Billet Crank Sprockets from Boundary follow the same heritage as our their 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 at 170 grams vs 130 grams giving the highest strength sprocket on the market.

• High finish reduces friction and chain vibration

• New tooth geometry strengthens teeth and keyway