JT Sprockets

Online Catalogue

Gas Gas 250 EC F 4T

2013 to 2015

Front Sprocket

Lightweight Self-Cleaning Front Sprocket

Part Number: JTF1590SC

Teeth: 13

Available Sizes: 13, 14

Steel Front Sprocket

Part Number: JTF1590

Teeth: 13

Available Sizes: 12, 13, 14

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR822

Teeth: 48

Available Sizes: 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53

Aluminium Rear Race Sprocket

Part Number: JTA822

Teeth: 48

Available Sizes: 44, 45, 48, 49, 50, 51, 52, 53

Drive Chain

Pitch: 520

Length: 114

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
121314
Rear Sprocket413.42
-7.5%
3.15
-14.6%
2.93
-20.7%
423.50
-5.2%
3.23
-12.5%
3.00
-18.8%
433.58
-3.0%
3.31
-10.4%
3.07
-16.8%
443.67
-0.7%
3.38
-8.3%
3.14
-14.9%
453.75
+1.6%
3.46
-6.2%
3.21
-12.9%
463.83
+3.8%
3.54
-4.2%
3.29
-11.0%
473.92
+6.1%
3.62
-2.1%
3.36
-9.1%
484.00
+8.3%
3.69
standard
3.43
-7.1%
494.08
+10.6%
3.77
+2.1%
3.50
-5.2%
504.17
+12.8%
3.85
+4.2%
3.57
-3.3%
514.25
+15.1%
3.92
+6.2%
3.64
-1.3%
524.33
+17.4%
4.00
+8.3%
3.71
+0.6%
534.42
+19.6%
4.08
+10.4%
3.79
+2.5%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)