Renthal Ultralight Rear Sprocket - 50T Blue
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Product Information
Full details
The Renthal Ultralight Rear Sprocket (50T Blue) is designed specifically for motocross and enduro riders who demand professional-grade durability and weight reduction for competitive performance. It offers a specialized grooved design to maintain chain contact and improve longevity under harsh racing conditions, though riders should note it is engineered for specific 85cc model compatibility and requires routine maintenance to preserve its precision finish.
All features
| Model Part Number | 441U-428-50GPBU |
|---|---|
| Brand | Renthal |
Extended Product Information
FAQs
Is this sprocket compatible with a 520 chain?
This specific part number (441U-428-50GPBU) is intended for a 428-pitch chain. Please check your chain size before purchase.
Does the blue coating peel off?
The blue color is an anodized finish, which is integrated into the metal surface and resists peeling better than paint, though it can fade or scratch under heavy use.
How often should I replace my sprocket?
Replace the sprocket when teeth become sharp, 'hooked', or thin. It is best practice to replace the chain and both sprockets as a set.
Can I use this on a street-legal bike?
This sprocket is engineered specifically for motocross and enduro applications and is optimized for off-road performance, not sustained high-speed highway use.
What is the benefit of the 'grooved' design?
The grooves allow mud, dirt, and sand to pass through rather than packing into the teeth, which keeps the chain running smoothly.
Troubleshooting
Chain jumping or slipping during acceleration
Check chain tension for proper slack and inspect sprocket teeth for premature wear or 'hooking'.
Excessive noise during operation
Ensure the rear wheel is perfectly aligned and the sprocket is properly seated on the hub with all bolts torqued correctly.
Sprocket finish showing surface scratches
This is normal during standard operation due to grit; ensure the chain is regularly cleaned and lubricated to minimize abrasive wear.
Pros and Cons
Pros
- Significantly reduces unsprung weight for better handling
- Grooved design effectively clears mud and dirt
- Trusted brand with a long history in professional racing
- High-quality anodized finish for added durability
Cons
- Specific compatibility limited to select 85cc models
- Requires professional installation for proper alignment
- Performance-focused material may wear faster than heavy steel alternatives
Setup, Compatibility & Care
Compatibility is strictly limited to the following models: GAS GAS MC85 (2021-2024), KTM SX85 (2003-2024), and Husqvarna TC85 (2014-2024). During installation, ensure the mounting bolts are tightened to the manufacturer's specified torque settings using a calibrated torque wrench. It is critical to inspect the sprocket teeth periodically for signs of hooking or excessive wear. For cleaning, use a dedicated chain cleaner and a soft-bristled brush to remove grime; avoid harsh chemicals that may strip the anodized blue coating. Always pair a new sprocket with a new chain to prevent premature failure of both components.