
JT Sprockets Steel Sprocket 1221 - 428, 45 Teeth (Manufacturer Part No: JTR1221.45)
Designed for the road, the JT Sprockets JTR1221.45 is a wear part intended for replacement or gearing adjustment. Machined from C49 carbon steel, this sprocket has a pitch of 428 and a standard profile with 45 teeth, suitable for corresponding chains and sprockets for easy installation on the final drives of lightweight roadsters.
Ideal for routine maintenance or for adjusting the gearing (changing the number of teeth affects engine behavior and perceived torque), this sprocket is particularly aimed at the small displacements mentioned in compatibility. Before installation, check the condition of the sprocket, chain, and alignment; proper tension adjustment preserves the lifespan of the entire transmission. Compatible with many 125 cc roadsters (e.g., Honda CB 125 F JC74/JC64, CBR 125 RT JC50).