RickBetterley

I am succumbing to the lure of the Dark Side; that is, I am going to try Hoosier R6s in place of my Toyo RA-1s.
The Toyos are 245/40x18 and 275/35x18
Hoosiers are 245/35-18 and 285/30-18
Any thoughts as to whether I will have clearance problems? The Toyos are snug but fit (fenders are rolled and the alignment is DE aggressive, though i don't have the settings in front of me).
Thanks in advance.

Slantnose!

Hoosiers are usually a little larger than the size they say.
Anyway, that is a common size that should fit fine.
You won't believe the difference they make...

Larry Herman

Rick, I run the 245/35-18 and 285/30-18 R6s and I think that they may be a little too short for your car. Unless you have a really stiff suspension to keep them flat on the track, you might be better off with slightly taller tires like the 245/40x18s and 295/30x18s. The 295s are only marginally wider then the 285s. Some of the guys here who run 993s think that the 40 series tires in the front brake better too. Food for thought.

bobt993

^^^^^^^^^^, ditto from Larry. 245/40 for better braking, but you will get some rubbing. Have the alignment setup with the tires on the car and check, since car to car this seems to vary a little. I have 285 and 295 in the rear. With all the suspension you have, I hope you have ERP's in the rear links. You must have these to avoid rubbing on the oil lines. A very small wheel spacer can also be handy for rims with 65mm offsets.

Mark in Baltimore

245/35-18 and 285/30-18 are exactly what I run, Rick. The 245/40's are just too tall for my low suspension.

TheOtherEric

Rick-
Those are the RA1 sizes I've been running. I think 245 and 275 are a great combo, but unfortunately the aspect ratios aren't ideal, so the tire has a big OD (25.5"?). No biggie IMHO.

I have to run a 5mm (?) spacer in front, or else I get rubbing on the inside drivers side. I'm around RS ride height.

RickBetterley

Sounds like I should be fine, then.
Sounds like you had fun at the races; enjoyed your writeup.

bobt993

Mark, there is a huge difference in braking with the 245/40. I have used both, but gain alot of grip out of the added width.

RickBetterley

That's good to know, too.
I have yet to use all of the brakes I have (the 993 has way more brakes than my old 1984, + it has of course ABS).
'Course, you can never have too much brake capacity.
thanks again

Mark in Baltimore

Thanks, Bob, but I just can't make 'em fit.

Why is there such a difference in braking with the taller tire?

bobt993

Tire is not just taller, it is........wider. Makes sense huh? NO. 245 is a 245? No.

I had both sizes next to each other and there is more width on the 40 (tirerack confirms this in the spec sheets). Also during compression of straight line braking the 40 sits down a little more due to the shoulder flattening.

I guess this is one of those make no sense, but oh well situations.

Jason Judd

Rick,

Welcome to the Dark Side...You'll love it!

Got no friggin idea which tire combo is right for you air breather, but stuff as much as you can on those lovely rims of yours...More tire = bigger footprint= more braking.

I agree...can't have too much brake...especially with our driving skills!

Jason

RonCT

Take a look at the online specifications for both R6 and RA1 to compare physical dimensions. For example, the 245/40-18 RA1 has a diameter of 25.59", a tread width of 9.65", etc. compared with the 245/40-18 R6, which is 25.3 and 9.3 respectively. I don't have the data on the rears - my car takes wider. Appears to me by the numbers that physically, the Hoosier is a "smaller" tire than you have, so theoretically, it should fit "less snugly".

Bull

I ran 245/40x18 R6s on the front of my 993 without any rubbing, and no one ever said the car wasn't low (-2.8 camber). I ran 295s on the rear, but it was a WB S.

Mark in Baltimore

Thanks for the info, Bob Tee.