H&R 502345714 TRAK+ Wheel Adapters Hubcentric Audi 4/108 57.1CB (Pair)

The H&R TRAK+ Wheel Adapters (Part # 502345714) allow you to fit wheels with a different bolt pattern to your Audi, adapting from a 4/108 bolt pattern with a 57.1mm center bore. Sold as a pair, these hubcentric adapters are engineered to the same exacting standards as the full H&R TRAK+ spacer lineup, delivering both a precise fit and a wider track for improved stance and handling.

Unlike a simple slip-on spacer, TRAK+ Wheel Adapters bolt directly to the vehicle hub and present a different bolt pattern on the wheel-facing side, enabling non-standard wheel fitment without compromising safety or hub centering. The hubcentric design ensures the adapter seats flush against the factory hub, eliminating vibration and maintaining proper load transfer.

Key Features:

• Hubcentric design — seats precisely on the factory hub center for vibration-free fitment
• Bolt pattern conversion — adapts Audi 4/108 (57.1mm CB) to accept wheels with a different bolt pattern
• Sold as a pair — includes two adapters
• Proprietary aluminum/magnesium alloy construction — up to 70% lighter than a comparable steel product
• Hard anodized finish — provides a tough, corrosion-resistant surface
• Maximizes track width — lowers roll center and increases lateral stability for improved handling
• Available in 20mm–25mm thicknesses
• Suitable for use with winter tire and wheel setups

Wheel Bolt Selection Guidelines:

When using TRAK+ Wheel Adapters, replacement wheel bolts must be longer than the original bolts by at least the thickness of the adapter. The bolt head style must match your existing hardware exactly. Common bolt head types include:

• Taper 60° — end digit 01
• Round head M12/d24mm or M14/d28mm — end digit 02
• Round head M12/d26mm (e.g., OE VAG wheels) — end digit 03
• Flat head for Porsche OE wheels M14×1.5 — end digit 06

Minimum Wheel Bolt Engagement (Safety Guidelines):

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

After installation, rotate the wheel by hand to verify full clearance on the inside of the hub. Ensure wheel bolts do not contact ABS sensors or any brake system components. Note that maximum tolerance on some vehicles (e.g., rear axle on certain Mercedes models) may be as little as 2mm.