Good-Win Racing is the only wheel dealer actually owning, daily driving, and weekend racing ND Miatas. We also stock THOUSANDS of wheels and have developed fitments that are exclusive to us. Thus, nobody is better prepared to get you setup with the right setup.
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. If potential rub of the plastic fender liner at full steering lock is going to concern you, then your max size is a 45mm offset 17x8 with 215/45/17. Nonetheless, we prefer 235/40 on 17x8 for street max grip since potential rub is just at full steering lock and just on plastic fender liner and we don't care about that since full steering lock is for slow parking lot turns. Despite racing weekends on 17x9 we don't daily drive wheels that wide for obvious reasons of ride quality and increased tramline behavior, etc. If you go 17x9 for weekend racing, YOU must check clearances to items like fender lip on the outside and brake lines to the inside, rubbing plastic fender liners with any tires of 225/45 or wider is considered normal. For track use and tire sizes of 225/45 or 235/40 we suggest our coilovers with starting heights of 13.25 front, 13.5 rear (measured center of wheel up to fender lip). Konig and Advanti wheels include center caps, but not valve stems or lugs or hubcentric rings. Most our Enkei wheels include center caps AND valve stems unless otherwise noted. We consistently recommend folks do suspension mods BEFORE the bigger wheel and tire package because bigger wheels and tires need additional roll resistance, and lowering springs and/or coilovers provide access to more negative camber that tips the top of the tires inward under the fender lips for easier fit.
See tabs below for more answers to the most common questions. All our Konig and Advanti wheels include center caps, but not valve stems or lugs or hubcentric rings. Most our Enkei wheels include center caps AND valve stems unless otherwise noted.
WEIGHT: ADD LIGHTNESS!
The Mazda MX5 Miata is very sensitive to what is called unsprung weight (which can best be understood as what hangs off the Miata suspension rather than what sits on it). We therefore strongly recommend that you use only light weight wheels for your MX5 Miata like those we sell here. Unlike other vendors who rely on overly optimistic wheel weights as listed by the wheel manufacturers, we weigh each wheel that we sell to verify the weight that we list! For that reason, some of our listed weights here are slightly higher than the marketing weight listed on the wheel manufacturers' websites.
Note the Miata is VERY sensitive to wheel balance issues and many shops do not have equipment that can balance the combination precise enough. Therefore, we suggest finding a shop near you with a Hunter Road Force Balancer (Just google Hunter GSP9700 and enter your zip code in their locator). Torque lugs to 85 ft/lbs and check that torque again every week for first month of owning new wheels or lugs. We ended tire service, the Miata is just uniquely too sensitive to wheel balance issues and we came to realize Customers are best served by getting tires local with a lifetime mount and balance deal that most shops either include or have as an option these days. We can send perfectly balanced sets, 'road force balanced' which is what the Miata needs, but over time with wear you need another re-balance often with the Miata and sometimes just a little rock bouncing up from the road knocks off the balance weight and you need that re-balance yet again to avoid the dreaded Miata 'shimmy' at 60mph. If the Miata was not a convertible it would be a lot stiffer, a lot less prone to this issue, but we all love it because it's a convertible so consider getting tires local and re-balanced as needed yearly as worth it for the fun factor. Note our site will let you ship wheels direct to your top local tire dealer if you like.
Max size that will fit in stock fenders without a fender roll is 235/40/17 using our 17x8 or 17x9, as long as you have about 1.5 degrees of negative camber or more and a 45mm offset wheel. 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.
DO YOU NEED HUBCENTRIC RINGS?
Hubcentric rings ensure that the wheel is centered on the hub, even before the lug nuts are tightened down. It's a nice bit of low-cost piece of mind knowing that you can't end up with a wheel off-center due to incorrect lug nut tightening. However, hubcentric rings are NOT mandatory. The lug nuts seats are conical for a reason; as long as you tighten the lugs correctly (done by hand and in a criss-cross pattern) then the wheels self-center as the lugs are tightened. However, some shops don't take the time to correctly tighten lugs, they just zap them on with an impact gun and the Miata is too sensitive to imbalances for that to be good enough. So, you don't have to use them, but they won't hurt and they're cheap insurance. As a rule of thumb, the racers know they don't want hubcentric rings because they know what they're doing and the rings just become an extra thing to worry about... but if you're asking if you should get hubcentric rings, then the answer is probably "yes" for you. Note that all our hubcentric rings are sold as sets of four, so order just quantity one for a set of wheels.
Most modern wheels are clear coated just like the paint on your car. Therefore, do NOT use anything on your wheels that you would not use on your Miata's paint. Only clear coat safe products should be used on wheels. We like to put a coat of fresh car wax on new wheels before we put them on our Miatas here, helps keep them clean.
BRAKE DUST: Brake dust can be corrosive. Some brands and compounds in particular are known for eating up the finish on wheels, especially if the dust gets sprayed on the wheels when hot at the track and then left there for 24 hours or more, particularly with some overnight dew/moisture or lots of UV gets added to the mix. Some brands' compounds are less corrosive than others, but as a rule of thumb it is always best to keep your wheels clean. Nothing more than normal soap and water is needed. Before leaving the track, we'll seek out a garden hose in the pits to fully rinse the dust off before the drive home.
In the USA, the 2016-2017 ND Miata uses NO in-wheel sensors for tire pressure.
2018+ ND Miatas do use physical tire pressure sensors. We are told the new in wheel sensors do not fit Advanti Storm, customers will want to pick an aftermarket sensor for that wheel for 2018 and newer.
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.
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.
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.
Torque lugs to 85 ft/lbs and check that torque again every week for first month of owning new wheels or lugs.