JT Sprockets 39 Tooth Rear Steel Sprocket 39T for Yamaha YFZ450 YFZ450R YFZ450X
JT Sprockets 39 Tooth Rear Steel Sprocket 39T for Yamaha YFZ450 YFZ450R YFZ450X
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39 Tooth Rear Steel Sprocket for Yamaha YFZ450 YFZ450R YFZ450X
This JT Sprockets 39 tooth rear steel sprocket (39T) provides reliable power transfer and durability for Yamaha YFZ450, YFZ450R, and YFZ450X models, serving as a direct replacement OEM cross-reference JTR278.39.
Overview
This 39 tooth rear steel sprocket is a high-strength replacement designed for Yamaha YFZ450, YFZ450R, and YFZ450X ATVs, delivering precise engagement and long wear. The 39T sprocket offers a slight gearing change for improved top speed or acceleration depending on riding style.
Built For Performance
- Made from hardened steel for maximum wear resistance
- 39 tooth count fine-tunes final drive ratio
- Precision machined teeth for smooth chain engagement
- Lightweight design reduces unsprung weight
- Corrosion-resistant finish for extended life
Fits These Machines
- for Yamaha YFZ450
- for Yamaha YFZ450R
- for Yamaha YFZ450X
On-The-Job Use
- Sport riding and recreational trail use
- Competitive ATV racing and motocross
- Replacement during chain and sprocket maintenance
Specs At A Glance
| Tooth Count | 39 |
| Material | Steel |
| Position | Rear |
| Fitment | Yamaha YFZ450/YFZ450R/YFZ450X |
Good To Know
Q: Will this 39T sprocket improve my top speed over stock? A: A 39T sprocket (one tooth less than stock) typically increases top speed slightly, but reduces acceleration; verify your stock gearing first.
Q: Does this sprocket require any special tools to install? A: Installation uses standard tools; you may need a chain breaker and a torque wrench for rear axle nut.
Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.
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