285 VS. 265 REARS?

[drpaulmarsh]

I will be installing the ROW M030 supsension on my 99- C2 coupe mostlikely next weekend.

I plan on getting new tires and a alignment too, but can't decide which size I should run on the back... (I have 18" stock rims)

1. Which would you choose and why?

2. Do you have any suggestions on alignment specs as well?

Paul

[Loren]

1. 285's with the caveat that you need at least 8" front wheels to balance out the handling. Ala GT3 mk1.

2. As negative as suggested specs allow. A little more tire wear but improved handling.

[drpaulmarsh]

Other than at time of purchase is there a way of seeing if my wheels are at least 8" wide in the front?

In my signature below is my garage too if that helps...

[dj996]

The wheels should have the width and offset stamped on them near the valve stem, if they are OEM Porsche wheels.

[Vman]

1. 285's with the caveat that you need at least 8" front wheels to balance out the handling. Ala GT3 mk1.

2. As negative as suggested specs allow. A little more tire wear but improved handling.

Loren what do you mean ALA GT3...didn't the GT-3 always come with 235/295 and 8.5x 18 and 11 x 18 wheels?

Also, more importantly, I assume there is nothing wrong with running 225/265 with the 8x18f, 10x18R, other than the car will have less understeer..read more likely to oversteer than a car with 285 in the rear?

I am asking as I have some old 18 inch turbo twist wheels in 7.5 x18 and a second set in 8x18 and want to run one rear tire size on the car.

[Loren]

Loren what do you mean ALA GT3...didn't the GT-3 always come with 235/295 and 8.5x 18 and 11 x 18 wheels?

The RoW GT3 mark I (not sold in the US) came with 8 x 18 fronts and 10 x 18 rears in MY99 to MY02. Just as today that car was the basis for the GT3 Cup and GT3R race cars.

Also, more importantly, I assume there is nothing wrong with running 225/265 with the 8x18f, 10x18R, other than the car will have less understeer..read more likely to oversteer than a car with 285 in the rear?

I wouldn't say much more oversteer perhaps less understeer.

[Vman]

Loren what do you mean ALA GT3...didn't the GT-3 always come with 235/295 and 8.5x 18 and 11 x 18 wheels?

The RoW GT3 mark I (not sold in the US) came with 8 x 18 fronts and 10 x 18 rears in MY99 to MY02. Just as today that car was the basis for the GT3 Cup and GT3R race cars.

Also, more importantly, I assume there is nothing wrong with running 225/265 with the 8x18f, 10x18R, other than the car will have less understeer..read more likely to oversteer than a car with 285 in the rear?

I wouldn't say much more oversteer perhaps less understeer.

So no real problems in running the 7.5 and 10 wheels with a 225 front and 285 rear? Other than you may get a bit more understeer?

[nycebo]

Yup, bigger tires in the rear will induce more understeer.