[Fd2blk78]

Quick question. I didn't want to spend 700 dollars a tire on my 08 srt. So I bought some Atturos for the Jeep. Ordered the rear tires (stock size, 285\40r20) no problem, then realized that they don't make the 255\45r20 for the front. So I bought some 255\50r20's instead. I haven't installed them yet. But will this cause any problems? Any help would be greatly appreciated. Thanks friends.

 

[mrpickels64]

Using a tire size calculator, the front tire will be about an inch taller than the rear. 672 revolutions per minute compared to 696. Our transfer cases are very finicky with tire size. That "might" be close enough, but I wouldn't do it.

 

[2quic4u]

I believe the maximum allowable tolerance is 3% between the front & rear sizes. Anything more and you will definitely end up stretching/breaking the chain inside the transfer case. According to the website I used, the difference in diameter is roughly 3.4%

 

[mrpickels64]

You are correct. 3% is the magic number.

 

[mondo]

3% is correct. Go to Atturo's site and look at the diameter on both. Dont trust a tire size calculator.

 

[2quic4u]

3% is correct. Go to Atturo's site and look at the diameter on both. Dont trust a tire size calculator.

Yes definitely use the tire manufactures website. When I had my nitto invos in the 275/315 combo, they were spot on the same size: 28.62” total overall diameter.

 

[Fd2blk78]

29 vs 30.2 inches

 

[Fd2blk78]

29 is 96.026490066225% of 30.2.

Assuming 30.2 is 100%, than it's just about 4% off, which is more than 3. Got it. Learn something new every day. Lol

 

[supersavboi187]

Quick question. I didn't want to spend 700 dollars a tire on my 08 srt. So I bought some Atturos for the Jeep. Ordered the rear tires (stock size, 285\40r20) no problem, then realized that they don't make the 255\45r20 for the front. So I bought some 255\50r20's instead. I haven't installed them yet. But will this cause any problems? Any help would be greatly appreciated. Thanks friends.

3% is correct. Go to Atturo's site and look at the diameter on both. Dont trust a tire size calculator.

so with hopped up 1000+ tcase from paramount would a 3.5% difference matter that much? Read my latest thread for the background info but thats where im at. And im a bit worried

 

[mondo]

so with hopped up 1000+ tcase from paramount would a 3.5% difference matter that much? Read my latest thread for the background info but thats where im at. And im a bit worried

I answered your question in your other thread.....

 

[mondo]

Doesn't matter what transfercase you have, nothing more than 3%.