katheikia

I am about to order the michelin ps2 for my 06 550 sports package. Are these the correct sizes:
245/40r18
275/35r18
I am sooo tired of the runflats!!!
Going to order from costco.

Locksmythe

Yes, those are the standard sizes for that wheel package.

(I ordered replacements at Costco just this morning)

katheikia

Thanks

gwf545

I got a set for my 545 recently from COSTCO for $1335, installed, with road hazard protection, etc. Let us know what your final price is. I orderend them on line and it took a while for them to show up. Be sure to call the instalation center before you go in since the tires can come in separately and the emails they send are not real clear about the order being complete. Mine arrived in three separate deliveries.

CA550

What's your opinion on the PS2s now that you're using them? I'm considering pulling the runflats off immediately upon delivery of a 550 and going straight to the PS2. Does the tire pressure monitor still work after the change?

gwf545

The tire pressure monitor works fine. The PS2's are a much nicer ride than the Bridgestone RFT's and the Dunlops that I had before them. BMW replaced my Dunflops with the Bridgestones due to the odd wear / noise problem reported elsewhere on this board. The Bridgestones were better, but they too rode hard and more recently seemed noisey. The PS2's feel different, are maybe a little slower to turn in, but they make the car ride like a BMW, not like an SS Camaro on wooden wheels. I wish I had replaced the RFT's with the PS2's right off, but I didn't like the idea of "wasting" the RFT's. I now think I shouldn't have been such a cheapskate and should have forked over the dough for the PS's earlier.

katheikia

Just finished ordering them, it came to 1328.48. Looks like they include the road hazard in the price. I went to the warehouse yesterday to check it out and make sure they have the right equipment. They were very professional, and they were installing tires on a massarati, so they should be fine with my car. I had checked tire rack and I couldnt even find the PS2 on there website, plus I think that after you add in road hazzard and install, costco might be cheaper. Cant wait to get them, with the cold weather, the run-flats are unbearable!!!

gwf545

RE: Cant wait to get them, with the cold weather, the run-flats are unbearable!!!

I hadn't even thought of cold weather, I'm in southern California and it rarley gets below 40F. They must be awful at 20F! BTW, I finally got a chance to push the PS2's on some twisties yesterday and they were great. Most notably the skittishness of the rear end is definitely gone. The PS2's dont's skip/hop around over rough road while cornering like the RFTs did.

katheikia

Yea in the cold weather they become like blocks of ice..and your right about the runflats skipping and hopping over bumps, I havent been able to drive this car they way its meant to be driven because of this...I think its going to be like getting a new car!!!