Equal Size Tires on all 4 Corners
 

I recently purchased another set of stock 19" wheels and tires and was planning to use one set on the street and one set on the track. Now I'm thinking of running one set of the rears on the front and one on the back with the stock 275 width tires. After fitting and test driving tonight, it seems like it is going to work. I'm just a little concerned about rubbing in the front with the suspension under load.

Has any one else tried this? Any thoughts or warnings? I'm heading to Putnam Park and intend to try this out next weekend.

It should be fine. I run275/35/18s all around, but they are 1" shorter than stock.

will that mean the front tyres will look 'fatter' than the rears cos the front wheels are 9' and the rears are 10'?

I'm sure he will be getting another set of wheels for them. I run 18x9.5 all around with my setup.

Actually, I have four rear wheels (10") with 275 tires all the way around. I'd like to get another set of 18" wheels, but not finding a decent deal on a light racing wheels...

I tracked the car with stock 10" wide wheels and 275 tires all the way around this weekend at Putnam Park. The decreased offset in the 10" wheels pushed the tires just outside the wheel wells, but doesn't cause any clearance issues. Performance wise, it was a drastic improvement over the stock tire setup. Turn in was much better, the car handled fairly neutral and I could easily get oversteer on corner exit as needed.

I run a 275/35 up front on a 9" rim and there is a ton of clearance, especially after adding the SPC camber kit (which also sharpened the turn-in). Even if I did 10" all around I think I would keep a little size stagger as it lets you drive into corners a little deeper. I can still get both lift-off and power-on oversteer with a 275 front and a 305 rear.

I don't think that's a good idea LOL

Is Putnam still a high abrasive track surface? I really enjoy that track, but it eats tires. Turn one is soooo fast.

Yeah, I think 275s are a bit wide for 9" wheels.

It is pretty abrasive, but there's a lot of grip and very fast. Turn 1 is awesome when you take it just right!

I ran 275/40-17s on my 350z with 9" wheels no problem.

Yep, been running them all year, been working great.

You can certainly do it, but it's on the lower end of what is recommended. I'm no expert on this, but understand that tire width should be generally the same width of your wheel. A little difference each way is acceptable, but a tire that is much wider than your wheel will result in a more rounded contact patch. Ideally you want your contact patch as flat as possible. On a car with a lot of negative camber, round isn't as bad. A 275 tire is 10.82 inches wide and fits nicely on a 10" wheel.

It's not ideal for the street but works nicely at the track. The "roundness" is greatly reduced under high load, and can be refined with tire pressure. Negative camber increase is a requirement on this car, especially the front, for non-street driving. About -2.5 for track seems to be about perfect, could probably go to -3.0 for auto-x.