datamg

Hey guys, I don't have headers but do have tune and some cat deletes air boxes, etc. I am running 19" wheels right now and considering a 275/30/19 rear but currently have 235/265 front/rear.

My question: given those bolt on mods...do I need 275's to hook? (Haveing issues now but may be because balding PSS)

also: if I go with 275, what are the pro's cons of keeping 235's vs buying 245's in the front ( rubbing, activating traction/stability, etc)

I'm sure it has all been extensively discussed in separate but can seem to find anything in conjunction with fronts/rears. or too conclusive. thanks in avance guys.

Dreamwagon

See my FS post on the PUR 4OUR wheels and tires. I ran 275 rear and 245 front no problem with H&R coils

datamg

Thanks. I know they will fit. Just more wondering about necessity of 275 given mods and necessity of having 245/275 vs 235/275.

jcfay

I upgraded to 245 front 275 rears when I got my 19" wheels. It's a good combo. But I don't think you'll run into any trouble if you want to keep at 235 front. And as far as the 265 vs. 275 debate, that extra 10mm ain't gonna make that much of a difference, not nearly as much as your bald PSS vs. some new, grippy rubber. It's such a small difference in size that IMO it doesn't matter. What's more important is that the tires that you've got are in decent shape and appropriate for the weather (summer vs. all season, etc.).

You should have no rubbing issues with 245. And nothing for TC/ESP, or anything else. Enjoy

QuartzBlueP31

I am running 235 up front on 19" x 9" and wish I would have gone 245. 235 are ok but alittle narrow for me on the 9" wheel.

Running 275 on the rear on 10.5"s
The 10mm more on the rear may not help but looks alot more aggressive!!

Diabolis

^ This. The extra 10mm isn't goign to make nearly as much of a difference as a different compound or fresh rubber that hasn't been heat-cycled to hockey puck consistency.

Exhibit13

In the rear you are going to want to go as fat as possible (which I think is 275 on a non black series) because our cars are RWD, you will also want to go with a good compound like the PSS. These cars spin the rears so easily so fatter is better.

As far as the front tires are concerned you probably don't need thicker than the stock 235s because our cars are not AWD and the grip around turns from the 235 PSS seems to be more than enough, for most drivers anyway. While it is super easy to spin the rear tires on these cars, have you really ever slid the front of the car? Getting 245s might give a small increase in grip but there are two downsides to that.
1. The 235's should be cheaper than the 245's or 255's
2. The weight increase is a bad thing with severe effects on acceleration and braking. Remember that each one pound of weight on the hub is equal to SEVEN pounds in the car. This is the reason you want lighter wheels, lighter brakes, lighter tires, etc. It may not sound like allot but it adds up and if you are able to shave just 5 pounds off each of the four corners that is the equivalent of a 140lb decrease of load in the car!

nuhuelins

It's such a small difference in size that IMO it doesn't matter.

zcct04

Depends on what you plan to do with the car. Drag race? Go to 225 to lower weight and rotational mass. Road race? Go to 245 to prevent the wider rears from making the car under-steer. Street car? Stay with 235 to keep decent looks and save cost.

avery.whss

I have 285's on 20's with stock suspension, I can chuck 305's in there and have like a pinky width to spare but honestly 305's are $$$$ and the 285's are already almost $600 a pop ..i never have any traction issues, on the front I run 245's

Exhibit13

You have 285 PSS in the rear and they don't rub? I thought 275 was max unless you had BS? Or did you get the camber adjusted to make them fit ricer style?

avery.whss

not PSS, but i've had 285 PSS and didn't rub, I've been using falkens, they are amazing and last way longer.



Didn't do anything to the suspension or any camber, just chucked them on and it fit's ..i mean yeah if i have 3 whales in the back seat and go over a speed bump it'll bottom out, but i think the rear seats have maybe been sat in <5 times in 3 years

Exhibit13

Specifically what tires are you running? And your saying they grip as well as the PSS?

avery.whss

falken FK452 ...they last awhile too, they actually are great in the wet..TC never comes on and they have like no road noise

keep in mind i dont track my car, i just DD it, if i did track it obviously i'd use my OEM 18's with some thicker tires, it all depends what your doing with the car, but i have no issues with handling or losing traction

Diabolis

While for street driving at sane speeds you can pretty much put anythign you want on it, at the track the car dynamics change a fair bit with skinnier tires at the front and wide tires at the back. Yes, for drag racing that would be ideal, but on a road circuit the front is going to understeer even more if you add more grip at the back without also increasing grip at the front. If anything, it's the fronts that need to be wider, not the rears. You are not going to just floor the throttle at the apex but rather gradually feed it in anyway, so breakig the back loose is nowhere near as much of a concern. Ideally for optimum handling you'd run a square setup (I'd love to be able to fit 275s on the front), but I had to settle for 255F & 275R on my 19s and went with a set of 235F & 255R R-comps on the OEM 18s. The smaller the difference in size between F & R, the more neutral the handling of the car.

Exhibit13

You are correct and I don't at all dispute that changing the size of the tire can and will disturb the balance of the vehicle when pushed hard. I should have added the disclaimer that my previous statement applies to most drivers and on the street.

datamg

For sane street speeds, is it really noticeable? The disparity in 235/245/255 in front?

Can you turn the wheel all the way with 255 in front on 19's?

Diabolis

Yes, it is somewhat noticeable on the street as well, but probably not in the way you're thinking. With the 255s up front, it does have a tendency to tramline and follow the ruts in the road more than it did with the narrower tires, and there is marginally increased tire road noise.

There is no tire rubbing including at full steering lock or when braking hard even when loaded with three passengers. Tires are Michelin PSS 255/35-19 (XL 96Y), mounted on what is now a 9" wide custom offset rim, around ET47.5 (give or take 1mm according to my calculations). I am not lowered although my coupe is the Canadian APX version which retains the stiffer and 10mm lower suspension from the old P30 package that wasn't available in the US since the introduction of the P31 package in 2010.

For what it's worth though, with Toyo R888s in 235/40R18 and 255/35R18 (OEM sizes) on OEM rims the car is still four seconds a lap faster around Mosport than with the wider PSS. If you're going to track it, the softer R-comp rubber makes much more of a difference that the 20mm increase in contact patch width on street tires.

Just keeping fingers crossed now that the dealership will say "yes, now you can get the enhanced cooling package here as well".

Bemads

My car will be lowered with the Eibach pro kit. will this still work? or would i get issues. thanks in advance