RPF1 17x8 +35 on stock suspension?

[1Cor10:23]

Hi all,

Wondering if anyone has a setup with 17x8 +35 RPF1s on completely stock suspension?

Leaning toward this direction but open to community suggestions on width and offset...

I have a bias toward performance over aesthetics.

Thanks!

[xwd]

I'd look at the 17x9 +35/+45 RPF1 threads since it will be similar depending on the tire size you plan on using. 17x8 +35 will certainly fit fine. Some say the 17x9 +35 "poke" out a little due to the extra 10mm of offset.

[chriscross_tnt]

Originally Posted by 1Cor10:23

Hi all,

Wondering if anyone has a setup with 17x8 +35 RPF1s on completely stock suspension?

Leaning toward this direction but open to community suggestions on width and offset...

I have a bias toward performance over aesthetics.

Thanks!

I wanna go 17x8 . I'm having trouble deciding what offsett to go aswell. 17x8 with a 245/40/17 tire would be amazing for autocross. Anything wider than 17x8 you starts killing the handling performance

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[fatoni]

Originally Posted by chriscross_tnt

I wanna go 17x8 . I'm having trouble deciding what offsett to go aswell. 17x8 with a 245/40/17 tire would be amazing for autocross. Anything wider than 17x8 you starts killing the handling performance

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yeah i dont think theres much truth to what you just said. if a 9 inch rim doesnt hurt a 2100 lb 90 hp miatas handling i dont see how its too much for this car. whats hurting the cars performance might be the 245 tire

[1Cor10:23]

I'm open to 9" as well for the better look of the wheel but cognizant of the handling drawbacks as mentioned above...

If going with 17x9 +35, any issue of the fender coming down on the tire at full load given the amount that of poke?

Completely stock setup, of course.

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[Zach3794]

I have RPF1's in 17x8, +35 configuration on 235/45-17 Continental Extremecontact "DW" tires. With good driving on this setup, the limits of grip are ridiculously high. Naturally, driving with intent to lose grip or not realizing you're driving that way, and the tires will not grip as well, just like every other offering out there. Oh and this setup sits perfectly flush with the fender.

[1Cor10:23]

Originally Posted by Zach3794

I have RPF1's in 17x8, +35 configuration on 235/45-17 Continental Extremecontact "DW" tires. With good driving on this setup, the limits of grip are ridiculously high. Naturally, driving with intent to lose grip or not realizing you're driving that way, and the tires will not grip as well, just like every other offering out there. Oh and this setup sits perfectly flush with the fender.

any pics? thanks!

[chriscross_tnt]

Originally Posted by fatoni

yeah i dont think theres much truth to what you just said. if a 9 inch rim doesnt hurt a 2100 lb 90 hp miatas handling i dont see how its too much for this car. whats hurting the cars performance might be the 245 tire

I didn't specifically mean 9 inch rim. But yes as you go bigger it will effect. Put at 10 inch rim and go see how it works out. 245 tire is a great tire for autox . You also don't wanna stretch it too much cause that will affect aswell. That's Why I said a 17x8 and 245 is a good combo. My personal preference beat results I had .

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[Zach3794]

Originally Posted by 1Cor10:23

any pics? thanks!

I will post pics later today for you but just as an fyi the car isn't stock suspension wise any longer. These wheels and tires were used on stock suspension for a long time with no issue, but they are now dropped on H&R Super Sports. Still, will post pictures for you

[fatoni]

Originally Posted by chriscross_tnt

I didn't specifically mean 9 inch rim. But yes as you go bigger it will effect. Put at 10 inch rim and go see how it works out. 245 tire is a great tire for autox . You also don't wanna stretch it too much cause that will affect aswell. That's Why I said a 17x8 and 245 is a good combo. My personal preference beat results I had .

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i get the concept. i also understand that 9 inches is 228mm so i dont know how it would be stretching a tire that is 245. rim size isnt as important in autocross because you are likely using a race tire with incredibly strong sidewalls but a wider rim will be beneficial for people who dont want to drive around on r comps. another advantage is that there is more air volume inside the tire keeping tire temps more stable. not too noticeable in a 40 second course but if the op ever plans to see a road course it will be a huge deal. 17x9 wrapped in a 224/45 is probably going to be the sweet spot for this car.

[1Cor10:23]

Originally Posted by Zach3794

I will post pics later today for you but just as an fyi the car isn't stock suspension wise any longer. These wheels and tires were used on stock suspension for a long time with no issue, but they are now dropped on H&R Super Sports. Still, will post pictures for you

If you had to do over again, would you still go with the 8" width? I think this is my main debate now..8 vs. 9 and the aesthetic differences with the design

[fatoni]

Originally Posted by 1Cor10:23

If you had to do over again, would you still go with the 8" width? I think this is my main debate now..8 vs. 9 and the aesthetic differences with the design

9s will be faster in almost every instance imo but then you will be married to a wider tire. the 8s will be cheaper and might have more tire choices.

[Zach3794]

In auto cross id agree that a 9 inch would be faster but the majority of the track guys on here at NA power (and Robi who is supercharged) are in consensus on an 8" wheel and either 225 or 235 wide tire.


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[fatoni]

Originally Posted by Zach3794

In auto cross id agree that a 9 inch would be faster but the majority of the track guys on here at NA power (and Robi who is supercharged) are in consensus on an 8" wheel and either 225 or 235 wide tire.


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i find that odd. what advantage does an 8" rim have over 9" rim at the same tread width. the only differences i see are less sidewall strength, less responsivveness, higher tire pressure, and maybe an insignificant weight loss. im open to opinions