Mixing tires on 99 Boxster

[KevinH1990]

My owners manual says not to mix tires.

I chose to ignore that and just replaced the rears when I had a flat tire. I definitely would not mix tires on the same axle, but I haven't encountered any problems with the Toyo Proxes on the rear and Yokohomas on the front. The tread patterns are similar so that might help.

I've been using the car as a daily driver with some spirited driving on mountain roads. Before I do any high speed driving such as drivers education on a track, I plan to have matched tires all around.

[kls]

"Hi Kls:

1) What are your tire pressures?
2) What are your tread depths as measured in mm or 32's?
3) You should always have both hands on the wheel , as this is the preferred driving position."


I'm running 29 lbs in front and 36 rear. The rear tires, at their worst, have 4/32 of tread and the front 6/32.

Originally Posted by kls

"Hi Kls:

1) What are your tire pressures?
2) What are your tread depths as measured in mm or 32's?
3) You should always have both hands on the wheel , as this is the preferred driving position."


I'm running 29 lbs in front and 36 rear. The rear tires, at their worst, have 4/32 of tread and the front 6/32.

Kls, you need new rear tires...soon. When new, our tires are about 10/32's. Tires are considered "worn out" at about the 3/32nd mark.

[kls]

"Kls, you need new rear tires...soon. When new, our tires are about 10/32's. Tires are considered "worn out" at about the 3/32nd mark."


Thanks bmussatti, it shall be done. Would you match the Michelins on the front, or just get a new set? Also, does the tire pressure sound OK?

Originally Posted by kls

"Kls, you need new rear tires...soon. When new, our tires are about 10/32's. Tires are considered "worn out" at about the 3/32nd mark."


Thanks bmussatti, it shall be done. Would you match the Michelins on the front, or just get a new set? Also, does the tire pressure sound OK?

Kls, Michelins are great tires...$$$$...but good. I would just replace the rears with a set that matches the fronts. Your tire pressures appear fine.

[jci-joe]

What are your thoughts on replacing the rear tires with new SO3's to match the front. Are there any concerns with the differing tread depths? That way, they would all match just not be the same age. The age of the front tires is 4 years also.

[MNBoxster]

Originally Posted by jci-joe

What are your thoughts on replacing the rear tires with new SO3's to match the front. Are there any concerns with the differing tread depths? That way, they would all match just not be the same age. The age of the front tires is 4 years also.

Hi,

If it were me, I think that's the best plan if not doing a complete set. One thing to bear in mind too is that many tires, especially Performance Tires often do not wear linearly, that is the Tire may have only gone from 10/32s to 7/32s in 10k mi., but be all in by 15k mi. - just something to be aware of and keep an eye out for...

Happy Motoring!... Jim'99