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Originally Posted by PasPar2
actually 3 questions:
1. have the opportunity to purchase Y spoke 20's with tires that are mismatched: continentals upfront and michelins in back. Is this an issue for the AWD system? in general?
2. Any way to estimate how many miles are actually on the tires? seller is saying 12k miles...
3. i have 3rd row so no spare. What do others here do when swapping the rock hard runflats to regular tires? I'd rather not drive around with a tire in the back  although in the past 8 years and 4 cars I dont ever recall having to replace a tire... but murphy's law will strike - i just know it. |
1.Should not be a huge issue. You may get some vibration if the tread pattern is really mismatched. It is recommended you run all 4 tires the same brand and model.
2. Tread depth gauge is the best indicator. You will need to know the depth of the tire new to try and gauge what is left on the tire. You can buy a tire depth guage for $4.00 at your local auto store. I think it's more important to know how much tread is left since we all drive differently and that will affect tire wear.
3.Many people will use the tire flat repair green goop. BMW sells the Mobility kit, but you can put one together yourself for 1/3 of the price. A decent air inflator, can of slime tire repair, some work gloves, rag, digital tire pressure gauge and your set. Airman make a decent kit for about $35.00. Unless you want to cary a jack and a patch kit this seems to be the only option.