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
