BONOSS Forged 6061-T6 Hubcentric Wheel Spacers 15mm — 5x112 BMW

The hardware included is equally serious. Studs are forged from SCM440 steel and rated Grade 12.9 — a step above what BMW installs from the factory — while the T8 heat-treated lug nuts are built to hold torque consistently over years of use. BONOSS puts this hardware through a one-million-cycle anti-fatigue test and a 72-hour continuous salt spray test before it earns SGS and TUV certification. This is not marketing paperwork — it reflects genuine validation testing that most budget spacer brands skip entirely.

Fitment covers an extensive range of modern BMW platforms running the 5x112 bolt pattern, including the G20 3 Series, G80 M3, G22 4 Series, G82 M4, G30 5 Series, F90 M5, G70 7 Series, X3, X5, X6, X7, i4, iX, and many more F and G chassis variants. The 15mm offset pushes each wheel outward just enough to fill the arches aggressively without requiring arch rolling or liner trimming on most stock setups. Thread pitch is M14x1.25, and the kit arrives as a complete two-piece set ready to install with no additional hardware needed.

Beyond aesthetics, widening your track by 30mm total has measurable real-world effects — improved lateral stability, sharper initial turn-in response, and a more planted feel through fast corners. Paired with BONOSS's 10-year warranty, this is one of the highest-value modifications available for any compatible BMW, whether the goal is a cleaner street stance or a more capable track setup.