JT Sprockets

Online Catalogue

Ducati 821 Monster Dark

2014 to 2018

Front Sprocket

Steel Front Sprocket

Part Number: JTF742

Teeth: 15

Available Sizes: 14, 15

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR746

Teeth: 46

Available Sizes: 39, 43, 44, 46, 48

Drive Chain

Pitch: 520

Length: 108

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
1415
Rear Sprocket392.79
-9.2%
2.60
-15.2%
433.07
+0.2%
2.87
-6.5%
443.14
+2.5%
2.93
-4.3%
463.29
+7.1%
3.07
standard
483.43
+11.8%
3.20
+4.3%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)