Enkei 37981056515GM RPF1 Lightweight Racing Series Wheel 18x10.5 5x114.3 15mm Gunmetal

The Enkei RPF1 is one of the most celebrated lightweight performance wheels in the aftermarket industry, engineered from the ground up using technology derived directly from Formula One racing. This listing is for the 18x10.5" Gunmetal variant (MPN: 37981056515GM), featuring a 5x114.3 bolt pattern, 15mm offset, and 73mm center bore.

MAT Process Construction:

Each RPF1 is manufactured using Enkei's proprietary M.A.T. (Most Advanced Technology) process, which combines one-piece cast wheel technology with a rotary rim-spinning technique. This process reduces overall wheel weight by 10–15% compared to conventional casting methods. Every pound saved in unsprung weight translates to an equivalent reduction of up to 20 lbs in effective vehicle weight, delivering measurable improvements in acceleration, braking, and handling response.

F1-Inspired Design:

Enkei serves as an official wheel supplier to the McLaren Mercedes Formula One Team, and the RPF1 was developed using the same engineering principles as their F1 race wheels. The signature twin open-stance spoke design is drawn directly from the McLaren F1 race wheel, optimized to distribute stress more effectively during hard cornering, heavy braking, and high-intensity race driving.

Key Features:

• Size: 18x10.5"
• Bolt Pattern: 5x114.3
• Offset: +15mm
• Center Bore: 73mm
• Finish: Gunmetal
• Construction: MAT Process Aluminum Alloy (rotary forged)
• Center Pocket Design: Reinforced bolt circle area increases rigidity and aids brake cooling during aggressive driving
• Valve Stems Included: Anodized black aluminum stem with black aluminum cap
• Center Cap: Not included
• Alternate Part Number: 379-8105-6515GM
• Tested to JGTC Standards
• Lifetime structural warranty

The RPF1's enduring popularity among track-day enthusiasts, autocross competitors, and street performance drivers is a testament to its uncompromising balance of light weight, structural rigidity, and iconic twin-spoke aesthetics. Available in Silver, Gold, Black, and Gunmetal finishes across a range of sizes.