Rear sprocket JT JTR300.42 42T 525

JT Sprockets rear chain sprocket JTR300.42 made of steel gearing — a British manufacturer with tradition since 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 riding). Delivery time 7–14 days. SKU: JTR300.42.