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    New Tires

    I'm ready for new tires. What is the concensus on this forum. Bridgestone RE 050 runflats or Michelin Pilot Sports and carry an aerosol can of Fix-a-Flat.

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    Re: New Tires

    Assuming you are running the OE wheels, I would suggest you consider the new Bridgestone RE050A Pole Positions in a non-runflat version. They are Bridgestone's best handling tire available in a size that will fit the Z8 and should be significantly better than the Michelin Pilot Sports which are a very old design now. Michelin's PS2 would be a great alternative but they still aren't available in sizes to fit the Z8 with standard rims. For more on this subject, see my post below entitled "Bridgestone's best tire for Z8".Grease Monkey

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    Re: New Tires

    I'm sticking with OE wheels and I'm considering going with PS2's using a 255/40 in the front which makes the wheel & tire about 1/3 of an inch shorter than stock and about 1/3 inch wider. There will be a 2% effect on the speedo, which I can live with and the slightly wider front tire will fit in the wheel well without any problems.

    I like the idea of the PS2"s as I have only read good things about them. I don't know how the Bridgesrone RE 050 (non runflats) compare.

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    Re: New Tires

    The speed is read off the rear wheels so the shorter front tires won't impact your speedo readings. However, the 255/40-18 PS2s are too wide for your OE rims. They will fit but you will be outside the recommended fitment range and the sidewalls may not get adequate support. The RE050A Pole Positions are available in the correct sizes and are virtually identical in dry performance and better in the wet.Grease Monkey

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    Re: New Tires

    The Tire Rack guys as well as America's Tire/Discount Tire said the 1/3 of an inch width difference wouldn't impact the sidewall integrity, but they also all agreed that the Bridgestone 050 Pole Positions were a better tire, especially in damp conditions. Interestingly the Bridgestones weigh almost as much (30 lbs v 31 lbs) as the run flat version, whereas the PS2's weigh around 4 lbs less per tire. That's quite significant, if you're looking for fractions of a second around a track, but not really that much in real world city/suburban driving.

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    Re: New Tires

    If the PS2s will fit your rims without sacrificing sidewall integrity (their opinion, not mine) and won't cause clearance problems with the front suspension, then I would choose them over the RE050A Pole Positions. Grease Monkey

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    Heres a link


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    Re: New Tires

    I installed the Bridgestone RE 050 non-runflats in the OEM sizes and the difference is remarkable. The OEM tires were Bridgestone 040 runflats and the they were hard, as expected but they also went out of round at some point, probably due to the car not being driven for about a six-month period. The ride was horrible and the flat spots made an annoying slapping sound, as if a large sticker was attached to the tires.

    The new Bridgestones are exactly as advertised - extreme performamce, grippy tires that exude confidence. They are marginally lighter than the run flats as well.

    I had considered a size compromise in the Micheling Pilot Sports but the practical corner of my brain said stick to the OEM sizes - BMW only spent several hundred million dollars to figure out the optimum dimensions, so why would I second guess them.

    Thanks to Grease Monkey for the advice!

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    Re: New Tires

    Glad to hear you like the RE050A PPs. Z8Mania has also installed them with excellent results and Z8Bob just ordered a set so you're in good company. Unfortunately, any tire, run-flat or not, can flat spot while it is parked. Some tires will flat spot in as little as one day, though this condition is generally temporary and goes away after some driving miles. Cars which spend long periods in storage are likely to have flat spots and these may be permanent. The rule of thumb is that low profile tires (50 series and below) are most susceptible to flat spotting so if your Z8 spends long periods idle, you really should address the problem. The best solution I've found is to park your car on a set of compliant rubber pads called Tire Cradles. They are made from a unique and very expensive rubber produced in Germany which compresses just enough to allow your tires to remain round, no matter how long they sit idle. They aren't cheap but they definitely eliminate the flat spotting problem. Check them out at www.tirecradle.com.Grease Monkey

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    Once again GM steers us right!

    I not only got the RE050A Pole Position (be sure you got the PPs as there is abig difference to the non PP tires) and they are terrific tires. A big improvement over the MPS1 in every way. My old MPS would feel a little out of balance when Id even let the car sit for a few days- and it would go away as I drove- usually took 5-10 minutes. With the tire cradles its smooth driving from the get go. I can put up with that 5-10 minute drive to reorient the tires, but I would think a prolonged sitting would cause more permanent flat spotting.

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