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AutoX Tire/Wheel Choice

Old 10-26-04, 08:27 PM
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AutoX Tire/Wheel Choice

I plan on autocrossing my NA 89 RX-7 this up coming season. I am looking for opinions as to which of 2 tire and wheel choices would be most beneficial. I'm not interested in being in a particular class, just my time vs. others. I don't care about classification rules.

Choice 1 : Stock 15*6 (16 lbs) with 225/50/15
Advantages: Lower gearing due to smaller diameter
Reduced tire weight
Disadvantages: Narrow wheel

Choice 2 : SSR 17*7.5 (14 lbs) with 225/45/17
Advantages: Larger overall contact patch
Less wheel weight
Wider wheel
Shorter sidewall
Disadvantages: Taller gearing
Higher tire weight

I think the reduced weight and lower gearing of the 15" combo is my best bet despite the narrow wheel. Tips? Advice? Thanks in advance.
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Old 10-26-04, 11:07 PM
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I would suggest splitting the middle...

Maybe go with 15*7 front, with a 15*8 rear... Watch the offsets to prevent rubbing issues.

I'd probably go 205/50 on front and 225/50 on the back... Pretty decent contact patch, and since NA's don't have an abundance of torque, the reduced unsprung weight (if you wheel-shop wisely...) will definitely help accelerating out of corners.

With a relative lack of torque, it's possible to over-tire the car... You need a little wheelspin at the start to keep the engine from bogging, and you can actually use a slight lack of grip from a not-so-wide tire to help the car rotate thru tight turns.

For wheels, you can pick up pretty cheap, light wheels from Kosei, Rota and a couple others.

Hopefully I haven't sent you down the wrong road... This is just some stuff I figured out on my 88 GTU before I blew it up...

Good luck, and have fun!!!
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Old 10-27-04, 06:59 AM
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If you're only concern is outright laptime your choice is simple. Get the widest wheels with the widest rubber that will fit. Wider tires will outrun narrower tires everytime.
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Old 10-27-04, 01:10 PM
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check out diamond racing wheels. they are cheap so you can buy a couple of sets and see what you like. and they are descently light. i'm autoxing with 13x7's on my fb with some STICKY tires and i have no complaints. they are kinda old school style, i haven't seen any on a FC but i have seen numerous on fb's and they look great if you get the right style.

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