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Old 08-11-2017, 10:57 AM   #1
Dieselman88
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Default New tires but different tread front and rear cause issue?

I have a 04 WRX. I know Subarus are very sensitive to tire size and all having to match on all 4 corners. My question is do the tread patterns have to match front and rear? I bought some wheels for my car, has 4 brand new tires on it 214 45 17, tread depth is identical. The front 2 are cooper zeon rs3-a tires and the rear 2 are sumitomo tour plus lsw . Both non directional tires. The car seems very jittery now, especially on highway. Almost like it's really windy outside, idk if it's the car just following the grooves on highway or what. Didn't really seem to notice it with my other stock wheels, might just be in my head lol. Called local dealer and they said it shouldn't matter. I was just thinking with different tread pattern/grip front and rear of it would make a difference The wheels I put on are 17" stock brz wheels. Taking it into subaru today for air bag recall and alignment check.
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Old 08-11-2017, 11:42 AM   #2
Patrick Olsen
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New tires have tall tread blocks, which means lots more tread squirm than old tires. Add in that the tires you've got are on the soft/comfort side of the performance spectrum (particularly the Sumitomos) and the car will feel like it's moving around more than you're used to.

Personally, I would want 4 matching tires.
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Old 08-11-2017, 11:44 AM   #3
Charlie-III
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While not ideal due to potential handling differences, you should be fine as long as they wear evenly and are the same size.
They could be slightly different diameters though.

Try swapping front to rear.
Check tire pressures, low pressure may allow following road grooves more.
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Old 08-11-2017, 07:00 PM   #4
Dieselman88
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Had alignment done at dealer and really no change. Going to try another set of wheels with all matching tires in the morning.
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Old 08-12-2017, 01:05 PM   #5
Dieselman88
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Put a different set of wheels with all 4 matching tires and it fixed it. I'm assuming ones in front where a softer compound, following grooves in road more then the back tires. Doesn't feel like I'm driving through a wind storm now
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Old 08-13-2017, 12:57 AM   #6
krzyss
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The tire size is nominal, the circumference difference may be above the limit indicated by Subaru (is it 2"?).
Take tape measure and check.

The ideal situation: 4 identical tires.

Krzys
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