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#40679 Wheel and tire requirements for GT3U

From Robert Maples · GT3U, STU · Rule change

Wheel and tire requirements for GT3U

#40679 from Robert Maples · Rule change · TB 26-09 (2026-09 Fastrack)

In STU Spec Lines, Table B: Alternate Vehicle and Engine Allowances, STU-GT3U, change Notes as follows:
"All GT3U (Majors and Runoffs) cars using up to 15”x7” wheels limited to 225 section width tires shall run at current GT3 race
weight plus 275lbs. All Gt3U cars shall run a DOT approved tire with a maximum section width of 245. GT3U cars are allowed
optional 15”x9” wheels with a 1.5% weight addition or up to 18”x9” wheels with a 3.0% weight addition to the total weight
including the 275 lbs Increase the minimum weight of all GT3/GT3U 2.0 liter unrestricted engines to +75 lbs. All GT3 cars running
in STU must meet the minimum ride height of 3.0” for the main frame rails not including rub blocks and a 2” minimum for the
front spoiler and splitter.
1. Wheel and tire requirements for GT3U

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a. Cars using up to 15”x7” wheels and up to a 225 section width DOT approved tires shall run at current GT3 race weight plus
275lbs.
b. Cars using 15”x9” wheels and 245 section width DOT approved tires shall run at current GT3 race weight plus 275 lbs plus
1.5%.
c. Cars using 16, 17, 18” x9” wheels and 245 section width DOT approved tires shall run at current GT3 race weight plus 275 lbs
plus 3.0%.
2. The minimum weight of all GT3/GT3U 2.0 liter unrestricted engines plus 275lbs, plus 75lbs.
3. All GT3 cars running in STU must meet the minimum ride height of 3.0” for the main frame rails not including rub blocks and a
2” minimum for the front spoiler and splitter."

A specification table follows in the original; it is not shown here.