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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Mixing RFTs and non-RFTs?



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      10-17-2012, 07:37 PM   #1
twinship
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Mixing RFTs and non-RFTs?

OEM rear Bridgestone RFTs are toast afetr <10K miles.

Replacing them tomorrow w/ Michelin Pilot Super Sport non-RFTs, but plan to keep the front RFTs for another few thousand miles.

Any handling weirdness I should expect from mixing the RFT and non-RFT tires?

TIA.
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      10-18-2012, 02:20 AM   #2
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Having radically different tires in front and rear is asking for trouble.

The RFTs in front have much stiffer sidewalls than the PSSs in the rear. That will cause some oversteer during normal driving, but what will happen at or near the limits? How about in the rain? How about braking? How about encountering road irregularities mid-turn? And sidewall stiffness isn't the only way these radically different tires differ.

I wouldn't mix RFTs and non-RFTs and I doubt you'll find anyone that will recommend it.
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      10-18-2012, 07:27 AM   #3
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Yup, definitely change all 4. The silver lining is that the Bridgestone RFTs are in pretty high demand, so someone on the boards should be willing to take them off your hands for a discount.

Very surprising they lasted under 10K.. I think I got around 25 on my rears.
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      10-18-2012, 10:28 AM   #4
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Quote:
Originally Posted by driverman View Post
Having radically different tires in front and rear is asking for trouble.

The RFTs in front have much stiffer sidewalls than the PSSs in the rear. That will cause some oversteer during normal driving, but what will happen at or near the limits? How about in the rain? How about braking? How about encountering road irregularities mid-turn? And sidewall stiffness isn't the only way these radically different tires differ.

I wouldn't mix RFTs and non-RFTs and I doubt you'll find anyone that will recommend it.
+1

Handling can be very unstable when mixing run flat and non run flat tires. There are several examples of those on this vary forum trying to mix and having very poor results.

Tires http://www.tirerack.com/a.jsp?a=AH8&...ires/index.jsp
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      11-30-2012, 07:12 PM   #5
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BMW is crazy to include these useless, non-repairable tires on their vehicles. Just went through the same thing with a 328i Convertible. After purchasing 4 new Michelin RFT's for $1,300 got a nail which made 1 tire worthless. Rather than spend $300 to replace it, I returned all 4 and bought 4 new Michelin S/S NON-RUN FLATS and put a new Fix-a-Flat Kit in the trunk.
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      11-30-2012, 07:29 PM   #6
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Just to update this...

Have been running the Michelin non-RFTs in the rear and the OEM Bridgestone RFTs in front for over a month now with no appreciable degradation in handling.

I will replace the RFTs with non-RFTs when the Bridgestones die, but based on my experience so far there's no hurry to do so.
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