winter, LT Tires V=149 MPH, 240km/h, Sports Cars
R=106 MPH, 170km/h, LT Tires Z=149 MPH, 240km/h and over, Sports Cars
S=112 MPH, 180km/h W=168 MPH, 270km/h, Exotic Sport Cars
T=118 MPH, 190km/h Y=186 MPH, 300km/h, Exotic Sport Cars
*Today, the Z-speed rating is the only speed rating that is still branded “within” the tire size, as in P225/50ZR16. All other speed ratings are shown in the tire’s service description.
When Z-speed rated tires were first introduced, they were thought to reflect the highest speed rating that would ever be required. Since that time the automotive industry has found it necessary to add W- and Y-speed ratings (indicated in the tire’s service description) to identify the tires that meet the needs of new vehicles that have extremely high, top speed capabilities.
Miles/Hour Kilometers/Hour
P225/50ZR16 149+ 240+
P225/50ZR16 91W 168 270
P225/50ZR16 91Y 186 300
While all Z-speed rated tires are capable of speeds of 149 mph and above, prior to the W- and Y-speed ratings were identified in the service, how far above 149 mph was not identified.
Does this mean the stock tires are better than the T1S or S03s? Or, does this mean the Zs are 149+ and probably higher than 168 or 186?
Very confusing.
P=93 MPH, 150km/h H=130 MPH, 210km/h, Sport Sedans
Q=99 MPH, 160km/h, Winter, LT Tires V=149 MPH, 240km/h, Sports Cars
R=106 MPH, 170km/h, LT Tires Z=149 MPH, 240km/h and over, Sports Cars
S=112 MPH, 180km/h W=168 MPH, 270km/h, Exotic Sport Cars
T=118 MPH, 190km/h Y=186 MPH, 300km/h, Exotic Sport Cars
*Today, the Z-speed rating is the only speed rating that is still branded “within” the tire size, as in P225/50ZR16. All other speed ratings are shown in the tire’s service description.
When Z-speed rated tires were first introduced, they were thought to reflect the highest speed rating that would ever be required. Since that time the automotive industry has found it necessary to add W- and Y-speed ratings (indicated in the tire’s service description) to identify the tires that meet the needs of new vehicles that have extremely high, top speed capabilities.
Miles/Hour Kilometers/Hour
P225/50ZR16 149+ 240+
P225/50ZR16 91W 168 270
P225/50ZR16 91Y 186 300
While all Z-speed rated tires are capable of speeds of 149 mph and above, prior to the W- and Y-speed ratings were identified in the service, how far above 149 mph was not identified.
Does this mean the stock tires are better than the T1S or S03s? Or, does this mean the Zs are 149+ and probably higher than 168 or 186?
Very confusing.
Registered User
Joined: Dec 2002
Posts: 112
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From: utah
speed ratings
I ran SO3's last season in Open Road Racing events and was given a 186 tire tech speed, I ran Michelin's the previous 2 seasons and was allowed 168 on them.
The SO3 had a W rating and feels great at speeds in the 160-175 MPH area.
John
The SO3 had a W rating and feels great at speeds in the 160-175 MPH area.
John
Registered User
Joined: Nov 2002
Posts: 1,038
Likes: 0
From: Winfield, IL
No it doesn't mean that. Speed rating is not the only measure of a tire, and my T1-Ss and my friend's S-03s are both Y rated anyways. The speed rating is only the tires ability to dissipate heat at a certain rate at a certain speed, i.e. 149, 168 or 186mph.
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