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Originally Posted by 1973914
Lets hope so  If i see a green car come through tech with slicks he will not get a signature on his form from me... as a matter of fact, not sure ANY car is supposed to be passed with slicks. |
Understand your intentions with the first part but I don't think that's a tech inspection call. On the second part about slicks, don't think that's a tech inspection call either as long as the slick has adequate depth at the wear holes and is not damaged (cuts, bulges, corded etc). Slicks are not DOT rated. Don't think a tire must be DOT rated for de.
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Originally Posted by 1973914
From the tech form itself:
TIRES – Good condition. No cord showing. No cracks or plugs. Speed rated appropriate for model, Z-rated
recommended. Tire pairs (i.e., both fronts, both rears) should be same size and type. Minimum tread depth of
3/32” on contact patch area of street tires. Discernable tread on DOT-approved competition tires.
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I think the discernable tread comes from either SCCA or PCA Racing and dates back 10-12 years ago during the tire wars between BFG and Hoosier. Goodyear wanted to get into the R tire business and came out with the GSCS R type tire. To have a DOT rating a tire was required to have a discernable tread. Goodyears answer to that requirement was to mold the tire with 2 raised ridges around the circumference of the tire approximately 1/64 in high. You would need a set of sticker tires to start the race as you would wear this phantom tread off on the warm up lap.
At the time this tire was close to a true slick but had a DOT rating. Tires were maybe 25% more expensive than other DOT tires and were not noticeably faster.