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Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack Specific topics relating to wheels and tires.


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Old 08-13-2018, 02:32 AM   #29
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245/40R17 for most tires are square on 17x9. It's the popular setup for SCCA STX autox class, and most competitive cars in that class also happen to look pretty good too.

You may get a slightly larger contact patch with 255/40, but it's a taller tire than 245/40R17 and 215/45R17 so you'll lose some acceleration due to effectively taller gearing.

Even though I have a set of 245/40 on 17x9 because it's optimal for my autox class, I prefer the steering feel and quicker-feeling acceleration of a narrower 215/45 or 225/45 on 17x7.5 or 17x8 for daily street use. It also feels more fun.

FWIW, I think you're putting in way more thought than what's needed in saving a few pounds in your street-driven car's wheel and tire setup. If you're not trying to find tenths and hundredths of a second on a track or autocross, pick a wheel with a size and offset that looks good (to you) with your desired ride height and camber settings, get a tire that's suitable for what you're doing with your car, and just enjoy driving it.
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Old 08-13-2018, 03:47 AM   #30
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Originally Posted by AFRichZC6 View Post
245/40R17 for most tires are square on 17x9. It's the popular setup for SCCA STX autox class, and most competitive cars in that class also happen to look pretty good too.

You may get a slightly larger contact patch with 255/40, but it's a taller tire than 245/40R17 and 215/45R17 so you'll lose some acceleration due to effectively taller gearing.

Even though I have a set of 245/40 on 17x9 because it's optimal for my autox class, I prefer the steering feel and quicker-feeling acceleration of a narrower 215/45 or 225/45 on 17x7.5 or 17x8 for daily street use. It also feels more fun.

FWIW, I think you're putting in way more thought than what's needed in saving a few pounds in your street-driven car's wheel and tire setup. If you're not trying to find tenths and hundredths of a second on a track or autocross, pick a wheel with a size and offset that looks good (to you) with your desired ride height and camber settings, get a tire that's suitable for what you're doing with your car, and just enjoy driving it.
Can't enjoy heavy twin.
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Old 08-13-2018, 08:20 AM   #31
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245/40R17 for most tires are square on 17x9. It's the popular setup for SCCA STX autox class, and most competitive cars in that class also happen to look pretty good too.

You may get a slightly larger contact patch with 255/40, but it's a taller tire than 245/40R17 and 215/45R17 so you'll lose some acceleration due to effectively taller gearing.

Even though I have a set of 245/40 on 17x9 because it's optimal for my autox class, I prefer the steering feel and quicker-feeling acceleration of a narrower 215/45 or 225/45 on 17x7.5 or 17x8 for daily street use. It also feels more fun.

FWIW, I think you're putting in way more thought than what's needed in saving a few pounds in your street-driven car's wheel and tire setup. If you're not trying to find tenths and hundredths of a second on a track or autocross, pick a wheel with a size and offset that looks good (to you) with your desired ride height and camber settings, get a tire that's suitable for what you're doing with your car, and just enjoy driving it.
I find the gearing thing not very enjoyable. The MY17 86 already has shorter gearing so I have to shuffle through the gears fast to get up to speed. It's this frantic pacing that gets tiring as hordes of crossovers and sedans with CVTs are on my ass immediately. I live in a big city and people have no patience so I have to get up to 20 over the speed limit asap lol. Smaller diameter tires make that harder, which is what I noticed when I had the OEM rims with a 215 section tire. I much prefer the 18" with a 225 section tire. It may impact acceleration but not to a degree I'd notice. But I do notice that I don't have to shift as frantically now due to an increase in the overall diameter. This is why I said that if I were to switch to a 17" wheel to save weight, I'd still want to maintain the same overall diameter. BUT since that compromises the weight savings and makes it not really worth it in the end, I'll stick with the 18s

And that's the gist of my presentation. The post was also partially like a PSA cause I noticed a lot of people here bragged about lighter 17" wheels but then they have fat heavy tires and may not know.
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Old 08-13-2018, 12:14 PM   #32
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Aside from just looks vs performance, I have meaty tires mainly to help with the shitty roads in NYC lol. Running 17x9 RFP1s with 255/40 tires. Absolutely not for performance because honestly, I don't track my car and I'm not gonna pretend I do.
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Old 08-13-2018, 12:36 PM   #33
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Aside from just looks vs performance, I have meaty tires mainly to help with the shitty roads in NYC lol. Running 17x9 RFP1s with 255/40 tires. Absolutely not for performance because honestly, I don't track my car and I'm not gonna pretend I do.
Does it improve ride quality? Cause that's one of my problems as well. I have coilovers and have to play with tire pressures to make the ride tolerable.
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Old 08-13-2018, 01:13 PM   #34
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Does it improve ride quality? Cause that's one of my problems as well. I have coilovers and have to play with tire pressures to make the ride tolerable.
I went from stock suspension + wheels to Tein Monosports + RPF1 on 255/40. This was like two years ago so I can't be sure, but I don't remember the car feeling any worse in terms of ride comfort. I think the two balanced each other out.

Impossible to compare the two directly in terms of going over potholes and whatnot since I'd have to find the exact same potholes. But I really do think it helps with that. Between the thicker walls with more air to absorb impact and the wider tires to help me just drive over some potholes or at least avoid enough of the pothole so that I dont fall into it.
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Old 08-15-2018, 01:42 PM   #35
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Are you turbo'd or sc'd?
I was supercharged with a c38 running on e85. I'm now turbo'd with a gtx2860r and making more power than the supercharger.
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Old 08-15-2018, 02:44 PM   #36
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I was supercharged with a c38 running on e85. I'm now turbo'd with a gtx2860r and making more power than the supercharger.
reason I'm asking is an sc has a more linear power delivery, so I'm assuming traction shouldn't be as much of an issue as it would be with a turbo. Could be wrong. Could depend on what kind of sc and the tune of course
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Old 08-15-2018, 04:56 PM   #37
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reason I'm asking is an sc has a more linear power delivery, so I'm assuming traction shouldn't be as much of an issue as it would be with a turbo. Could be wrong. Could depend on what kind of sc and the tune of course
It's actually the other way around. the supercharger had so much power down low I couldn't really floor it from the start. The turbo does take a second or so to actually get going. I actually prefer the turbo setup too over the supercharger. It's more efficient (comparing the compressor maps). On 14psi on the supercharger I am no where near as fast as I am now with 10psi on my turbo.
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Old 08-15-2018, 05:33 PM   #38
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18x9.5

Will 18x9.5+35 offset work on stock Scion FR-S. Mainly Iím thinking the front of it will work. I have some people say not unless you have coil overs and some say that it can work without them. Has there anyone that has tried to do this
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Old 08-15-2018, 06:38 PM   #39
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It's actually the other way around. the supercharger had so much power down low I couldn't really floor it from the start. The turbo does take a second or so to actually get going. I actually prefer the turbo setup too over the supercharger. It's more efficient (comparing the compressor maps). On 14psi on the supercharger I am no where near as fast as I am now with 10psi on my turbo.
Yeah I hear you. I had a turbocharged car before though, and for various reasons, would prefer to try an sc this time. Hear a lot of good things about edelbrock. Just waiting for them to release the updated MY17 version. If that doesn't work out, I'll go JDL turbo
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Old 09-04-2018, 01:05 PM   #40
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FWIW, I just went from stock wheels and tires to Apex 17x9's with Firestone 245's and lost .6lb per corner.
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Old 09-04-2018, 01:28 PM   #41
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FWIW, I just went from stock wheels and tires to Apex 17x9's with Firestone 245's and lost .6lb per corner.


Nice! Firehawk Indy 500 wide oval? how do you like the tires?
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Old 09-04-2018, 04:08 PM   #42
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Firestone’s were not worth a damn until Bridgestone bought them out in 1990. Good luck. I’d like to know how they hold up as well Keep us posted.
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