JT Steel Rear Sprocket JTR19.37, 37 teeth, 520 pitch

JT steel rear sprocket JTR19.37, 37 teeth, 520 pitch

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

Technical specifications

• JT part number / Fitment: JTR19
• Installation position: Rear
• Chain pitch: 520
• Teeth selectable in shop: 37

Compatible with – official JT vehicle list

Important regarding tooth selection: The JT fitment number describes the compatible mounting. The application guide also indicates the number of teeth with which the respective vehicle is listed. A different number of teeth offered within the same fitment family changes the gear ratio and may differ from the stock gear ratio.

36 teeth according to JT Application Guide

• Aprilia 125 AFI Replica – Model year 88-92 – Chain 520, 104 links

37 teeth according to JT Application Guide

• Aprilia 125 AFI Sintesi – Model year 88-89 – Chain 520, 106 links
• Aprilia 125 AFI Sport – Model year 93 – Chain 520, 106 links
• Aprilia 125 AFI Super Sport – Model year 88-90 – Chain 520, 106 links

38 teeth according to JT Application Guide

• Aprilia 125 AFI Sport Pro – Model year 92-93 – Chain 520, 108 links
• Aprilia 125 AFI Futura / Europa – Model year 90-93 – Chain 520, 106 links

Installation and gear ratio note

• Before ordering, check the model, year of manufacture, chain pitch, and desired number of teeth.
• A different number of teeth changes the gear ratio and may require a different chain length or an adjustment of the chain tension.
• Carry out installation and tightening torques according to the vehicle manufacturer's specifications.