H&R 40675671 TRAK+ Wheel Adapters BMW 5/120 to 5/120 72.5mm Hub Pair

The H&R TRAK+ Wheel Adapters (Part #40675671) are hubcentric wheel adapters designed for BMW applications with a 5/120 bolt pattern and 72.5mm center bore. Sold as a pair, these adapters allow fitment of wheels with a different bolt pattern while simultaneously widening the vehicle's track for improved stance and handling dynamics.

H&R TRAK+ Adapters are engineered to bolt to the vehicle hub just as a standard wheel spacer would, but feature a different bolt pattern on the wheel-facing side — enabling non-standard bolt pattern wheel fitment without sacrificing hubcentric precision. Thickness ranges from 20mm to 25mm.

Key Features:

• Hubcentric design — seats precisely on the vehicle hub for vibration-free fitment
• Maximizes track width — improves lateral stability, lowers roll center, and enhances handling
• Proprietary aluminum/magnesium alloy construction — up to 70% lighter than comparable steel spacers
• Hard anodized finish — tough, durable, and corrosion-resistant
• Bolt pattern adaptation — allows wheels from a different vehicle make or model to be fitted
• Sold as a pair — includes two adapters
• Compatible with winter wheel and snow tire setups

Wheel Bolt Selection Guidelines:

When ordering replacement wheel bolts for use with these adapters, follow these guidelines:

• New bolts must be longer than the originals by at least the thickness of the adapter used
• The bolt head style must match the original: Taper 60° (end digit 01), Round head M12/d24mm or M14/d28mm (end digit 02), Round head M12/d26mm such as OE VAG wheels (end digit 03), or Flat head for Porsche OE M14×1.5 wheels (end digit 06)

Minimum Wheel Bolt Engagement (Safety Guidelines):

• M12×1.25 — minimum 8.0 turns (~10mm load-bearing shaft length)
• M12×1.50 — minimum 6.5 turns (~10mm load-bearing shaft length)
• M12×1.75 — minimum 6.5 turns (~12mm load-bearing shaft length)
• M14×1.25 — minimum 9.0 turns (~12mm load-bearing shaft length)
• M14×1.50 — minimum 7.5 turns (~12mm load-bearing shaft length)
• 1/2" UNF — minimum 8.0 turns (~11mm load-bearing shaft length)

Important Installation Note: After installation, rotate the wheel by hand to confirm it spins freely and that wheel bolts do not contact any brake system components, including ABS sensors. Note that maximum clearance tolerance on some vehicles can be as little as 2mm (e.g., Mercedes rear axle).