JT Sprockets

Online Catalogue

Yamaha TZR250 (1KT) — Japan

1987 to 1988

Front Sprocket

Lightweight Self-Cleaning Front Sprocket

Part Number: JTF565SC

Teeth: 14

Available Sizes: 12, 13, 14

Steel Front Sprocket

Part Number: JTF565

Teeth: 14

Available Sizes: 13, 14, 15, 16, 17, 18

OE Type Rubber Cushioned Front Sprocket

Part Number: JTF565RB

Teeth: 14 Check Availability

Available Sizes: 15, 16

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR846

Teeth: 41

Available Sizes: 37, 39, 40, 41, 43, 45

Drive Chain

Pitch: 520

Length: 110

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
12131415161718
Rear Sprocket373.08
+5.3%
2.85
-2.8%
2.64
-9.8%
2.47
-15.8%
2.31
-21.0%
2.18
-25.7%
2.06
-29.8%
393.25
+11.0%
3.00
+2.4%
2.79
-4.9%
2.60
-11.2%
2.44
-16.8%
2.29
-21.7%
2.17
-26.0%
403.33
+13.8%
3.08
+5.1%
2.86
-2.4%
2.67
-8.9%
2.50
-14.6%
2.35
-19.7%
2.22
-24.1%
413.42
+16.7%
3.15
+7.7%
2.93
standard
2.73
-6.7%
2.56
-12.5%
2.41
-17.6%
2.28
-22.2%
433.58
+22.4%
3.31
+12.9%
3.07
+4.9%
2.87
-2.1%
2.69
-8.2%
2.53
-13.6%
2.39
-18.4%
453.75
+28.0%
3.46
+18.2%
3.21
+9.8%
3.00
+2.4%
2.81
-4.0%
2.65
-9.6%
2.50
-14.6%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)