sasilverbullet

on a stock 968?

Right now I have 235/45R17 on the front, and 255/40R17 on the rears.

And does anyone know how I tell what size rims I have? Are there numbers stamped on them somewhere?

Thanks in Advance!!!

BruceWard

The diameter, width and offset are likely to be stamped into the inside of your wheels. Take one off and have a look.

I believe 255/295 will fit with the right wheels.

sasilverbullet

Thanks, I'll check them later this week when I pull the wheels off for cleaning.

Damian in NJ

If they are stock 968 17" wheels the fronts will be 7.5" and the rears 9" in width.

Jason Judd

My 18" rims have 265's up front and 295's in the rear.

Damian's spot on about the 17" rims...my car came with them.

Jason

Mike O

Jason,

What tire brand and model are you running? I'm torn between cheaper 17s and not cheaper 18s for track.

Jason Judd

Mike,

I'm using Michelin Pilot Sport Cups (PSC)...

Granted, they are expensive; but, they last me for the entire season...about 15 track days, and my wife also participates on some of those days.

So, for about $1,300 I can rely on those tires to take me through the entire year...although the last event is always interesting, what with it usually being cold outside and the tires aren't very interested in gripping too much.

Jason

Mike O

If I can double the life of my track tires by going to MPSCs, I'll actually save money. I'm getting about 7 days on the 17 inch Kumhos.

Jim Child

I really think Toyo RA-1s are the best DE tire out threre. They're cheaper than the MPSC's, they last as long or longer, and they're more user friendly. MPSC's may be a few tenth's of a second faster than the Toyos in perfect conditions, but most of the time you won't see much of a difference in the lap times.

Mike O

My son runs the RA-1s on his M coupe track car and really likes them. The problem is that they don't have the sizes I plan to use so its MPSCs or Hoosiers.

Mike O

Jim Child

On my 17" wheels, I've successfully run the Toyo RA-1s in sizes 235/45/17 front and 255/40/17 rear. I've also run 255/40/17 front and 275/35/17 rear. The 255 front, 275 rear setup worked fantastically well, but you need at least an 8.5" wheel up front.

flash968

hat fits is dependent on many factors:

what brand tire? they vary as much as in inch in hte same sizes from brand to brand
what rim? offsets make huge differences
what is the ride height? this affects rubbing dramatically
what suspension stiffness? a stiffer suspension affords you a little bigger tire
what alignment angles? depending on your camber settings, you may have more or less room

i am currently running a 255/35/18 S0-3 up front on a 9" rim with a 57MM ET and a 285/30/18 S0-3 in the rear on a 10" rim with a 52MM ET - this was absolutely as much tire as i could cram under the front - it took extremely careful measuring at HRE to get the wheels built that could do the job - the S0-3 is a wide tire - a narrower brand might get you one more size up front - there is room for one or two size increases in the rear, with a little move inward of offset, and again depending on the tire choice