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I'm running 18x12 rears with a 1" spacer and long studs. I could fit 13" easily but the 12" give me more tire choices, it's in the recommended range for 315 & 335 rcomps as well as several slicks. I race on a budget and want to have a lot of options in case I can score a deal on used tires. I also want to be able to run long lasting tires (NT01) for lapping days. You have to look at tire height as well as width.
To be really competitive you need to pick the tire you plan to race on and buy the wheels accordingly. Are you going to be on slicks or R-comp? Are there rules that limit or penalize wheel size? How much does the car weigh (with driver) and how much power will it have? How low can you get it in the rear with a tall tire?
Everyone loves big tires but the fastest cars I've seen with a set-up like yours are running slicks in cup car widths (240/280). With lighter cars and medium power you may not get the heat into the big tires, especially the fronts. If you aren't racing for wins in a competitive series you can go wide and get a longer life out of your tire, you'll be sacrificing some speed though.
Lets see some more pics of your project too, looks cool!
Last edited by Cory M; 01-28-2014 at 07:37 AM..
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