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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Tracking, Autocrossing, Dragstrip, Driving Techniques > Bald Street tires on track



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      10-03-2012, 08:42 PM   #1
neilvosko
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Bald Street tires on track

Hi all, sorry for silly question, but has anyone used worn street tires, balding on the track after replacing them?

basically throwing them on new rims for track use only?
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      10-03-2012, 09:00 PM   #2
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Put your flame suit on!
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      10-03-2012, 09:06 PM   #3
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huh
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      10-03-2012, 11:47 PM   #4
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I see couple issues off top of my head:
1) Street tires will still be street tires; low grip and screech around everywhere.
2) Bald tires = low heat sink capacity; they will overheat very quickly, and will have past the prime of their lives. It'll be tough to keep them in their optimal temperatures for a predictable handling.
3) More susceptible to damages from longer period of wear and tear that they've gone through.
4) If it rains, pretty screwed. And if you can afford a second set for wet, then why not just use those for dry also since most UHP or EP tires that are great on wet are also great on dry.
5) I don't think you'll pass tech inspection, since this is re: safety.

If you're talking about moderately bald, like 3/32 or something, you can prob churn out another day or two. But if completely bald, prob not the best idea.
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      10-03-2012, 11:57 PM   #5
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The compound used in R 'slick' tires is different than street tires so this won't work out like you might think. I think wonho brings up some even better points why to not do this.
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      10-04-2012, 08:57 AM   #6
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You wouldn't even pass tech so its moot.
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      10-04-2012, 09:50 AM   #7
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Low tread in the center block isn't necessarily that terrible and you can probably get away with it as long as it doesn't rain, but if you have a lot of shoulder wear, I wouldn't run them.

If the front are very worn on the shoulders, then you will probably cord during your day if you push the car, and then have to stop...I found this out the hard way unfortunately.
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