Billet Crank Sprockets from Boundary follow the same heritage as our oil pump gears, manufactured 100% in house with US sourced materials. These sprockets start with a chromoly steel that is 10 times stronger then the OEM powdered metal, hot quenched with a low temper for the highest strength and resistance to wear.
- All sprockets heat treated to maximum hardness while maintaining toughness
- Precision CNC machined and broached for snug accurate fit
- Dimensions checked after machining and after heat treating for guaranteed fit.
- 80% more cross section versus OEM at the keyway
- Weighs 30% more then OEM
- High finish reduces friction and chain vibration
- New tooth geometry strengthens teeth and keyway
Includes 2 sprockets, one for each chain
![DIAMOND Racing Pro-Select Ring Set [Bore Size 3.898 | Top Ring Axial 1.2mm | Top Ring Radial 0.134 | Top Ring Type AP | 2nd Ring Axial 1.5mm | 2nd Ring Radial 0.163 | 2nd Ring Type RBT | Oil Ring Axial 3.0mm | Oil Ring Radial 0.145 | Oil Ring Tension STD] (2009-2024 Nissan GT-R)](images/no_picture.gif "DIAMOND Racing Pro-Select Ring Set [Bore Size 3.898 | Top Ring Axial 1.2mm | Top Ring Radial 0.134 | Top Ring Type AP | 2nd Ring Axial 1.5mm | 2nd Ring Radial 0.163 | 2nd Ring Type RBT | Oil Ring Axial 3.0mm | Oil Ring Radial 0.145 | Oil Ring Tension STD] (2009-2024 Nissan GT-R)")
