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      11-28-2017, 01:41 AM   #1
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Mixing a/s 3 tires with a/s 3+ ?

so I am running Michelin A/S 3 tires.
245/35/19
265/35/19

it seems rear tires are worn out, fronts still have another year I guess,
I am thinking to replace rears only for now. I have plan to get 18" next year summer or so.

My questions are, it seems there is A/S 3+ tires out there. Can I mix A/S 3+ tires on the rear along my regular A/S 3 fronts?
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      11-28-2017, 04:47 PM   #2
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you'll be fine mixing them

you're very unlikely to notice a difference
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      11-28-2017, 06:24 PM   #3
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Honestly, people get very scared about this for absolutely no reason.

And you are absolutely 100% safe if you have matching tires on the same axle.

It only matters for really AWD cars and you spinning your tires as the tire compounds are different.
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      11-29-2017, 09:56 AM   #4
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There is actually a term in tire design world called "mixability". It's a complicated analysis of a tire's overall performance envelope in wet and dry conditions. For example, consider using two different brand/design tires where one has a significantly different tractive force versus slip angle curve not to mention a different max grip limit. Installing these different pairs on opposite ends of the car can have some dramatic effects on handling, especially turn-in and rapid steering input behavior.

The PSAS3 and PSAS3+ should be very close in behavior all across the spectrum, so you should be fine. The larger difference in this case is an older, heat cycled tire which will have a lower max grip level versus a brand new tire...still probably nothing to worry about if you're not tracking the car.
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