I've followed TX a little on this forum since it seems to have the largest CMC field and the competition seems tight......between Mid Atlantic and Great Lakes not sure who is second largest. Last year we had between 6 and 13 CMC cars at our races. We paddock together, work on each others cars, and all live close enough that we get together outside of racing pretty regularly......and the ball bustin is brutal!
I burn a new set of RRs in a weekend. 5 or 6 heat cycles max, after that, they aren't competitive. Usable for practice for heat cycles 7-10.
There's an R888R out now. 100 treadwear at ~6/32" tread depth (RR is 4/32" RA is 8/32"). I wonder if a higher treadwear tire will be more consistent across heat cycles?
Toyo/Nitto have a bunch of tires with varying tread depths in the 100 treadwear range, R888R, R888, RA1, and NT01. There's also an RS1 full slick, however it's non-DOT.
https://www.toyotires.com/tires/competition-tires
- Josh
CMC #50
It probably depends on the load the tire sees. Mike's car with full aero likely puts significantly more load on the tires than a CMC car. A few degree temperature increase due to higher load per heat cycle might make them drop off much more dramatically, just a hypothesis. So when comparing across platforms it could be both. Tyler is seeing potential better life on the Miata.
I'm assuming the tires are 'curing' with heat cycles, (i.e. getting harder, would last longer rubberwise but have less grip). Does the length of the heat cycle matter? If you over cook a set by trying to pass Jerry for 10 laps can you use them up in one race by getting the tire temp to 250*F? If you don't get them up to 220* (max recommended temp) is it a partial cycle? Clearly, I don't understand tire design.
- Josh
CMC #50
For my car - aero, slip angle, ambient temp/surface temp, tire temp, load etc. contributes to degradation. I consider them "not competitive" when I've lost a second over the prime. Also, 250* will kill these tires. I cooked a set at TWS testing one year and they were complete junk the next day. I try to keep them below 225*. 200* is better.
One way is for him to come out to Mid-Ohio for one of the three races (April, May and August) there this year and hang with the group. He could also contact the regional director Bob Denton. His contact info is in the back of the CMC rule book.
Where in Ohio would this guy be moving to? We have a couple of racers in the north east ohio area.
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