JT Sprockets

Online Catalogue

Kawasaki BJ Estrella 250

1998 to 2000

Front Sprocket

Steel Front Sprocket

Part Number: JTF512

Teeth: 15

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

OE Type Rubber Cushioned Front Sprocket

Part Number: JTF512RB

Teeth: 15

Available Sizes: 15, 16, 17

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR487

Teeth: 38

Available Sizes: 37, 38, 42, 43, 44, 45, 46, 47

Drive Chain

Pitch: 520

Length: 102

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 Sprocket372.85
+12.3%
2.64
+4.3%
2.47
-2.6%
2.31
-8.7%
2.18
-14.1%
382.92
+15.4%
2.71
+7.1%
2.53
standard
2.38
-6.2%
2.24
-11.8%
423.23
+27.5%
3.00
+18.4%
2.80
+10.5%
2.62
+3.6%
2.47
-2.5%
433.31
+30.6%
3.07
+21.2%
2.87
+13.2%
2.69
+6.1%
2.53
-0.2%
443.38
+33.6%
3.14
+24.1%
2.93
+15.8%
2.75
+8.6%
2.59
+2.2%
453.46
+36.6%
3.21
+26.9%
3.00
+18.4%
2.81
+11.0%
2.65
+4.5%
463.54
+39.7%
3.29
+29.7%
3.07
+21.1%
2.88
+13.5%
2.71
+6.8%
473.62
+42.7%
3.36
+32.5%
3.13
+23.7%
2.94
+16.0%
2.76
+9.1%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)