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View Poll Results: which rim size should I go with
17x8.5 22 70.97%
18x9 9 29.03%
Voters: 31. You may not vote on this poll

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Old 05-31-2019, 07:27 AM   #15
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strat61caster hit the nail on the head when he mentioned it is all driven by brakes. Find the brakes you need for whatever you are doing and then find the smallest best tires and wheels that will fit over them. Lighter is always better, and if you are doing any type of track driving, the least expensive consumables are also a good idea.

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Drive car hard, replace tires often, 17" tires cheaper than 18" tires, 17x9 is a standard wheel sizing for 245/40/17 (driven by SCCA and TT rulesets, trickle down effect from people copying fast guys in those realms), that tire works on an 8.5" wheel just fine. Go down to a 17x8 for a cheaper 225/45/17 tire, but I think that'd be too stretched on an 8.5" wheel, it'll work, just preferences. 17" wheels are usually cheaper than 18's too. 235's aren't common to split the difference, especially in fast tire compounds, uncommon tire = expensive tire.




It is less of an issue this decade, pushing for larger diameter wheels offered a lot of performance advantages in the past, it wasn't so long ago that 14" was a 'sporty' wheel (the Miata came on 14" wheels up to the launch of the NB when they were replaced with 15's, the AP1 S2000 had 16's) but we're in a sweet spot right now with most cars offering/accepting 17"-19" wheel options that work great.

Shorter stiffer sidewalls respond faster and more consistently, I believe back in the day before radials were common the lower profiles offered better stability at high speeds. Larger wheels also mean more space for larger brakes which in the early days of discs meant more thermal capacity, stop better = faster laptime.

There's a balance to strike, the car was designed around a 17" wheel with a ~24.7" diameter tire, messing with that formula may make the car feel 'off' as now the bushings, suspension, and chassis are working harder to compensate for the reduced tire flex. It could be worth it if you're going down the well of making your car faster but it sounds like you're just getting started so stick with the 17's imho, spend the money on seat time.
The car was designed around 16x7 wheels with 205/55 sized tires. Only the USA gets 17" wheels I believe.
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Old 05-31-2019, 11:07 AM   #16
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strat61caster hit the nail on the head when he mentioned it is all driven by brakes. Find the brakes you need for whatever you are doing and then find the smallest best tires and wheels that will fit over them. Lighter is always better, and if you are doing any type of track driving, the least expensive consumables are also a good idea.



The car was designed around 16x7 wheels with 205/55 sized tires. Only the USA gets 17" wheels I believe.
Looks like the 16"x6.5" wheels are base model wheels, you don't get an LSD with those so idk if the car is "designed around them" but Fair point that they are standard and on many frz86s, really 18 is for looks at this point for this platform. Seems like a cost and comfort option along with "you're going to buy your own wheels anyway" which was the point of the RA

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Old 05-31-2019, 04:53 PM   #17
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The car was designed around 16x7 wheels with 205/55 sized tires. Only the USA gets 17" wheels I believe.
All the 86's I drove in Japan had 17's. They offer 16's on the base model, and the JDM BRZ has offered 18's for a while on the tS and STI sport.
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Old 08-12-2019, 11:04 PM   #18
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*Update, placed an order for the volk te37 SL in a custom size of 5x100 17x9 square setup.
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Old 08-13-2019, 01:07 PM   #19
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I have 17x8 RPF1s on my car with Michelin PSSs and have never had any traction problems with a stock engine.
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