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PostPosted: Sat Apr 28, 2018 4:18 pm 
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Postmeister in Chief

Joined: Sat Jul 17, 2004 9:37 pm
Posts: 4243
Location: Southern California & AZ
TECHNICAL BULLETIN 4-28-18
ST4/TT4 and ST5/TT5 Hoosier DOT Wet Tires

ST1-4 Rules
6.4.1 ST4 Tire Limitations

1) Compound
Non-DOT approved tires are not permitted in ST4. DOT-approved R-compound autocross tires
shall be assessed via the “Adjusted Weight/Power Ratio” in ST4.

Hoosier DOT Wet tires shall be assessed as autocross tires except during officially designated
"Rain Sessions" when they may be used without a Modification Factor assessment.



ST1-4 Rules
6.5.2 Modification Factors
Tire Type


ST4 Only: DOT-approved R-comp Autocross tires = -1.0
(examples: A6, A7,
DOT Wet, R1S, RS AC, Z214-C90/91)


ST5 Rules
6.1.2 Tire Limitations

1) Compound
1) Tire treatments and softeners are not permitted.
2) Non-DOT approved tires are not permitted in ST5.
3) DOT-approved R-compound autocross tires (“A-tires”) are not permitted in
ST5. (examples: A6, A7,
DOT Wet, R1S, RS AC, Z214-C90/91)
Hoosier DOT Wet tires shall be permitted ONLY during officially designated "Rain Sessions"

_________________
Greg Greenbaum
National TT, PT, & ST Director
Nat. Medical Director
greg@nasa-tt.com


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