We Agree! 315 instead of 305

[Greg G.]

Tire Size:       DOT-approved:

                        NASA Section Width 266mm or smaller                                                  = +0.6

                        NASA Section Width 267mm to 282mm                                                  = +0.3

                        Tire size printed greater than 315 (ST2, ST3 Only)                                    = -0.3

 

We haven't decided if we keep the non-DOT number the same at 11.8"/300 yet.

As of now, this still applies to both ST2 and ST3.

 

Don't forget that there are pretty huge weight Mod Factors that already help heavier cars. 

 

[horsplay]

Hi Greg 

I'm an st-2 racer in the northeast

We are all talking about the 315 rule 

Can you give me a call to talk about this?

I can email you my number 

Keith 

 

 

 

 

 

[dparm]

On 11/18/2022 at 10:27 AM, Greg G. said:

Tire Size:       DOT-approved:

                        NASA Section Width 266mm or smaller                                                  = +0.6

                        NASA Section Width 267mm to 282mm                                                  = +0.3

                        Tire size printed greater than 315 (ST2, ST3 Only)                                    = -0.3

 

We haven't decided if we keep the non-DOT number the same at 11.8"/300 yet.

As of now, this still applies to both ST2 and ST3.

 

Don't forget that there are pretty huge weight Mod Factors that already help heavier cars. 

 

Does this mean that the existing -0.7 modifier for non-DOT tires in TT3/ST3 is gone? Or would a 305 non-DOT have to take -0.3 AND -0.7?

[Greg G.]

5 hours ago, dparm said:

Does this mean that the existing -0.7 modifier for non-DOT tires in TT3/ST3 is gone? Or would a 305 non-DOT have to take -0.3 AND -0.7?

https://members.drivenasa.com/rules/super_touring_1-4_unlimited_rules.pdf

They are both there for ST3/TT3.