Renthal - Sprocket - 49T - 2005
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Product Information
Full details
The Renthal Ultralight Rear Sprocket is designed for motorcycle riders, particularly those in motocross and enduro, seeking improved performance and durability. Its key benefit lies in its lightweight construction and robust build, offering a balance of reduced unsprung weight and long-lasting performance. A potential caveat is the specific fitment, requiring careful verification against your motorcycle model and year.
All features
| Release Year | 2005 |
|---|---|
| Model Part Number | 123U-520-49GYBK |
| Brand | Renthal |
Extended Product Information
FAQs
What is the primary benefit of an 'Ultralight' sprocket?
The 'Ultralight' designation signifies a significant reduction in weight compared to standard steel sprockets. This lower rotational mass improves acceleration, reduces unsprung weight for better handling, and can make the motorcycle feel more agile.
How does a 49T rear sprocket affect performance?
A 49-tooth rear sprocket is larger than stock (common stock counts are often lower). This increases the gear ratio, resulting in stronger acceleration and more torque, which is beneficial for off-road riding and technical terrain. However, it will typically reduce the motorcycle's top speed.
What is the expected lifespan of a Renthal Ultralight sprocket?
The lifespan varies greatly depending on riding conditions, maintenance, and the condition of the chain and front sprocket. However, Renthal Ultralight sprockets are known for their durability due to advanced materials and manufacturing, generally offering a longer service life than basic steel sprockets when properly maintained.
Do I need to replace my chain and front sprocket when installing this rear sprocket?
It is highly recommended to replace the chain and front sprocket at the same time as the rear sprocket, especially if they are also worn. Running a new sprocket with a worn chain or front sprocket can significantly reduce the lifespan of all components.
What maintenance is required for this sprocket?
Regular cleaning with a degreaser and consistent lubrication with a quality chain lube are essential. Inspecting for wear and ensuring correct chain tension are also crucial maintenance steps.
Is the black finish durable?
Yes, the black finish is typically a durable anodization that provides good resistance to corrosion and minor abrasions. However, like any finish, it can wear over time with heavy use and exposure to the elements.
Troubleshooting
Chain skipping or poor engagement
Ensure the sprocket is correctly seated on the hub and that the chain is properly aligned and tensioned. Check for worn chain or front sprocket.
Excessive sprocket wear
Verify chain lubrication and tension are maintained correctly. Ensure the chain and front sprocket are not worn and are compatible with the rear sprocket. Riding in abrasive conditions without proper cleaning can accelerate wear.
Noise from the drivetrain
Check chain tension and lubrication. Inspect for any debris caught between the sprocket and chain guard, or between the chain and sprockets.
Sprocket does not fit correctly
Double-check the part number and confirm your motorcycle's make, model, and year match the product's specified fitment. Ensure no obstructions are present on the hub.
Pros and Cons
Pros
- Significantly reduces unsprung weight for better handling.
- Exceptional durability and resistance to wear.
- Improves acceleration response.
- Favored by professional riders for its performance.
- High-quality manufacturing standards.
Cons
- Specific fitment requires careful checking against motorcycle model and year.
- May require other drivetrain components (chain, front sprocket) for optimal compatibility.
- Higher initial cost compared to standard steel sprockets.
- Requires correct installation to achieve full benefits.
- The 49T count may not be suitable for all riding styles or terrains.
Setup, Compatibility & Care
Compatibility: This Renthal Ultralight Rear Sprocket (123U-520-49GYBK) is designed for specific Suzuki models including the RM 125/250 (1992-2008), RMZ250 (2007-2024), and RMZ450 (2005-2024). Always verify that your motorcycle's make, model, and year fall within these specifications before purchasing. Ensure your existing chain and front sprocket are compatible with a 520 pitch chain and the new 49-tooth count.
Setup: Installation should be performed by a qualified mechanic or an experienced individual familiar with motorcycle drivetrain maintenance. Proper alignment and torque specifications are critical for safety and performance. Ensure the sprocket is mounted securely to the hub and that the chain is correctly tensioned according to your motorcycle's service manual.
Care: To maximize the lifespan of your Renthal Ultralight sprocket:
- Regular Cleaning: Clean the sprocket and chain regularly, especially after riding in wet or muddy conditions. Use a degreaser and a brush to remove dirt and debris.
- Lubrication: Apply a quality motorcycle chain lubricant appropriate for your riding conditions after each cleaning and periodically between rides.
- Inspection: Frequently inspect the sprocket teeth for signs of excessive wear or damage. Check the chain for stretching or kinking. Replace worn components promptly to prevent damage to other parts of the drivetrain.