Darkhorse Crowned Pinion Races for Harley Davidson Big Twin
Unlike traditional flat OEM races, this hardened steel race features a proprietary micro-radius crowned profile. It is designed to accommodate natural crankshaft/flywheel flex under heavy acceleration and high torque, preventing destructive edge-loading on the pinion bearings and centering forces at the engine's lower end.
Features
- Accommodates inherent crankshaft movement under heavy acceleration and high torque, preventing severe stress concentration
- Micro-radius profile centers the forces acting on the engine's lower end to maintain rigid structural alignment
- Eliminates destructive bearing edge-loading to drastically extend engine service life
- Bearing Compatibility: Engineered to pair precisely with high performance main bearings, specifically optimized around the industry-standard #24605-07 Harley Davidson main bearing specification.
- Sizing (Standard vs. Oversized): The DH-PR-A (0921-1004) is the Standard-diameter drop-in replacement.
- if engine cases or flywheel pinion shaft has been machined or requires an oversized bore configuration to fix a loose fit, select Oversized version DH-PR-B (0921-1005).
Specs
Product Name Pinion Race
Type Crowned / Oversized
Color/Finish Silver
Material Hardened Steel
Units Each
Riding Style Street
Images coming soon
