What are the factory wheel and tire sizes for the E34 M5?
There are two factory 17-inch wheels for the E34 M5: M System I and M System II. Both are a two-piece wheel with a forged five-spoke center and a cast rim covered by an outer cover. The only difference is the design of the outer cover: “turbine” for the M System I and “throwing star” for the M System II. This outer cover is interchangeable between the two M System wheels, making updating form the earlier style to the later style an easy (and therefore common) procedure. All 3.6-liter M5s (with the exception of North American-spec 1993 models) are equipped with 8×17-inch M System I wheels carrying 235/45ZR17 tires. In some markets outside of North America, the rears could be upgraded to a wider 9×17-inch version with 255/40ZR17 tires as an extra-cost option. All 3.8-liter M5s built before May of 1994 (as well as North American-spec 3.6-liter M5s produced for the 1993 model year) are equipped with the later M System II design. Wheel size remained 8×17-inch all around or, as an extra-cost
