Tires after autocross - LotusTalk - The Lotus Cars Community
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post #1 of 8 (permalink) Old 04-21-2019, 04:33 PM Thread Starter
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Tires after autocross

Autocrossed my daily driver 05 mini cooper s and I noticed a build up on my rear RE71R. Anyone have any idea what's going on? It was warm day, I'd say about 65 at the most. Front tires looked normal. Rear tires are older than the front if it matters? I didn't race my lotus because I need to get an alignment done and that's scheduled in two weeks!
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post #2 of 8 (permalink) Old 04-21-2019, 05:36 PM
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That looks like you picked up “marbles” on the track. If you don’t know, marbles are chunks of rubber that is shed off the tires as you corner and then left on the track, in most cases off the racing line. If you go off the racing line with hot tires, the tires can look like yours.

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post #3 of 8 (permalink) Old 04-21-2019, 05:55 PM
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OPR... other people's rubber.
Usually a problem on concrete or other grippy surface.

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post #4 of 8 (permalink) Old 04-21-2019, 06:16 PM
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Are there black streaks of rubber on the car? Or does that only happen when following a car with race tires that are throwing off marbles?

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post #5 of 8 (permalink) Old 04-21-2019, 06:50 PM Thread Starter
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No black streaks. They do peel off, so it must be rubber debris.
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post #6 of 8 (permalink) Old 04-22-2019, 05:50 AM
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Normal. That's what modern "street" tires do. It's just a result of a really sticky tire. I've been auto-xing for about 17 years and you used to see this only on race tires. Since the RE71R and the new BFGs, you see it pretty often.
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post #7 of 8 (permalink) Old 04-22-2019, 08:57 PM
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Autocrossing 14 years. OPR is right diagnosis. You will also occasionally see the Bridgestones get feathered edges on a hot day where the course setup has lots of turning, forcing the tires to really work hard. Don't worry about it.
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post #8 of 8 (permalink) Old 04-23-2019, 02:27 AM
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It'll go away on its own if you street drive it.
Or if it annoys you that much, get a heat gun + one of those stainless steel scrapers from home improvement stores and go to town with it.

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