Description
The Original half tooth Precision 0.5 sprocket range made in the UK (65.5T to 85.5T) is built for drivers who demand absolute control. With 0.5-tooth steps, you can fine-tune gear ratios without touching the front sprocket—perfect for extracting that last tenth or dialing in consistency on any layout.
This lineup helps teams adapt gearing with surgical precision, avoiding compromise when engine response or track configuration demands subtle tweaks. Ideal for serious racers chasing margins that matter.
TECHNICAL DETAILS
Material: CNC-machined 7075-T6 aluminium for high strength and low weight
Gear Adjustment: Each 0.5 step changes ratio by ~0.7–0.8%
Compatibility: Fully compatible with all 219 pitch chains
No Front/Chain Changes: Requires no adjustment to chain length or front sprocket
Precision Engineering: Pitch circle diameter (PCD) is altered, not tooth count
BENEFITS
Fine Ratio Adjustments: Adjust ~0.7% at a time to stay in optimal RPM
Track-Proven Results: Up to 0.25s gain per lap in competitive testing
No Front Swap: Ideal when front sprockets are locked or limited
Durability: Reliable across full race distances under stress
Class Versatility: Works for open or regulated rear-gear formats