When shopping for new Miata wheels there are a couple critical issues to consider:
Weight....Add Lightness! The Mazda Miata is incredibly 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). I was surprised when I bought my first Miata in the early 90s when I ended up not enjoying the very first set of very nice wheels I picked because the ride quality became poor. Most Miata owners can feel a deterioration of ride quality from a gain of as little as 2 to 3 pounds per corner in unsprung weight. We therefore strongly recommend that you use only light weight wheels for your 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 lightness. For that reason, many of our listed weights here are slightly higher than the marketing weight listed on the wheel manufacturers' websites.
Offset and Size. Miata wheel 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 tire bead surface, 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 the 1990-2005 Mazda Miata the factory offsets are 45mm for 14 inch wheels and 40mm for factory 15s, 16s, and 17s. Lowering the offset number from 45 to 40 to 35 is moving the wheel further outboard. Stick to the range of 38-45mm for stock height to avoid concerns with fender lip rub. Those with lowered suspensions and 1.5 negative camber or better can pick a more aggressive offsets like 35-38mm and still clear factory fender lips easily with 195/50/15 or 205/50/15 tires. Offsets lower than 35mm will often require fender lip roll, particularly on the NA generation Miata (1990-1997). Those looking to have the wheels flush with the rolled fender lips will often pick even more aggressive 20mm to 30mm choices. Spec Miata racers are usually using 25mm offsets. We have numerous 15x9 choices for those racing with 225/45/15 and these wheels require changing stock suspension for more narrow coilovers (like our TEIN and Ohlins coilovers), in addition to fender lip rolling. 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.
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. 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.
Shop our Miata 1990-2005 Wheels catalog by clicking below:
We last spoke in November about some upgrades for my 2011 MX5 soft top. It
has finally warmed up in NE Ohio and two relaxed weekends of wrenching on my
car were well worth the effort.
Installation of the RoadsterSport ceramic coated street header was straight
forward and took under 8 hours, including a 40 minute test drive and cleanup
of the garage! Combined with the RoadsterSport Q exhaust, the sound is
fantastic and the increased torque, horsepower and performance make it a
blast to drive.
The addition of the Cobalt shock tower brace, Racing Beat sway bars, ILM
front power train and X braces really enhanced the ride - minimal body roll,
comfortable and very responsive.
Your recommendations really helped transform the car from great to
fantastic. Your research, product development and candid recommendations
make you a standout in the industry.
My only questions are - what's next on my list .... And how soon will my
wife want the same upgrades on her 2012 PRHT ...
Again, thank you!!!
Brian, just wanted tyou to know you've got another highly satisfied customer. I got my RoadstersportIII muffler on Friday, installed it in 20 minutes, looks and sounds awesome. I like the baffles out!! My new tires/wheels came Saturday, just got them on and test drove them. Fantastic!! And how they look--- just what I was after. I will add the front "mud flap" that looks like the rear one, for some stone protection, but the offset was just what I was working for. I'd love to send you some pictures for your photo gallery. If you'll send an adress via e-mail, I'll send some high-res photos showing clearances and side profiles, etc. The graphite spokes and polished rims really set well on my black car.
Thanks again, me and my wallet will be back!!