FWIW, what temperature range, and is rain a concern?

On size...some of the max-performance 205s are larger than "normal" 205s. Between running wide for the tire wars and having squarer edge profiles.

I prefer to see Miatas running the same wheels/tires front and rear.

 

I'd do a 15x6.5 in the front with a 195, and a 15x9 in the rear with 275 racing slick, and no front sway bar. This is for fastest lap times.

 

I run 205/50-15r RE-11s with out any cornering or traction problem in my 349whp NB.

 

FWIW, I am using 225/40/16 T1Rs on 16X7 wheels. The offset is 40mm I believe.

The 1.3% (or so) diameter increase makes up for the optimistic speedo error, and the car handles much better than the 195/50/15 setup I used to have.

And, I no longer leave 20 foot skid marks on the freeway when I hit the gas in 4th gear.

 

The best size for fun fast road use are standard sizes, 14x6 or 15x6.5 with good tyres.

 

You said ROAD USE.

Honestly for backroads you want a lightweight combo for compliance and grip over bumps, more than outright max cornering G's.

And, 195 or 205 tires are a lot cheaper than 225's.

35 mm offset will give you less steering wheel jerking on bumps than a smaller offset.

I suggest lightweight 15x7 rims with 195 tires, or 15x7.5 with 205's.

R1R class tires have more grip than you ever "need" on the street; RA1's if you want even more than that. Softer sidewalls grip better on ripply pavement.

I use 9.5 lb 15x7 Comp SSR's and 195/50/15 RE-01's on the street. The 6ULs with 225's are for track and autox.

 

I've noticed with a stock powerd car, my 225/45/15 RS-3's stuck like glue, and made the car seem down on power since it would never get out of shape.

So that's why it's getting some serious power upgrades