The ND Generation MX-5 returns to 4x100 lug pattern. Stock tire sizes are 195/50/16 on 16x6.5 and 205/45/17 on 17x7... which means the stock tire diameters range from 23.6 to 24.3 inch. Within that range there are interesting upgrade sizes to consider. TPMS operates off ABS system with the ND, that means NO sensors in the wheels to worry about when changing to another wheel.
195/50/16 tire size fits within the fenders on wheels down to about 32mm offset. For customers seeking more performance in 16 inch sizes consider 205/50/16 up through 225/45 on 16x7 and 16x8 wheels with higher offset.
With stock size 205/45/17 tires you can run offsets as low as 40mm and still fit in factory fenders with 1 degree negative camber or better, we have run 38mm with more camber.
An easy upgrade in 17 inch is 215/45/17 and that fits with our wheel choices that are 42mm to 50mm offsets.
MAX TIRE SIZE that will fit in stock fenders without a fender roll is 235/40/17 using our Advanti Racing, Konig HyperGram, and 6UL Racing Wheels in either 17x8 or 17x9, as long as you have about 1.5 degrees of negative camber or more. For street use we strongly suggest 8 inches as max wheel width, when used with 235/40/17 tire that gives some curb rash protection and comfort with a big increase in grip compared to stock. If the car is lowered and/or raced, this size may slightly rub the plastic fender liners inside the wheel well at full steering lock and/or over big bumps/dips in turns depending on alignment settings, particular brand/model of tire choice, etc (same story with taller 225/45/17). In our opinion 9 inch wheels on this car are just for the customers actually racing the weekends at autocross and track events, driving 9 inch wheels on the street is just asking for curb rash and rough ride for grip levels you cannot really use when not at SCCA and track events. Typical STR autocross setup is 17x9 with 245/40/17, which can be used by SCCA STR competitors with a fender roll.
Please note that most 15 inch wheels for previous Miata generations do NOT clear the big ND brake calipers, even on cars without the Brembo upgrade, and the effective offset to make 15 inch clear the ND brakes will usually put the tire outside the fender lip (and the fender arch on ND is bigger than prior miatas, doesn't look right with 15 inch anyway). Thus, we do NOT suggest 15 inch choices on the ND.
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