The rear tires are 1" larger in diameter than the typical 315/25/19 or the 235/35/19 Fronts.

This should cause your PSM to kick in premaurely.

This combination might also eat your differential.

I have seen many cars now with this combination, most likely because the 305s are cheaper.

Who has put real mileage on this combo? Did you have any problems? Did PSM kick in during aggressive canyon driving?

 

I run 315's in the back+ 235's in front and I've put 10K miles on the car. You don't want to know how I drive my car, LOL. Differential is still ok. PSM come in, yes.

 

I had this combination on with Pzeros when I bought my car. I ran them for another 6k miles before running the rears bald. No issues with psm on or off the track. The biggest issue I had was rubbing on the inner liner at the rear; there's more clearance with my 315/25-19's than with the 305's.

 

I did some research and according to them your front diff will eventually fry.

 

I guess I can't buy your tires then

 

Too bad, I have two sets of 305s in my garage. I think the 1" larger diameter will contribute to the rubbing.

 

Who told you?

 

+1
Me also Art, and I do not tend to baby the car once it is rolling

I have run this size in Pirelli (came with the wheels from wheel enhancement), and a couple of sets of PS2's.

 

black bear, not all 315/25/19 tires have the exact same rolling diameters. you will see this if you just go to the tire makers website. this also holds true for all 235/35/19 tires. They are all slightly off. I think 1" is pretty borderline... ideally you want the same rolling diameters, or as close as possible. i don't run your sizes, but on my 18"s, the OD on both front and rear is 25.5" exactly and that's what you should be looking to accomplish as well.

 

This does depend on offset;mine rubbed on the inside on the RG5 19s. I can look up the offsets if you're interested.

 

I did a search for 996T's. But of course this doesn't apply to non awd cars.

 

BlackBear, i've heard horror stories of this happening. It's not JUST a matter of tire size, every mfg is different. Go to your tire mfg website, look up your tire sizes and check the overall diameters...

 

i have put 5000 miles on 235 on front and 305 on rear with no problems.. this is what came on the stock 08 turbo wheels. i just bolted them on and never looked back..

 

Alot of ppl run this setup but I haven't seen anything myself go bad.
But I've read that it has for some

 

I'm using 225/40/19 and 305/30/19 for more than 2000miles without any problem of PSM except having a bit of rubbing fender liner during aggressive driving in mountian road.