MPP Mega Terra forged wheels for Rivian R1T and R1S, sold individually. Order four for a complete set or five if you want a matching full-size spare. Mountain Pass Performance designed the wheel in-house and Braid Motorsport manufactures it in Barcelona, Spain.
Wheel specifications
- Size: 20 × 9.5 inches
- Offset: +46
- Weight: approximately 32.5 lb per wheel
- Load rating: 1,200 kg per wheel
- Fitment: Rivian R1T and R1S
- Available finishes: Satin Bronze and Satin Anthracite
Engineering and construction
- Forged motorsport-grade construction
- Designed from Rivian 3D scans to maximize suspension clearance while maintaining a high offset
- Wider 9.5-inch width for improved steering response, wheel-face depth, and tire support
- FEA-optimized with strength prioritized over minimum possible weight
- Back-machined hub face to remove unnecessary material
- Deep bead knurling with unpainted bead surfaces for additional tire grip at reduced pressure
- Unpainted wheel-to-hub and lug-seat mating faces
- Barrel reinforcing ribs with a smooth inner barrel
- Threaded accessory holes for future MPP aero covers and wheel protectors
Manufacturing
Braid Motorsport has decades of motorsport-wheel experience, including competition programs in disciplines such as Dakar and WRC, along with Formula E, E-TCR, and European OEM prototype work.
Efficiency note
MPP reported approximately 2.15 mi/kWh at 75 mph in one test using 275/65R20 BFGoodrich KO3 tires at 60 psi, with no aero covers or bead protectors, a quad-motor Rivian in Conserve mode, HVAC off, approximately 15°C ambient temperature, cloudy conditions, and light wind. This is a single test result rather than a guaranteed range figure; actual efficiency varies with tires, pressure, speed, weather, load, alignment, vehicle configuration, and driving conditions.
Custom 21-inch option
A custom 21-inch version has also been developed. Contact ZEVcentric for current availability, finish choices, pricing, and lead time.
Confirm tire size, load rating, brake clearance, suspension clearance, and intended use before ordering.