New guy ... more questions ... wheels and offsets

Discussion on wheel & tire issues
BigMike0147
Posts: 19
Joined: Sun Jan 21, 2018 8:06 pm

Re: New guy ... more questions ... wheels and offsets

Post by BigMike0147 »

I know this is an ancient thread, but did anyone ever try the 245/40/r20 tires in the front. I'm getting some in and I'm concerned they may not work. It seems like everyone is hesitant to go that tall.

Taking measurements seems like it should work as the tire will only protrude "outward" less than 1/4" from the factory size (< 1/2" total OD change). However, I'm curious to see how much a change in wheels and offset may play a factor in this. It looks like bsparks might have had an idea, but I'm not sure if it was ever tested. Thanks in advance for any feedback anyone can give.
bsparks72 wrote:I will agree that 245/45/20 is too big (tall) for the front. When I got my car, the tires had been replaced with 245/55/18 RSAs on stock wheels. Those have a 28.61 overall tire diameter. The front tires rubbed on the struts where the spring sits. And I don't mean a little...it ruined the tires quickly. I ditched the ruined 2, sold the other 2 and put stock size tires back on. Go look at your car stock, and see how little room there is between the front tires and the struts where the spring pocket is. I'd say anything over about 28" diameter is getting close to rubbing.

A 245/45/20 has an overall diameter of 28.68, which is slightly taller than what I had. No way that will work. You either need a 245/40/20 on the front, or a 255/35/20 - which oddly enough is less expenive tire to tire in a lot of cases. The 245/40/20 is slightly taller than the stock 235/50/18, and the 255/35/20 is slightly shorter than stock.

As for the rear, a 275/35/20 is closer to the stock overall tire diameter than a 275/40/20 is. I have stock Camaro 20s in the garage. I plan on trying 255/35/20 front, and 275/35/20 rear. If you want to do tire comparisons, this is among the friendlier tire calculators I've found:

https://www.tacomaworld.com/tirecalc" onclick="window.open(this.href);return false;
Oldblue68chevy
Posts: 46
Joined: Sun Aug 20, 2017 7:06 pm

Re: New guy ... more questions ... wheels and offsets

Post by Oldblue68chevy »

I just put 245/40/20 on the front of mine no issues with them. These are on camaro wheels.
2011 PPV 9C3
Navy Lifer
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Re: New guy ... more questions ... wheels and offsets

Post by Navy Lifer »

Oldblue68chevy wrote:I just put 245/40/20 on the front of mine no issues with them. These are on camaro wheels.
Need to be more specific--what year, width, and offset on which "Camaro" wheel?

10-15 Camaro 20" front - 8" width, +35mm offset

16-newer Camaro 20" front - 8.5" width, +25mm offset
Oldblue68chevy
Posts: 46
Joined: Sun Aug 20, 2017 7:06 pm

Re: New guy ... more questions ... wheels and offsets

Post by Oldblue68chevy »

Sorry these are 2010 camaro 20x8 with the +35mm offset. Attached pic of the wheel. Thought i had pics of them on the car. Will update when I take a pic.
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2011 PPV 9C3
BigMike0147
Posts: 19
Joined: Sun Jan 21, 2018 8:06 pm

Re: New guy ... more questions ... wheels and offsets

Post by BigMike0147 »

Thanks for the follow-up guys. This makes me hopeful for my setup. My specs are below. I can see about posting pics once I get everything together. It may be a bit because I'm going to do a rear swap before I put my trans back in.

20x8.5 (front) +35 with 245/40/20 tires
20x9.5 +45 with 275/35/20 in the back
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