Good-Win Racing is the only wheel dealer actually owning, daily driving, and weekend racing an NC Miata. We also stock THOUSANDS of wheels and have developed fitments that are exclusive to us. Thus, nobody is better equipped to get you setup with the right fitment.
Our favorite Miata street tire currently is the Continental ECS (ExtremeContactSport), for it's excellent mix of good grip, ride, and low noise, and good in dry or wet. Despite racing weekends on 17x9 and 17x10 with the popular 200 treadwear tires (Rival, RE71R, A052), we take them OFF THE CAR at the end of the race weekend and seal them in big garbage bags in the garage to keep them fresh and fast for next event. Yes, that means those racing have 2 sets of wheels at least, one set for daily and one set for autocross and track weekends. Clean wheels reguarly, coat with Gtechniq - C5 Wheel Armour once a year.
When shopping for new MX5 Miata wheels and tires there are additional critical issues to consider. Click tabs below for more on the most common topics for NC Wheels. If potential rub of the plastic fender liner, particularly at full steering lock, is going to concern you, then your max size is a 45-50mm offset 17x8 with 215/45/17. Note that for pure street customers seeking to use 225/45/17 or 235/40/17 tire we suggest coilovers so you can set heights as needed (and you may need some fender lip roll for 235/40 or wider). Yes, you should do suspension mods BEFORE you add the bigger wheel and tire package because bigger wheels and tires need additional roll resistance, and lowering springs and coilovers provide access to more negative camber that tips the top of the tires inward for easier fit. The 17x9 and wider wheels are for Track and Autocross customers, we don't recommend 17x9 for just street driving because of higher levels of noise and tramline behavior on the freeway, etc. Customers looking at 17x9 and bigger/wider should be adding one of our coilover choices first with performance alignment and we suggest starting heights of 13.25 front, 13.5 rear (inches measured center of wheel up to fender lip). 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.
Offset and Size
Offset causes a lot of confusion. Here is a simple explanation. If the rim is 6 inches wide, and the mounting surface of that rim (backside of the bolt holes), is 3 inches from either outside edge, that rim has a 0 offset. To the extent that a rim's mounting plane is offset from that zero position, that offset is measured in millimeters for Japanese cars. For the 2006-2015 Mazda MX5 Miata the factory offset is 55mm for the 17 inch size. Street users considering a wider stance but staying with stock width tires may consider offsets down to about 40mm without rolling fender lips or worrying about extra aggressive camber settings. For Miata owners looking to go wider than the factory 205/45/17 MX Miata tire size, we suggest our many 48mm offset choices in widths of 7.5 and 8 inches as the most easy fitments. However, as you push out with offset and lower the car you can still clear stock fender lips if you use conservative size tires and/or more aggressive camber numbers. Thus, 40mm offset Konig Ampliform 17x8 wheels can fit stock fenders with a 215/45/17 tire if you max the camber setting (and the MORE YOU LOWER the car the more negative camber you can get and it becomes possible to fit even 225/45/17 at 40mm offset if lowered enough). Our 45mm 18x9.5 Enkei RP-F1 is intended as a race application only. Please
contact us if you have any questions on appropriate offset for your intended use.
Mounting Tires
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
Folks ask every day what is the MAX size they can install on the 2006-2015 MX5 Miata without rolling fenders? The max tire size that fits in stock MX5 Miata fenders is 235/40/17. Note that offset is critical, 48mm to 50mm choices get that 235/40/17 under stock fender lips with mild camber. Wheel choices that are 45mm offset usually need some fender lip roll, or a lot more negative camber for 235/40. Thus, our popular autocross 17x9 Enkei RPF1 with 45mm offset often requires a fender lip roll for 235/40/17 or more tire (STR customers often using 255mm wide tires but that requires lips rolled up flat inside). A 45mm offset wheel with just 225/45/17 tire and camber of -1.2 or more usually clears stock fenders, but not at 40mm offset. At 45mm offset if you run better than -2.0 camber all around then 235/40 will usually clear stock fenders. Variables include height of the car, brand of the tire (race tires typically over the listed size). As odd as it sounds, lower car has easier clearance for more aggressive offsets because you have access to much more negative camber that tips tops of tires inward and lowered enough the suspension arms start to swing inwards too. The limit without fender flares is typically 255mm, we have run as much as 285mm and 295mm tires using our fender flares which are available on this site.
Lug Torque
Torque lugs to 85 ft/lbs and check that torque again every week for first month of owning new wheels or lugs.
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.
Lug Torque
Torque lugs to 85 ft/lbs and check that torque again every week for first month of owning new wheels or lugs.
Wheel Care
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.
