Tire restrictions SMF Class
07-31-2016, 08:56 PM
#2
Well, the SCCA rules state that "Tires compliant in Street, Street touring, or street prepared are permitted". Going off of this, I would read this as "if you can run it in those classes, you can run it in SM". 2wd STX is allowed to run up to a 265 tire, so I'd say that's the biggest you could go.
As far as compound goes, Street prepared states "The restriction that tires must be designed for highway use does not apply; purpose built DOT approved competition tires are allowed". This means you should be able to run slicks in SM.
Just a disclaimer, this is just how I'm interpreting the rules. I don't actually run SMF, I run STX.
As far as compound goes, Street prepared states "The restriction that tires must be designed for highway use does not apply; purpose built DOT approved competition tires are allowed". This means you should be able to run slicks in SM.
Just a disclaimer, this is just how I'm interpreting the rules. I don't actually run SMF, I run STX.
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jdbaugh1 (08-01-2016)
The following users liked this post:
jdbaugh1 (08-01-2016)
08-02-2016, 11:07 AM
#6
Are Toyo Proxes R888 any good?
What about Poxes RR?
So far this season ( only 4 events so far) there seems to be a common occurrence of rain. It has me debating if I should get a good all around "street" tire like Potenza RE-71R or Direzza ZII Star Spec instead of slicks. How big is the performance gap between these in the dry?
Last edited by jdbaugh1; 08-02-2016 at 12:47 PM.
08-02-2016, 04:06 PM
#8
Well, the SCCA rules state that "Tires compliant in Street, Street touring, or street prepared are permitted". Going off of this, I would read this as "if you can run it in those classes, you can run it in SM". 2wd STX is allowed to run up to a 265 tire, so I'd say that's the biggest you could go.
As far as compound goes, Street prepared states "The restriction that tires must be designed for highway use does not apply; purpose built DOT approved competition tires are allowed". This means you should be able to run slicks in SM.
Just a disclaimer, this is just how I'm interpreting the rules. I don't actually run SMF, I run STX.
As far as compound goes, Street prepared states "The restriction that tires must be designed for highway use does not apply; purpose built DOT approved competition tires are allowed". This means you should be able to run slicks in SM.
Just a disclaimer, this is just how I'm interpreting the rules. I don't actually run SMF, I run STX.
Originally Posted by SCCA Solo Rules
Street Tire rule section
Tires may be replaced with any size that fit the allowable wheels and fender wells without modification. (section continues to list minimum production size, treadwear, and other specifications not particularly interesting)
Tires may be replaced with any size that fit the allowable wheels and fender wells without modification. (section continues to list minimum production size, treadwear, and other specifications not particularly interesting)
Originally Posted by SCCA Solo Rules
Street Prepared tire rule section 15.3
Tires must meet the requirements for Street Category with the exception of Sections:
13.3.A.1 (minimum UTQG Treadwear Grade) Allowing any treadwear.
13.3.A.2 (minimum molded tread depth) Allowing any tread depth.
13.3.A.5 (must be designed for highway use) Allowing offroad/track purpose built tires
Tires must meet the requirements for Street Category with the exception of Sections:
13.3.A.1 (minimum UTQG Treadwear Grade) Allowing any treadwear.
13.3.A.2 (minimum molded tread depth) Allowing any tread depth.
13.3.A.5 (must be designed for highway use) Allowing offroad/track purpose built tires
08-02-2016, 10:18 PM
#9
Huh, must have missed that part of the SP tire section. So I guess you can use as big a tire as you can squeeze in there. From what I've witnessed, there is a MASSIVE difference between slicks and 200tw tires. I run 255 RE-71R's, and they have tons of grip in the dry, but I haven't tried them in the wet. From what I understand, if you run a class that allows slicks and don't run them, you will not be competitive with those that are.
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