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Hey Challenger pilots, want to get some opinions. 2months ago I bought a 2010 SRT8, and plan on a lot of autocross and a few road courses a year. The car came with the stock 20X9 aluminum rims and it has 245/45R Falken street tires on it. I already purchased a BC coilover setup, rear sway bar, and front and back strut tower braces for it. What I'm trying to figure is if it'll be good/necessary to change wheel size, for running a set of treadwear 200 tires on it. I'd really appreciate some experienced voices here. Thanks! And I'm glad to be on the site!
 

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Yeah i would go as far to say try and fit the widest tire size possible on a 9” wheel , your looking into a 275/somethinsumtin

Probably dont want to put a different size in the rear, keep all 4 identical

And if your REALLY going for it and dont mind shredding corners off your tires early, you can look into some upper front controll arms to get an aggressive alignment.
 

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I ran factory 245s all around at my first event. I bought some Scat Pack replica 10.5 wheels and put 295s on them, but they rubbed the knuckle in the front. So then I have been running staggered past 2 months, 9" front wheels with 275s and the 295s on the rear. Kumho's. This is not a bad set up because it forces understeer. The Kumho Ecstas are not bad, price wise not bad. I've got 10 runs on them so far. However, I am participating in NASA and I eventually want to run American Iron. That limits you to 18" wheels. I've not found any decent width of 18" tires, that is anywhere close to the stock height. In a way that is good because it helps me with gearing, but I'd really like to get closer to what I have running the 245s or 275s on 20's. And I'd prefer to run square.
 

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I ran factory 245s all around at my first event. I bought some Scat Pack replica 10.5 wheels and put 295s on them, but they rubbed the knuckle in the front. So then I have been running staggered past 2 months, 9" front wheels with 275s and the 295s on the rear. Kumho's. This is not a bad set up because it forces understeer. The Kumho Ecstas are not bad, price wise not bad. I've got 10 runs on them so far. However, I am participating in NASA and I eventually want to run American Iron. That limits you to 18" wheels. I've not found any decent width of 18" tires, that is anywhere close to the stock height. In a way that is good because it helps me with gearing, but I'd really like to get closer to what I have running the 245s or 275s on 20's. And I'd prefer to run square.
What year and model car do you have?

Sent from my SM-S907VL using Tapatalk
 

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275/45R18. Bridgestone just started manufacturing this size in the s007A and I believe it give you the 27” OD to match a factory 245/45R20

I recently purchased them and they as suuuuper sticky and just tested then at the canyon yesterday. Pretty insane grip.

Cons are they are asymmetrical making dismount rotating impossible


 

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245/45-20 are 28.7" diameter
275/45-18 are 27.7" diameter, an inch shorter

The math is (width*aspect ratio/100*2)/25.4 + wheel diameter

Or (275*45/100*2)/25.4+18 = 27.74
 
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