Description
If your RM or RMZ still has the factory steel sprocket bolted up, you’re carrying rotating weight that Renthal solved decades ago with a purpose-cut aluminum alternative. This Renthal rear sprocket, part number 123U-520-50GYPE, 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:
- Anodized purple finish holds up to UV exposure and repeated pressure washing better than a painted sprocket
- Grooved face design sheds mud and debris instead of packing it against the chain
- Smoother chain engagement translates to a quieter drivetrain and noticeably less vibration at speed
- Special tooth profile lets the chain roll on and off the sprocket smoothly instead of binding at each link
This 50-tooth version bolts straight to the 89-and-up RMZ250-450/RM125-250 rear hub, and IPD Racing carries the full tooth-count range so you can dial in gearing without guesswork. Priced at $104.95, it is a genuine Renthal part backed by the manufacturer, and the 89+ Suzuki RMZ250-450/RM125-250 fitment is confirmed against the Renthal 89+ Suzuki RMZ250-450/ RM125-250 Rear Grooved Sprocket – Purple 520-50 Teeth spec before it ever hits our shelf.
