Someone please explain this to me.

[roadracer311]

I don't think the front is affecting the rear traction. I agree with the comment, that it might be taking a while to scrub in your new tires.

I used to race motorcycles and spent a good chunk of a season running Dunlops on the front and Michelins on the back. I'd have no problem mixing brands as long as they are both about as sticky.

Tires should scrub-in in less than 500 miles. Probably as little as 200. The owners manual says about 200 miles IIRC.

Could be as simples as tire pressures. Maybe they even mounted them on the wrong side of the car.

How cold is it where you are now. Our tires don't have much grip below 40-45 degrees either.

[mdex]

You need to take it easy on new tires... they need to scrub in before they work well. The surface of new tires has release agents from production that have to wear off. Dont spin the tires when they are new as you will bond the release agents into the tire and extend the time it takes to scrub them off!

You really feel the difference since the front tires are sticking well, while the rears are slippery and not scrubbed int.

[Bambino Don]

I tell you i Pirelli Pzero's up front and SO2's on the rear on the S 17's and they were okay and never really lost grip ,occational slip etc...

I blast my car everywhere i love a bit of tail out as much as the next guy!!!!

I know this is of topic but, I have Cooper Zeon's on my 19's which are the same width front and rear as the 17's and myCar doesnt budge it is locked to the road in the dry and wet, the tyres are just unbelievable. I had never heard of Cooper before now i wouldnt think of getting any other tyre.

James

[jhandy]

Temp here in texas is not cold, maybe 60 or so. 50 at night.

I sure hope that these tires have a break in period. They are like ice. On black top road it is nothing to spin the car with the slightest acceleration. On concrete they stick like glue, but i suppose anything would stick to concrete.

James

[Topless]

Jhandy,

It looks like your tires are very different and may not be a good match.

Michelin PS2- wear rating 220, very sticky amazing summer street tire, lousey in cold weather.

Pirelli Asimmetrico- Several models, wear rating 420 I think?? decent all season tire, fair grip in summer, good grip in winter.

Mixing brands of tires is ok as long as you stay with the same tire performance type. Using tires with very different characteristics is probably causing your handling problems. Go back to your tire tech and explain the problem. Maybe you can find a better match.

[jhandy]

The ones I bought are the Rosso 275/35ZR18
Load Index 95 = 1521lbs (690kg) per tire
Speed Rating “Y” = 186mph (300kph) 95Y SL Asimmetrico Treadwear: 220
Traction: AA Temperature: A220 AA A 1521 lbs. 51 psi

They have the same treadwear as the PS2,
I guess they will just have to wear in.
I will put Pzero Rosso up front and see if that makes any change, until then , I guess I will just have to be careful.

James

[Topless]

Sorry J,
I was not sure which ones you had. My advice is the same though. Talk to your tire tech and explain the problem. He may be able to help.

I currently have PS2's on the front and standard Pilot Sports on the rear. Handling is pretty neutral now but I will replace the rears soon with PS2's for the most consistent handling I can get in street tires.

James, what is the tire pressure? Is the rotation arrow pointing in the right direction?

I bet they are over-inflated. Tire shops typically make this error.