Boosted355

I need some input if you guys can help. I know the options are slim out there. But I'd like to know I'd anyone has some opinions on some decent performing tires this size. If like to find something that has a matching 275/30R19 if possible. I'll be doing some drag radials on my stockers for track days.

Thanks for any help, Jim

skyavonee

Well you asked for opinions, so... my personal opinion is that 19/20's look terrible on C5's. They're also far from your best bet for performance.

If you were to do a 18/19 combo, you can go with Michelin Pilot Super Sports or Bridgestone RE-11 in 305/30 for the rears and 265/35 or 275/35 for the fronts. Both of these tires are getting lights-out reviews on Tire Rack. Based on my research, the Bridgestones are better on track, but the Michelins are the better all-around street tire.

I'm actually planning to go with the Michelins in 295/35-19 and 265/40-18, because I prefer the look and feel of meaty tires, but it sounds like you want to go a different route, which is fine.

Just a suggestion.

AU N EGL

DRs ? the bigger the side wall the better

so go to 17" rims all around for any DRs

rims larger then 18" are just too heavy for anything but shows

Latterlon

It looks like the Pirelli P Zero may be your only option. I run 265/30-19 and 315/30-20 R888's and I think a 305/30-20 would be a nice size for the rear. I wanted a thicker sidewall than the 305/25-20 provided, but the 315/30-20 is pretty tall and pushes the limits. You could always minitub and run a 345/25-20!

I love my 19/20's. I love a slammed car with big wheels. I agree that the stock wheels provide the lightest and best all around performance, but I'm street driven and extremely happy with my car, and that's all that matters.

Good luck!

Boosted355

I actually bought a set of 19/20 Interlagos after seeing them on your car, I love the look! I don't like the rubber band look of the 25 series and I'm going to avoid having to massage the inner wheel well like you said you had to do.

Do you think a 295/30 would have too short of a sidewall?

FYRARMS

Latterlon

A 295/30-20 would be about 27" tall, or an inch more than stock. It should have a nice look. The 305/25-20 retains the diameter of the stock 295/35-18. You will need to adjust your rear bolts to level out the rake to your liking, and have the tire diameter changed in the computer for your speedometer/odometer to be calibrated properly. I have had ZERO issues with Active Handling.

Keep in mind that my 315/30-20 barely fits mostly due to my low ride height. I ran 315/30-18's before, so the width is fine, its just that the added diameter extends the width into the wheel well. I'm also running Pfadt 5mm spacers out back, which IMO is necessary for the TSW's no matter the tire size. This brings it flush with the fender.

Boosted355

Thanks for all the info, that's good stuff! Regarding the spacers, I went with 19x10.5's up front, do to think I'll need spacers up there as well? The car currently dies on 305/35-18 Nittos and isn't lowered, but I plan to buy lowering bolts to bring it down some.

Latterlon

No, you should not need a spacer up front. I'm convinced that TSW offers an 18, 19 and 20 in 9" and 10.5" widths for modular benefits.

The 9" wide wheels have a 50mm offset, which is nearly identical to the stock 9.5" wide wheels' 54mm offset. The 10.5" width has a 65mm offset compared to the stock 10.5" with 58mm offset. They should be the same for a stock fitment, hence the need for a 5mm spacer to make up the difference. However, this 65mm offset allows you to run that 10.5" up front with a fitment thats identical to the 9" TSW and 9.5" GM front wheels.

Pretty smart on the part of TSW to offer this for guys running 10.5" all around for track purposes, and you only need a small spacer to make the rears perfect.

You should be fine if using aftermarket bolts since you can raise or lower the car easily until you get the ride height and tire clearance correct.

Boosted355

Thanks again for all your knowledge man, it's greatly appreciated. I'm very thankful for people like you on this forum that are willing to take the time to share what you've learned along the way.