[ellisdaniels]

I’m thinking about getting the Konig hypergrams they are lightweight and I’m thinking of getting 18’ 9’ rims in front and 18’ 11’ in the rear I’d like to run 305/45r18 rear and 255/45r18 front as far as tires. I have a 2019 camaro 2ss

[TP2SS]

www.tiresize.com can give you details on various sizes re recommended wheel widths, and also the diameter/rolling data so you can match the OEM diameters closely and avoid speedo errors as well as keeping front/rear diameters close in size. Too big a diff in front/rear diameters will cause problems with Stabilitrac/Traction Control/ABS systems.

[ellisdaniels]

Originally Posted by TP2SS

www.tiresize.com can give you details on various sizes re recommended wheel widths, and also the diameter/rolling data so you can match the OEM diameters closely and avoid speedo errors as well as keeping front/rear diameters close in size. Too big a diff in front/rear diameters will cause problems with Stabilitrac/Traction Control/ABS systems.

Thank you!!

[lt4camaro]

Originally Posted by ellisdaniels

I’m thinking about getting the Konig hypergrams they are lightweight and I’m thinking of getting 18’ 9’ rims in front and 18’ 11’ in the rear I’d like to run 305/45r18 rear and 255/45r18 front as far as tires. I have a 2019 camaro 2ss

28.8 inches tall for the rear is 1.1 inch's taller than the OE tire and your front size is 27.0 inches tall and .7 inches shorter than the OE tire. The rear at 28.8 is a little tall, and not sure the car will like the 1.8 inches difference in tire circumference front to rear. A wide 28 inch tall rear tire doesnt leave much room in the rear wheel well, I would be careful with a 28.8

[Msquared]

Originally Posted by lt4camaro

28.8 inches tall for the rear is 1.1 inch's taller than the OE tire and your front size is 27.0 inches tall and .7 inches shorter than the OE tire. The rear at 28.8 is a little tall, and not sure the car will like the 1.8 inches difference in tire circumference front to rear. A wide 28 inch tall rear tire doesnt leave much room in the rear wheel well, I would be careful with a 28.8

28.8" is a lot tall, not just a little! Also, it's 6.25% taller than a 27" front, and that's extremely likely to flummox the TCS/ABS computer.

There's really not a great tire size for this wheel unless you're just looking to autocross or track the car. In that case, 315/30/18 is probably the ticket, but at 25.6" tall you aren't going to like the looks for the street. For a 9" front tire to match, a 275/35/18 is perfect. 335/30/18 is a little taller at 25.9", and will still fit on an 11" wheel, but won't be ideal for performance on that narrow a rim width. It would be okay for street driving. We need to know how you plan to use these tires on the car.

[ellisdaniels]

Originally Posted by lt4camaro

28.8 inches tall for the rear is 1.1 inch's taller than the OE tire and your front size is 27.0 inches tall and .7 inches shorter than the OE tire. The rear at 28.8 is a little tall, and not sure the car will like the 1.8 inches difference in tire circumference front to rear. A wide 28 inch tall rear tire doesnt leave much room in the rear wheel well, I would be careful with a 28.8

As of right now I am running a 295/35 on the stock rears and I believe those are 28.1 inches so would the .7 be a huge difference?

[ellisdaniels]

I also don’t want to run a 30 side wall I believe that’s way to small for the 18 inch rims

[Msquared]

Originally Posted by ellisdaniels

As of right now I am running a 295/35 on the stock rears and I believe those are 28.1 inches so would the .7 be a huge difference?

You need to read about the issues many 1LE owners are having with the rear tires rubbing into the fender liner and tearing up the wiring harness back there. And that's with a 27.2" diameter 305/30/20. Yeah, it's a huge difference. And again, aside from that, the 6.25% difference in front and rear diameters you are proposing is going to cause big problems with your TCS and ABS.

I also don’t want to run a 30 side wall I believe that’s way to small for the 18 inch rims

I don't think 18" wheels are for you, then. There just aren't any good sizes for them except for competition. But again, how do you plan to use the tires and car? And why is a 30% aspect ratio "way too small for 18 inch rims?"

[ellisdaniels]

It’s a daily driver. I want some lighter wheels and I want bigger sidewall for the looks. I don’t want to run 30 sidewall on 18 in rims so it doesn’t look like a lifted camaro. I want a nice looking rim with a nice looking tire and being light weight at the same time.

[ellisdaniels]

Originally Posted by Msquared

You need to read about the issues many 1LE owners are having with the rear tires rubbing into the fender liner and tearing up the wiring harness back there. And that's with a 27.2" diameter 305/30/20. Yeah, it's a huge difference. And again, aside from that, the 6.25% difference in front and rear diameters you are proposing is going to cause big problems with your TCS and ABS.


I don't think 18" wheels are for you, then. There just aren't any good sizes for them except for competition. But again, how do you plan to use the tires and car? And why is a 30% aspect ratio "way too small for 18 inch rims?"

I also used to run 305/30/20 on the stock ss rims and had absolute 0 problems and I didn’t move the wiring harness or anything. Felt like the 305s were being pinched on the 9inch rim so I moved down to the 295/35 and that tire fits perfect on stock rims and is perfectly flat. I want bigger sidewall and some 305s would be ideal. I plan on taking her to the track and drag strip maybe 2 times a year. I race my buddys in Mexico also and I feel like a 19 pound rim would make a huge difference compared to the 32 pound stock 20s plus I keep my warranty until I want to go crazy on a build

[TP2SS]

Originally Posted by ellisdaniels

I also used to run 305/30/20 on the stock ss rims and had absolute 0 problems and I didn’t move the wiring harness or anything. Felt like the 305s were being pinched on the 9inch rim so I moved down to the 295/35 and that tire fits perfect on stock rims and is perfectly flat. I want bigger sidewall and some 305s would be ideal. I plan on taking her to the track and drag strip maybe 2 times a year. I race my buddys in Mexico also and I feel like a 19 pound rim would make a huge difference compared to the 32 pound stock 20s plus I keep my warranty until I want to go crazy on a build

I’ve been looking for this info for awhile, 295/35 (20 over OEM) on stock 9.5 SS rears, so this is great info! What are you running on the front 8.5’s? Also 20 above OEM (265/40)? That combo (265/40 front, 295/35 rear) is only marginally larger in diameter >2 MPH @ 80MPH but gives about 1” more width. That’s about what I’d like but I was unsure about going 20 over on the wheels.

[Msquared]

Originally Posted by ellisdaniels

I also used to run 305/30/20 on the stock ss rims and had absolute 0 problems and I didn’t move the wiring harness or anything. Felt like the 305s were being pinched on the 9inch rim so I moved down to the 295/35 and that tire fits perfect on stock rims and is perfectly flat. I want bigger sidewall and some 305s would be ideal. I plan on taking her to the track and drag strip maybe 2 times a year. I race my buddys in Mexico also and I feel like a 19 pound rim would make a huge difference compared to the 32 pound stock 20s plus I keep my warranty until I want to go crazy on a build

305/30/20 tires pinched onto 20x9 (I thought an SS came with 9.5" rear wheels though) may or may not rub on the fender line with its 27.2" diameter, but adding 1.6" more to the diameter will almost certainly cause rubbing.

No, 18" wheels won't make a huge difference at the track, especially if you put 29" tires on them. They won't be much, if any, wider. They will jack your rear roll centers all to hell, though, so you'll have your hands full with a pretty bad handling car. And for drag racing, the extra diameter will give you effectively a taller gear ratio. And again, your TCS and ABS will have conniption fits over the diameter difference between front and rear tires. I would strongly suggest you use 19" wheels and look at the tire sizes available for them. A 305/30/19 or even 315/30/19 would work very well on a 19x11. A 275/35/19 would work well on a 19x9 up front, but you should really look at 19x10 for better performance (or 19x11 for that matter).

And yes, a 295/35/20 is too wide for a 9" or 9.5" wheel for good performance.

[ellisdaniels]

Originally Posted by TP2SS

I’ve been looking for this info for awhile, 295/35 (20 over OEM) on stock 9.5 SS rears, so this is great info! What are you running on the front 8.5’s? Also 20 above OEM (265/40)? That combo (265/40 front, 295/35 rear) is only marginally larger in diameter >2 MPH @ 80MPH but gives about 1” more width. That’s about what I’d like but I was unsure about going 20 over on the wheels.

I run the stock 245/40 on the fronts right now

[ellisdaniels]

Originally Posted by Msquared

305/30/20 tires pinched onto 20x9 (I thought an SS came with 9.5" rear wheels though) may or may not rub on the fender line with its 27.2" diameter, but adding 1.6" more to the diameter will almost certainly cause rubbing.

No, 18" wheels won't make a huge difference at the track, especially if you put 29" tires on them. They won't be much, if any, wider. They will jack your rear roll centers all to hell, though, so you'll have your hands full with a pretty bad handling car. And for drag racing, the extra diameter will give you effectively a taller gear ratio. And again, your TCS and ABS will have conniption fits over the diameter difference between front and rear tires. I would strongly suggest you use 19" wheels and look at the tire sizes available for them. A 305/30/19 or even 315/30/19 would work very well on a 19x11. A 275/35/19 would work well on a 19x9 up front, but you should really look at 19x10 for better performance (or 19x11 for that matter).

And yes, a 295/35/20 is too wide for a 9" or 9.5" wheel for good performance.

I meant to put 9.5 on the ss rims my bad. But the 295/35r20s fit amazing and I can still put my hand in under the car. Maybe it’s the continental tire that’s better than others but they fit fine and the 305 was to wide the 295 is dead flat perfection.