Description
A tired stock sprocket on a YZ125-250 or YZF250-450 shows up first as chain slap, then as a rougher-feeling power delivery out of slow corners, and swapping to a purpose-built aluminum sprocket clears both up. This Renthal rear sprocket, part number 150U-520-50GBPE, is machined from 7075-T6 aluminum that comes in around 33 percent lighter than a comparable steel piece, cutting rotating weight right where it matters most for acceleration and quick direction changes.
Why this sprocket earns its price:
- Reduced rotating mass at the rear wheel means less rotational inertia for the engine to overcome out of every corner
- Grooved face design sheds mud and debris instead of packing it against the chain
- Direct bolt-on fitment for the specified KTM/Husqvarna platform, no adapters or spacers required
- Special tooth profile lets the chain roll on and off the sprocket smoothly instead of binding at each link
Available at 50 teeth for 520 chain across the 99-and-up YZ125-250/YZF250-450 family, stocked and shipped by IPD Racing without the wait of a special order. Priced at $104.95, it is a genuine Renthal part backed by the manufacturer, and the 99+ Yamaha YZ125-250/YZF250-450 fitment is confirmed against the Renthal 99+ Yamaha YZ 125-250/ YZF250-450 Rear Grooved Sprocket – Purple 520-50 Teeth spec before it ever hits our shelf.
