When shopping for new RX8 wheels there are a couple critical issues to
Weight. The Mazda RX8's fine handling and ride quality is very
sensitive to what is called "unsprung" weight (which can best be understood
as what hangs off the RX8 suspension rather than what sits on it). More
than most automakers, Mazda tunes and equips its sports cars with very light
wheels and owners should be very careful about keeping the weight down when
they select replacement RX8 rims. Most RX8 owners can feel a deterioration
of ride quality from a gain of as little as 3 pounds per corner in unsprung
weight. We therefore strongly recommend that you use only light weight
wheels for your RX8 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. RX8 wheel offset causes a lot of confusion. Here is
a simple explanation. If the rim is 8 inches wide, and the mounting surface
of that rim (backside of the bolt holes), is 4 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. The Mazda RX8 factory 18x8 inch wheel has an offset of 50mm.
A 40mm offset choice is moving the track wider by 10mm per side. RX8 owners
looking to stick to stock width can consider any of the offsets we offer
here, but RX8 owners looking to go with substantially wider tires should
stick to our 45 to 48 mm choices. For those looking to mount maximum tire
width for autocross or track events see our 45mm 18x9.5 RP-F1 alloys which
are lighter than stock wheels but allow 265/35, 275/35 and even 285/30/18s
to be mounted on all four corners of an RX8.
Shop our RX8 2004-2011 Wheels catalog by clicking below:
I absolutely love my Roadster Sport headers, mid pipe and Q muffler. I have owned a lot of cars over the years and the quality of your product is truly exceptional. The ability to tune the Super Q is very much appreciated.
-- Tony G.
Roadstersport II was a great purchase, easy install, and sounds great.