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[jmgsxr]

so i just had to put new tires on the car and i went with a non runflat toyo proxy4 the car rides much smoother but i feel like i lost a lot of handiling, the car feels like it rolls alot more now almost unstable at highway speeds. I'm not sure if i should go back to the runflats or just a different non runflat tire?? any suggestions? The car is a 335xi with stock 225/45/17

[mr_milo]

Have you tried bumping up the tire pressure? I heard non-RFTs need a few more PSI.

[Bartman619]

Originally Posted by jmgsxr

so i just had to put new tires on the car and i went with a non runflat toyo proxy4 the car rides much smoother but i feel like i lost a lot of handiling, the car feels like it rolls alot more now almost unstable at highway speeds. I'm not sure if i should go back to the runflats or just a different non runflat tire?? any suggestions? The car is a 335xi with stock 225/45/17

How new are the tires ? New tires take several hundred miles to break in. Increase your air pressure to compensate for the non-runflat sidewalls.

[twinturboa51]

proxes4 are all seasn, not summer tires. you will lose a little traction. as someone mentioned bump the psi up a few pounds over factory, read the tire pressure spec in the manual for for more guidance.

[merchomini]

tire pressure, and they are not performance tires, they are all seasons, so your performance isnt going to be rediculous. They are plenty of summer performance tires that make a difference over stock......

[Tom K.]

Originally Posted by twinturboa51

proxes4 are all seasn, not summer tires. you will lose a little traction. as someone mentioned bump the psi up a few pounds over factory, read the tire pressure spec in the manual for for more guidance.

OEM tires for the OP's AWD car were A/S - either Conti SSR or Bridgestone EL42. Frankly, I was very unimpressed with the Proxes 4 tires on my E46 - the Conti Extreme contact DWS is a much better A/S non RFT tire.

As others have suggested, for less roll increase pressures about 3 psi over stock - but I'd return to stock pressures in the winter as these tires are not great in snow.

Tom

[jmgsxr]

Yes my stock tires were a/s conti ssr, I will try bumping the tire pressure I don't have a manual but tire pressures are listed inside the door.

[Gary@TireRack]

Even all-season run-flat tires have pretty stiff sidewalls so it does not surprise me too much that you are feeling a difference. Of course the car isn't rolling any more as you didn't change the suspension. What you're feeling is the effects of having a softer sidewall.