JT steel rear sprocket JTR1780.28, 28 teeth, 420 pitch

JT steel rear sprocket JTR1780.28, 28 teeth, 420 pitch

JT rear sprocket. The vehicle compatibility list below has been taken from the official JT Sprockets Application Guide 2024.

Technical data

• JT part number / fitment: JTR1780
• Installation position: Rear
• Chain pitch: 420
• Teeth available in shop: 28

Suitable for – official JT vehicle compatibility

Important note on tooth selection: The JT fitment number describes the compatible mount. The application guide also indicates the number of teeth with which each vehicle is listed. Other offered tooth counts within the same fitment family will change the gear ratio and may differ from the standard factory gearing.

28 teeth according to JT Application Guide

• Kawasaki KDX50 A1-A3,A6F (50 cc) – Year 03-06 – Chain 420, 78 links
• Suzuki JR50 C,N,T,X,Z USA (50 cc) – Year 78-82 – Chain 420, 78 links
• Suzuki JR50 RD USA (50 cc) – Year 83 – Chain 420, 78 links
• Suzuki JR50 F,G,H,J,K,L,M,N,P,R,S,T,V,W,X,Y,K1,K2,K3,K4,K5,K6 (50 cc) – Year 85-06 – Chain 420, 78 links

Installation and gearing note

• Check model, year, chain pitch, and desired tooth count before ordering.
• A different number of teeth changes the gear ratio and may require a different chain length or adjustment of the chain tension.
• Perform installation and tightening according to the vehicle manufacturer's specifications.