[FlukeSS]

Originally Posted by Green82

i run 315/30/20 on the rear and do a lot of spirited driving adn my tires dont touch the felt liner at all. might be because im running a different offset than the 1LE wheel plus the shorter sidewall that makes the difference

That is why spacers are necessary with 315's. Or the offset has to account for no spacers. And yes not all tires are created equal as well.

[FlukeSS]

Originally Posted by ChinbakwaAss

Y'all thank you for the replies, this definitely helps me out, as some folks pointed out, more information is need, I currently have the stock tires and wheels(245/40R20 all round), nothing has been done to the car, it is stock.Also thanks for the correction on the wrong rear tire size,I mentioned 315 but that's incorrect. I don't track or go to drag strip but I do a lot of "spirited driving"

As I mentioned the screenshot I provided gives you a baseline what you can do.

Anything outside of that is where you need to consider spacers, offset variance, and/or moving the wire harness.

I thought the LT1's were 245 all the way around, but you can change that based on the screenshot I provided which means you'd have to change your wheel setup at the same time.

But, you might be able to get away with putting 275/35R20 on the back on the stock wheel it depends on the actual wheel size.

Normally the SS+ models have staggered wheel setups, so wider wheels on the back than front. I believe those are 9.5" wheels on the back @275/35R20. However our front wheels are 8.5" @245/40R20

I would check what your rear wheel width actually is before determining if you can put a wider tire on the back. Otherwise you may have to change out the rear wheels at minimum.

[TRUEOGRE2SS]

Originally Posted by ChinbakwaAss

Y'all thank you for the replies, this definitely helps me out, as some folks pointed out, more information is need, I currently have the stock tires and wheels(245/40R20 all round), nothing has been done to the car, it is stock.Also thanks for the correction on the wrong rear tire size,I mentioned 315 but that's incorrect. I don't track or go to drag strip but I do a lot of "spirited driving"

Anytime, picking out the correct size tire can be pretty tricky, especially with all the various heights/widths of tires, then having to pick the correct wheel size with correct offset, just stick with the 1LE spec sizes, 20x10 +23 fronts, 20x11 +43 rears, 275/35/20 & 315/35/20 will fit perfectly, like 2SS Capt said moving the wire harness is super easy (even included pics of wire harness relocation), doesn't hurt to be a little cautious when it comes to that wire harness, better to be safe than sorry, than comes that time and you say, Damn wish I would've moved that harness.

[Msquared]

Wow, there's a LOT going on in this thread. The OP isn't interested in 35 series tires, and those are going to be way too tall for good fitment or cornering/braking performance, so that's a bad recommendation. 275s on 8.5" rim widths can physically be installed, but this is a bad idea. Within reason, tire width alone doesn't require spacers...IF you have the right offsets on your wheels.

The OP said he wants to emulate SS 1LE sizing, so this is a no-brainer: as a couple have said, he needs 20x10 et20 front wheels and 20x11 et43 rear wheels. Stock tire sizes are (again as noted) 285/30/20 and 305/30/20. There is no good reason to stray from that, either. They fit, and they work extremely well. There are also a lot of tires to choose from in these sizes.

I emphatically would not recommend 275/30 in front and 315/30 in back. Aside from the fact that there's no good reason to do this, this sizing gives you a rear diameter that is 3.4% taller than the front. There's a good chance this will piss off the ABS/TCS and throw warning lights and cut power. We know you can get away with close to 3%, and I have done so by autocrossing a 275 and 305 combo. But a bigger difference than that is asking for trouble. Besides, there will be far fewer choices of tires in this size combo.

You aren't going to cook your brakes because of the tires you choose. It'll be down to how you use them and what pads you use...and fluid. If you are really, truly using them hard (like HPDE lapping sessions), then an SS 1LE brake upgrade would be good. Otherwise, you will be fine with good pads and fluid.

When it comes to actually choosing tires, if you really care about cornering and braking grip and you need tires that perform well in wet and/or cool conditions, then the only two to really consider are the Continental ExtremeContact Sport 02 and the Michelin Pilot Sport 4S. Of the two, I'd choose the Conti over the Michelin, but they are very close. These are both killer "three-season" tires, and they are the two best performing rain tires that are also true street tires. You can even use them safely for autocross and track day usage, although they won't be competitive with more competition-focused "street-but-not-really" tires. I don't know where you live and whether or not you drive the car in true winter conditions. If so, and if you don't want to swap wheels/tires for winter, then the Continental ExtremeContact DWS or Michelin Pilot Sport All Season 4 are the two to choose from. Again, they are extremely close in performance.

I would honestly move the harness even if you go with with 305/30/20 in back. As other said, it's super easy and then you just know it won't be an issue.

Feel free to ask follow-up questions!

[2SS Capt]

Originally Posted by Msquared

Wow, there's a LOT going on in this thread. The OP isn't interested in 35 series tires, and those are going to be way too tall for good fitment or cornering/braking performance, so that's a bad recommendation. 275s on 8.5" rim widths can physically be installed, but this is a bad idea. Within reason, tire width alone doesn't require spacers...IF you have the right offsets on your wheels.

The OP said he wants to emulate SS 1LE sizing, so this is a no-brainer: as a couple have said, he needs 20x10 et20 front wheels and 20x11 et43 rear wheels. Stock tire sizes are (again as noted) 285/30/20 and 305/30/20. There is no good reason to stray from that, either. They fit, and they work extremely well. There are also a lot of tires to choose from in these sizes.

I emphatically would not recommend 275/30 in front and 315/30 in back. Aside from the fact that there's no good reason to do this, this sizing gives you a rear diameter that is 3.4% taller than the front. There's a good chance this will piss off the ABS/TCS and throw warning lights and cut power. We know you can get away with close to 3%, and I have done so by autocrossing a 275 and 305 combo. But a bigger difference than that is asking for trouble. Besides, there will be far fewer choices of tires in this size combo.

You aren't going to cook your brakes because of the tires you choose. It'll be down to how you use them and what pads you use...and fluid. If you are really, truly using them hard (like HPDE lapping sessions), then an SS 1LE brake upgrade would be good. Otherwise, you will be fine with good pads and fluid.

When it comes to actually choosing tires, if you really care about cornering and braking grip and you need tires that perform well in wet and/or cool conditions, then the only two to really consider are the Continental ExtremeContact Sport 02 and the Michelin Pilot Sport 4S. Of the two, I'd choose the Conti over the Michelin, but they are very close. These are both killer "three-season" tires, and they are the two best performing rain tires that are also true street tires. You can even use them safely for autocross and track day usage, although they won't be competitive with more competition-focused "street-but-not-really" tires. I don't know where you live and whether or not you drive the car in true winter conditions. If so, and if you don't want to swap wheels/tires for winter, then the Continental ExtremeContact DWS or Michelin Pilot Sport All Season 4 are the two to choose from. Again, they are extremely close in performance.

I would honestly move the harness even if you go with with 305/30/20 in back. As other said, it's super easy and then you just know it won't be an issue.

Feel free to ask follow-up questions!

Maybe I missed it but I didn't see any recommendations for 275/30 & 315/30, However 275/35 & 315/30 would give you nearly identical stock SS (non-1LE) tire diameters...

[Crushin_LT1]

Originally Posted by Msquared

You aren't going to cook your brakes because of the tires you choose. It'll be down to how you use them and what pads you use...and fluid. If you are really, truly using them hard (like HPDE lapping sessions), then an SS 1LE brake upgrade would be good. Otherwise, you will be fine with good pads and fluid.

Feel free to ask follow-up questions!

Wait, can you do an SS 1LE brake upgrade on an LT1? I thought that basically meant selling the LT1 and getting a 1SS or 2SS?

[david_acm]

Originally Posted by Crushin_LT1

Wait, can you do an SS 1LE brake upgrade on an LT1? I thought that basically meant selling the LT1 and getting a 1SS or 2SS?

As far as I know, you can only upgrade the front brakes on an LT1 unless you don't care about the e-brake functionality in the rears.

[arpad_m]

Originally Posted by Crushin_LT1

Wait, can you do an SS 1LE brake upgrade on an LT1? I thought that basically meant selling the LT1 and getting a 1SS or 2SS?

The fronts you can definitely upgrade, and they do 75% of the work anyway. The rears may be problematic because of the different parking brake setup, but I'm not very familiar with the details of the LT1 rear brake configuration.

[Crushin_LT1]

Originally Posted by arpad_m

The fronts you can definitely upgrade, and they do 75% of the work anyway. The rears may be problematic because of the different parking brake setup, but I'm not very familiar with the details of the LT1 rear brake configuration.

That is a good point Arpad... but at what point do we need to worry about flipping over the handlebars, like with a bike?

[arpad_m]

Originally Posted by Crushin_LT1

That is a good point Arpad... but at what point do we need to worry about flipping over the handlebars, like with a bike?

Well played, Sir

...but just in case this wasn't a joke, don't worry, there are no front brakes in existence, be them the SS 1LE or even the massive ZL1 1LE units that could stop the car fast enough to flip it.

I think the max braking deceleration you can achieve is ~1.5 g, nowehere near enough to lift the rear of the car, plus you have ABS, plus the rear brakes do contribute some, this doesn't work like a bicycle.

[Msquared]

Originally Posted by 2SS Capt

Maybe I missed it but I didn't see any recommendations for 275/30 & 315/30, However 275/35 & 315/30 would give you nearly identical stock SS (non-1LE) tire diameters...

It was part of the original post.

Originally Posted by arpad_m

...but just in case this wasn't a joke, don't worry, there are no front brakes in existence, be them the SS 1LE or even the massive ZL1 1LE units that could stop the car fast enough to flip it.

I think the max braking deceleration you can achieve is ~1.5 g, nowehere near enough to lift the rear of the car, plus you have ABS, plus the rear brakes do contribute some, this doesn't work like a bicycle.

Just to add to this, the tires stop the car (and accelerate and turn it, too). The brakes stop the wheels, the wheels stop the tires. There's no tire on the planet that could generate the grip required to flip the car over. The required grip is a function of CG height and wheelbase. The reason it's so easy to do stoppie on a bicycle or motorcycle is because the wheelbase is so short and the CG is much higher than that of most cars.