Description
Blue plastic aside, the stock steel sprocket on a YZ or YZF is one of the heaviest rotating parts left on the bike once you’ve done the usual bolt-on upgrades, and this aluminum piece fixes that. This Renthal rear sprocket, part number 150U-520-49GBPE, 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:
- Machined from 7075-T6 aluminum, roughly 33 percent lighter than an equivalent steel sprocket
- Reduced rotating mass at the rear wheel means less rotational inertia for the engine to overcome out of every corner
- Even, controlled wear across the tooth face extends both sprocket and chain life
- Direct bolt-on fitment for the specified KTM/Husqvarna platform, no adapters or spacers required
This 49-tooth sprocket bolts directly to the 1999-and-newer YZ125-250 and YZF250-450 rear hub, and the IPD Racing team can help confirm your exact gearing before you place the 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 520-49 Teeth spec before it ever hits our shelf.
