JT Sprockets

Online Catalogue

KTM 790 Duke

2018 to 2019

Front Sprocket

Steel Front Sprocket

Part Number: JTF1902

Teeth: 16

Available Sizes: 12, 13, 14, 15, 16, 17

OE Type Rubber Cushioned Front Sprocket

Part Number: JTF1902RB

Teeth: 16

Available Sizes: 15, 16, 17

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR897

Teeth: 41

Available Sizes: 38, 40, 41, 42, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53

Aluminium Rear Race Sprocket

Part Number: JTA897

Teeth: 41 Check Availability

Available Sizes: 38, 40, 42, 45, 47, 48, 49, 50, 51, 52

Drive Chain

Pitch: 520

Length: 118

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
121314151617
Rear Sprocket383.17
+23.6%
2.92
+14.1%
2.71
+5.9%
2.53
-1.1%
2.38
-7.3%
2.24
-12.8%
403.33
+30.1%
3.08
+20.1%
2.86
+11.5%
2.67
+4.1%
2.50
-2.4%
2.35
-8.2%
413.42
+33.3%
3.15
+23.1%
2.93
+14.3%
2.73
+6.7%
2.56
standard
2.41
-5.9%
423.50
+36.6%
3.23
+26.1%
3.00
+17.1%
2.80
+9.3%
2.62
+2.4%
2.47
-3.6%
443.67
+43.1%
3.38
+32.1%
3.14
+22.6%
2.93
+14.5%
2.75
+7.3%
2.59
+1.0%
453.75
+46.3%
3.46
+35.1%
3.21
+25.4%
3.00
+17.1%
2.81
+9.8%
2.65
+3.3%
463.83
+49.6%
3.54
+38.1%
3.29
+28.2%
3.07
+19.7%
2.88
+12.2%
2.71
+5.6%
473.92
+52.8%
3.62
+41.1%
3.36
+31.0%
3.13
+22.3%
2.94
+14.6%
2.76
+7.9%
484.00
+56.1%
3.69
+44.1%
3.43
+33.8%
3.20
+24.9%
3.00
+17.1%
2.82
+10.2%
494.08
+59.3%
3.77
+47.1%
3.50
+36.6%
3.27
+27.5%
3.06
+19.5%
2.88
+12.5%
504.17
+62.6%
3.85
+50.1%
3.57
+39.4%
3.33
+30.1%
3.12
+22.0%
2.94
+14.8%
514.25
+65.9%
3.92
+53.1%
3.64
+42.2%
3.40
+32.7%
3.19
+24.4%
3.00
+17.1%
524.33
+69.1%
4.00
+56.1%
3.71
+44.9%
3.47
+35.3%
3.25
+26.8%
3.06
+19.4%
534.42
+72.4%
4.08
+59.1%
3.79
+47.7%
3.53
+37.9%
3.31
+29.3%
3.12
+21.7%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)