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[07335]

I believe my style 193s are 8" in the fronts and 8.5" in the rear. I'm looking at replacing my runflats with michelin piot sports. I would like to go 265/35zr18 in the rear. Does anyone think this size would fit since the rear rim is 8.5". Thanks in advance.

[BMW F22]

265 is a bit wide for 8.5" rims. The tires will stick out a lot more than the wheels. I mean you can do it if that's what you prefer but IMO you should stick with 255 on the rear.

[meyergru]

Originally Posted by 07335

I believe my style 193s are 8" in the fronts and 8.5" in the rear. I'm looking at replacing my runflats with michelin piot sports. I would like to go 265/35zr18 in the rear. Does anyone think this size would fit since the rear rim is 8.5". Thanks in advance.

With the original 193M rims, you could use 225/45r18 and 255/40r18. They should fit and difference in wheel diameter is less than 1%, thus this does not do any harm to ABS (nor DSC). This approach has some advantages over the smaller standard sizes:

1. The wheels look better, since they fill up the space in the wheel house.
2. Changed gear reduction elevates Vmax to about 260km/h (at least here in Germany, that's a plus).
3. The changed gearing should also have a positive effect on mileage.
4. Comfort is better because of more rubber and forgoing of runflats (they are not available in 225/45).

For example, Alpina B3S and M3 E92 have 245/40r18 and 265/40r18 and are considered more comfortable than the normal E92.

I don't know about regulations in the U.S., however.