the issue is that not every car can run steel rims.
for example, a subaru STI. there are no steelies out there that will ever be able to clear the calipers on the beast of a car.
You posted a staggered set up on the tires. the tech probably suggested run flats because i dont think ur Z4 has a spare tire. as to if its manditory to get run flats actually, this one i dont know. reason being is i dont know exactly how the oem rims look, and the actual placement of the tpms sensor. if u go with a traditional tire, and u happen to have a blow out, will the side walls be strong enough to hold up just enough weight of the car so that you dont drive, roll over, run over, the tpms sensor on the inside. how the tpms sense is mounted is screwed onto the valve stem, but the sensor itself is roughly about 2 toonies big side by side, and about id say easily 7-10cm thick. its suppose to sit roughly flush to the drum of the wheel. but if u have a tire blow out w/ conventional tires, u might run the chance of just destroying it as u roll to a stop. i really dont know about this one.
and tpms arent cheap. the total quoted price probably includes the programming of a 2nd set of tpms (ur winters). and thus being from the dealership, u have no choice but to have them done there.
i suggest to shop around for pricing of the same tire. the price different might be justified enough by piece of mind and handling of all warranty issues at 1 place.
good luck, dont drag it along too long, im pretty sure everyone on here can tell you that it feels like a bad winter is gonna be upon us this year.
Quote:
Originally Posted by DannyITR  The guy at the dealer apparently said only run flats can be installed on the 18s from the M package so I suppose the winter run flats are close to 1K each plus the TPM + tx and your close to $5K. I guess he was unwilling to suggest steel rims with non run flats would cost less than $1K since they probably don't sell them. |
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