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Motorbike parts and tools

Transmissions

Sprocket JT. Steel Standard 239 - 420

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JT. Steel Standard 239 - 420 SprocketRef : JTC00990A / 1074997006

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Description
Compatible motorbikes
Questions and answers

DescriptionJT. Steel Standard 239 - 420 Sprocket

Product details :

Features

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

Technical information :

Reference

JTC00990A / 1074997006

No transmission chain

420

Number of teeth (crown)

Type of crown

Standard

Number of teeth

45 teeth

Material

Steel

Compatible motorbikes

HONDA5 compatible models

MBX 50 SD (AC05) - 1985/1987MT 50 S (AD01) - 1980/1981MTX 80 (HD06) - 1982/1982MBX 80 FWD (HC04) - 1983/1985CR 80 R STD WHEELS 14/17 (HE02) - 1980/1980