285/30-18s on an STI for Autocross...

[Dean]

OK, I don't quite know how they are fittng them in to the wheel well, but it appears that the new tire of choice at least for STIs is the 285/30-18s.

I can't verify this, but in an email from Sam Strano, he mentions that Joel Fehrman is using 285s, and I can only assume that is a 285/30-17...

The challenge has got to be figuring out what rim/offset works for that. And of course, perfectly rolled fenders.

[Kevin M]

There's a few guys in the Motorsports forum on nasioc who've been running 275s all year. I wonder what the physical gain is from 275 17s to 285 18s. Would be taller and heavier I would think.

[sperry]

Originally Posted by Dean

OK, I don't quite know how they are fittng them in to the wheel well, but it appears that the new tire of choice at least for STIs is teh 285/30-18s.

I can't verify this, but in an email from Sam Strano, he mentions that Joel Fehrman is using 285s, and I can only assume that is a 285/30-17...

The challenge has got to be figuring out what rim/offset works for that. And of course, perfectly rolled fenders.

If by "perfectly rolled fenders" you mean "cut to hell", then yeah, I see those working out.

[Dean]

Originally Posted by BAN SUVS

There's a few guys in the Motorsports forum on nasioc who've been running 275s all year. I wonder what the physical gain is from 275 17s to 285 18s. Would be taller and heavier I would think.

Actually, a 285/30-18 is smaller in circumfrence then a 225/45-17

That is part of the reason why they chose that size as 275s are typically taller.

I'll dig for more info.

[Dean]

Originally Posted by sperry

If by "perfectly rolled fenders" you mean "cut to hell", then yeah, I see those working out.

ESP STI, so yes, you can modify the fender for tire clearance.

[Kevin M]

Originally Posted by Dean

Actually, a 285/30-18 is smaller in circumfrence then a 225/45-17

That is part of the reason why they chose that size as 275s are typically taller.

I'll dig for more info.

Ah, nice. What was Allon running at Hawthonre, 275s?

[Dean]

Originally Posted by BAN SUVS

Ah, nice. What was Allon running at Hawthonre, 275s?

Don't know, but he was in AS, so I doubt he was on much over a 245.

[MikeSTI]

I think I remember seeing a car with 285's and they stuck out about 2-3" from the car.............LOTS of cutting to get them not to rub

[Dean]

Originally Posted by MikeSTI

I think I remember seeing a car with 285's and they stuck out about 2-3" from the car.............LOTS of cutting to get them not to rub

That had to be on bad offset wheels. a 245/40 fits pretty easily with the correct offset, and a 285 is only 4cm wider, or a less than and inch and a half wider. I agree that wont fit under an unmodified fender, but again, with the right offset, it would not require that much of a hack job. Especially if your suspension has the 32mm hollow front sway bar they top guys are running, and fairly stiff springs. They ain't going up very far anyway...

[MikeSTI]

yah I take that back i cant find the picture, and now I'm reading of people thinking 315's are the nexted step

[dayofpain]

i think at this point i have done more research than most about what fits and what doesnt.

the perfect size that will fit without roll is 265 40 17 on a 9 inch wide rim on et40.

at et35 you get protrusion and need to be back at stock height to prevent rubbing.

http://www.tomhoppe.com/pictures/05%...m%20and%20TNT/

275 /17 /50 et 35



275 /40 / 17 et35



thats same car at infamous nationals pic.

NOONE i have contacted by PM runs over 255 on the street. not saying it isnt being done, just noone admits it

[Kevin M]

I think Allon was on 275/40s on stock 17x8s. It looked ridiculous, but apparently function>form on an 05.