JT Sprockets

Online Catalogue

Aprilia 125 AFI Replica

1988 to 1992

Front Sprocket

OE Type Rubber Cushioned Front Sprocket

Part Number: JTF402RB

Teeth: 16

Available Sizes: 16

Steel Front Sprocket

Part Number: JTF402

Teeth: 16

Available Sizes: 13, 14, 15, 16, 17

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR19

Teeth: 36

Available Sizes: 36, 37, 38

Drive Chain

Pitch: 520

Length: 104

Please note that the chain shown in this listing is for size reference only. For the correct chain type and grade, please refer to the vehicle's manufacturer manual.

Gear Ratio Chart

TeethFront Sprocket
1314151617
Rear Sprocket362.77
+23.1%
2.57
+14.3%
2.40
+6.7%
2.25
standard
2.12
-5.9%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)