Boulder GT3

In doing the prep work for he Silverstate high speed run one of the key items is obviously tires. The best tire to use for sustained high speed running per the ones who've done it are the factory Michelin Pilot Sports. Evidently, any "R" tire or MP cups don't make the trip. I assume it's because a road course tire takes differant loading all the time in all directions where this is a more one dimension stress. That's a guess anyways. Does anybody know?

LastGT3

how long is the silverstate run?
Not sure that you would havbe a problem running MPSC for 1-2 hours - I run then for tank to tank for 500km straight.
What tires do the the regulars run in Silverstate?

Boulder GT3

it's 90 miles at 140-150MPH. The regulars are emphatic about not using cups or R tires. Load rating?

Larry Herman

Unlikely. Probably has more to do with impact strength. Plus I doubt whether the enhanced grip of an R tire can really be utilized on a Highway course. You probably aren't sliding them often enough to build any real temperature, and in that case, they wouldn't be any better than a top performance street tire.

LastGT3

The street tires will be more durable - so , if there is no real heat getting into them - a Michelin MPSII would work.

Nordschleife

A very good tyre for high speed running is the Continental Sport Contact 2, with a high load rating. I have used these at Nardo (6 Hours at over 200mph) and for a lot of high speed street runnming (also above 200 mph).
The other tyres which I have run on the street at high speeds successfully have been from Bridgestone.
Its best to tell the manufacturer what you are doing, they might arrange some proper tyres at a sensible price in return for a mention.
My reservations with the Michelins is that they are 'cheesy', ie they chirrup and warn you they are reaching their limits way before they actually do so,

The Contis, and the high speed Bridgestones are 'professional' tyres, their warning on approaching limits is rather more subtle.

You will only get the Bridgestones by going to the boss of motorsports. The Contis may be obtainable through a big distributor, but check the load rating.

R+C