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Tracking / Autocross / HPDE / Drifting What these cars were built for! |
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04-27-2023, 09:21 AM | #1 |
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Tire and Wheel Combination | Video
Surprisingly good video from Tire Rack, featuring a 2022 BRZ. |
05-17-2023, 09:56 AM | #2 |
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Nice video indeed. And interesting findings.
I’m running 245s on a 9” wheel. Been thinking about getting a second set of wheels/tires. Might give 9.5” with 245s a try. And when it comes time to replace the tires on the 9”, I might go with 225s to see how they feel. Question is, should I stick with 17” or move up to 18”? Been having brake issues. Just upgraded to 325mm BBK, but might have to move up to 340+mm which would require 18” wheels. Decisions. |
05-17-2023, 12:50 PM | #3 | |||
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You have to keep other things in mind. 17" offers enough sidewall that the tire isn't going to feel sloppy like a 16" with a 55 series sidewall, but the 18" is going to start adding more weight to the wheel. Generally the crossoverpoint in terms of weight in 17-18 inches in tire because 18" tires sometimes have more or the same weight as 17", but the 18" wheel can be heavier than 17. In general, track guys looking for weight savings generally stick to 17". Tire sizing with width, given the wheel is wide enough, the 245 is going to be faster. Remember that the course this is being tested on is more of an autocross style course. I'd still prefer 245's for autocross. It would really be coming down to the feel of the tire making the driver's faster and pushing more. I'd still edge that given the actual lap times are so close between 225 and 245 on the 9", 245 is probably going to come out on top at a larger circut style track. 245 is the go-to for STX on a 9" wheel for these cars, tried and tested over years. No one is running a 225 on 9" because it magically is faster. Quote:
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Point is, any braking issues you're seeing on a light BRZ aren't going to be fixed increasing brake size like this. It's probably more pad related or perhaps even tire related. I don't think this is necessary at all, especially for the cost.
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05-17-2023, 01:47 PM | #4 | |
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05-17-2023, 01:59 PM | #5 | |
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(I had beers with your old autocross buddy Kyle a couple weeks ago. Seeing him at the NASA event this weekend too. )
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05-17-2023, 03:33 PM | #6 |
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265 on 18’s trophied last year and is likely a contender to win.
245/40/17 on 17x9 is lemming effect, not proven imho, but because nobody has been playing around us lemmings are safe to stick to what we know. Tire racks test has me interested in trying 225 on a 9 but it’ll probably be post nats for me. |
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05-18-2023, 10:56 PM | #7 |
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I'm in the situation of picking tires for 9" wheels right now and this sizing question is throwing more variables into the mix. And then I wonder how a 235/40 or 45 would do.
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05-19-2023, 08:58 AM | #8 |
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Had an interesting data point that matches their results at our autocross event.
I run a 225/45/17 in DS on a first gen. The idea is to run the stock wheels because once I go STX, I'll get wheels then. Most others guys with gen 2's are running 245's, different offsets, etc. We have about 5+ gen 2's running all the time. It rained and on 225's I was ahead of all of them by a large margin. I guess there's some truth in TR's results that running a ~225 in the wet might be more beneficial than cramming a 245 on a 7.5". I still think in the dry a 245 is better. They all creamed me once it dried up.
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05-19-2023, 09:55 AM | #9 |
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Another interesting bit about the tires they tested. The 225s are have an "XL" load category and are rated for more weight than the 245s, which are "SL". Not sure what that actually means in terms of tire structure, but that might have something to do with the results.
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05-19-2023, 10:28 AM | #10 |
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I sorta agree, I think a good amount of it is also specific to a tires particular characteristic. 245/40 seems to be a pretty safe choice in all brands. I have ran 235 in the Z3 and SX2 and liked them in that size. Also keeping in mind that not all tires measure out the same to what is printed on the sidewall.
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05-19-2023, 11:45 AM | #11 | |
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05-20-2023, 01:38 PM | #12 | |
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A lot of what people recommend and do is based on anecdotal evidence. 245s on 9s appear to be a very good combo and may actually be the optimal tire/wheel setup, but unless we have objective studies similar to the TR test, it’s hard to say which one is the best combo for sure. The TR test shouldn’t be accepted as canon, but it at least warrants consideration. I don’t think it is conclusive that 245 on 9 is the best option for track/autocross duty. It also isn’t a bad combo. Btw, the TR test wasn’t about the best combo for a GR86. It was just about the best tire and wheel width combo for 225s and 245s. It is possible our cars do even better with 265s on something else. It’d be sweet to have TR’s resources and do tests all day to figure out the best option for the 86/BRZ. |
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05-23-2023, 03:44 AM | #13 | ||
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