Need clarification on rule #6. The rule says:
6. TURBO: Maximum compressor wheel size is 88.0 mm /3.464” - inducer wheel diameter. Turbos with a compressor exducer diameter larger than 127mm/5.000" and/or a turbine exducer diameter larger than 93mm/3.66" must use 275/60 DR's. (i.e. GT-55 & PTE Promod 88).
Please clarify which 275/60 DR tire....Pro Radial (part# 3754X) or Regular (3754R) <---- both a Mickey Thompson part numbers.
If one is going to use the bigger exhaust wheel, then the tire should a "normal" radial, not the Pro.
Need clarification on rule #5. The rule states:
5. TIRES: Rear tires may either be DOT-approved and labeled or labeled for racing slicks. DOT tires must have labels facing the outside of the body and are limited to a maximum new tread width of 12.1 inches and can never exceed 12.25 inches in width. Slicks are limited to a maximum sidewall designation of 10.5 inches width and may never exceed 11.1 inches in width. No drive tire may have sidewall designation height greater than 29.5 inches. The front tires are limited to 4.5- inch minimum tread width. The tread of tires must not protrude outside of the exterior of bodyline at top of tires.
** Measurement will be taken with tape measure from end of tread to end of tread.
(This dose not allow the MT 29.5x10.5W)
With a lot of cars running radials which are based on metric tire sizing (P size), please include a metric tire size instead measurements. The measurements are confusing. There is no mention of using tire manufacturer size or actual tape measurement for the radial size.
According to the rules, there is a max height designation of 29.5" max height. Where is there an "inch" designation on radials?
Example:
There is a new 315 Pro Radial coming out. Is the 315 tire legal in TSO? I was running a 315 in TSL one year. The specs for the 315 tire from M/T site:
30x13.50x15 - equivalent size
12.9" - section width
11.9" - tread width
30" - diameter.
With radials, there should a "P" size and slicks with an "inch" size.
Billy T.
gnxtc2@aol.com