H&R 40255573 TRAK+ Hubcentric Wheel Adapter 5/112 66.5CB 14x1.5 - Pair

The H&R TRAK+ Wheel Adapter (MPN: 40255573) is a precision-engineered, hubcentric wheel adapter designed for Mercedes wheels with a 5/112 bolt pattern, 66.5mm center bore, and 14×1.5 thread pitch. Sold as a pair, these adapters allow wheels with a different bolt pattern or center bore to be fitted to your vehicle, enabling custom wheel combinations that would otherwise not be compatible.

H&R TRAK+ Wheel Adapters mount to the vehicle hub just like a standard wheel spacer, but feature a different bolt pattern on the wheel-facing side — making it possible to run non-OEM bolt pattern wheels while maintaining proper hubcentric alignment. This hubcentric design provides a full-contact hub interface, mirroring the factory hub for even load force distribution and lateral support.

Key Features:

• Hubcentric design — full contact hub for even load distribution and lateral stability
• Changes bolt pattern — allows fitment of wheels from a different vehicle make or model
• Made from a proprietary aluminum/magnesium alloy — lighter and higher tensile strength than standard 6061-T6 billet aluminum
• Hard anodized finish — tough, corrosion-resistant surface for long-term durability
• 100% made in Germany
• Sold as a pair (two adapters)

TRAK+ Adapter Series Overview:

• DR Series (10–40mm) — Fits between wheel and hub; requires longer wheel bolts (ordered separately)
• DRS Series (10–40mm) — Fits between wheel and hub; requires replacement of existing wheel studs with longer ones (studs included)
• DRA Series (40–60mm) — Bolts directly to hub with special wheel bolts (included); provides new threaded holes for wheel bolts
• DRM Series (40–90mm) — Bolts to hub using existing wheel studs and special nuts (included); wheel bolts to new DRM wheel studs

Wheel Bolt Guidelines:

• Replacement bolts must be longer than the originals by the thickness of the adapter used
• Bolt head style must match the original (taper 60°, round head, or flat head)
• Minimum thread engagement requirements by bolt size:
  • M12×1.25 — 8.0 turns (~10mm load-bearing shaft length)
  • M12×1.50 — 6.5 turns (~10mm load-bearing shaft length)
  • M12×1.75 — 6.5 turns (~12mm load-bearing shaft length)
  • M14×1.25 — 9.0 turns (~12mm load-bearing shaft length)
  • M14×1.50 — 7.5 turns (~12mm load-bearing shaft length)
  • 1/2" UNF — 8.0 turns (~11mm load-bearing shaft length)

Installation Note: After installation, rotate the wheel by hand to verify it spins freely and that wheel bolts do not contact any brake components or ABS sensors. Maximum clearance tolerance on some vehicles (such as the Mercedes rear axle) may be as little as 2mm.