Rear sprocket JT JTR1219.42 42T 428

JT Sprockets rear chain sprocket JTR1219.42 made of steel gearing — a British manufacturer with a tradition dating back to 1946. JT rear sprockets are CNC machined with precise tooth geometry for smooth engagement with DID, RK, JT and other chains. Changing the number of teeth on the rear sprocket affects the bike's character: more teeth = higher torque (better acceleration, lower top speed), fewer teeth = higher top speed (suitable for track and road use). Delivery time 7–14 days. SKU: JTR1219.42.