JT SPROCKETS standard sprocket, reference JTR239.45, designed to replace the original part or modify the gearing on 420 chain transmissions. Made from C49 carbon steel, it meets the common needs of urban riders and off-road practitioners looking for a robust and easy-to-install sprocket.

• Brand: JT SPROCKETS
• Type: Standard (sprocket 239)
• Material: C49 carbon steel
• Number of teeth: 45
• Chain pitch: 420
• Manufacturer reference: JTR239.45

Ideal for urban and light off-road use, this sprocket fits transmissions equipped with a 420 chain. It allows for gearing adjustments while maintaining standard mounting geometry. Before installation, check the alignment and condition of the chain and sprockets to ensure smooth operation and prevent premature wear.

Examples of compatibility (not exhaustive):

• HONDA MBX 50 SD (AC05) — 1987
• HONDA MBX 80 FWD (HC04) — 1985
• HONDA MTX 80 (HD06) — 1982