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This is my initial mock up of rear tires, 15 X 32 X 16.5 Slicks, I think I need 18.5 or 20.5 wide. This is a pro street build, so the rear chassis will be completely fabricated around the tires I want to run. Probably end up with a 24" or 26" wide rear frame wells. Also the rear end will be pushed back 2-3", that will keep the 32" diameter tires "centered" in the stock wheel opening. Most people stretch the wheel opening, but due to tear drop shaped wheel opening on these cars it wouldn't look right. But 2-3" inches back will put a 32" tire stretching from the front starting point to the rear tip of the wheel well.
 

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Only way to know how big you can go before you destroy a tire and wheel combination that is too big is to measure how much room you have with this cheap tool (much cheaper than buying a new tire):

https://www.summitracing.com/parts/php-01201

Don't forget that your rear end moves side to side as it rotates in an arc fore and aft while going from full compression to full extension.

Or you can believe what some unknown person says on the internet that tells you he is running a 33 inch tall 18 inch wide 15 inch tire on the back of his car and he forgets to mention that he back halved his car with 24 inch centered 3x4 inch rectangular steel tube frame rails on a full four link system. Try it without full wheel tubs and a back half kit and you will have wrinkled fenders and two very expensive flat tires.

Big Dave
 

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This is my initial mock up of rear tires, 15 X 32 X 16.5 Slicks, I think I need 18.5 or 20.5 wide. This is a pro street build, so the rear chassis will be completely fabricated around the tires I want to run. Probably end up with a 24" or 26" wide rear frame wells. Also the rear end will be pushed back 2-3", that will keep the 32" diameter tires "centered" in the stock wheel opening. Most people stretch the wheel opening, but due to tear drop shaped wheel opening on these cars it wouldn't look right. But 2-3" inches back will put a 32" tire stretching from the front starting point to the rear tip of the wheel well.

Thats wild. dig it
 

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I was planning to use a 15" wheels this year, but I still went with a set of 17" KMC wheels to accommodate the tires that I'll be using for the latter part of the year. Thanks for the info about tire size though.
 
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