Renthal Ultralight Rear Sprocket (50 Tooth, Silver) 189U-420-50GRSI - Honda CR80R / CR85R / CRF150R 1986-2025

Product Description

Upgrade your drivetrain with the Renthal Ultralight Rear Sprocket, engineered for maximum power transfer and reduced unsprung weight on your Honda. Designed for serious off-road and motocross riders, this sprocket combines high-strength materials with precision CNC machining to deliver uncompromised durability.

Crafted from specially enhanced 7075-T6 aluminum, this rear sprocket is 33% lighter than steel equivalents while maintaining exceptional tensile strength. The specialized tooth profile promotes smooth chain engagement and disengagement, minimizing noise and wear to keep your bike performing at its peak.

Top Features: Renthal Ultralight Rear Sprocket

• CNC-machined construction replaces stamping with a computer-aided ultra-light design to cut unsprung weight and maximize power transfer.
• Manufactured from high-strength, specially enhanced 7075-T6 aluminum that is 33% lighter than steel without sacrificing structural strength.
• Specialized tooth profile allows the chain to roll easily on and off the sprocket for extended wear life, reduced noise, and increased efficiency.
• Engineered specifically for 420 chain size applications across a wide range of Honda off-road and motocross models.

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: Is this sprocket lighter than a stock steel sprocket?
A: Yes, it is constructed from specially enhanced 7075-T6 aluminum that is 33% lighter than steel to significantly reduce unsprung weight.

Q: What chain size does this sprocket require?
A: This sprocket is designed specifically for a 420 chain size.

Expert Pro-Tip

Expert Pro-Tip: Always inspect your front sprocket and drive chain whenever you replace your rear sprocket. Installing a new aluminum rear sprocket on a worn chain or hooked front sprocket will cause premature wear and reduce the lifespan of the components.

Recommended Pairings:

• Honda 4-Stroke Performance Parts
• MX Off-Road Chains
• Motorcycle Tools & Accessories

About Moto-House MX

At Moto-House MX, we carry the best brands in motocross and off-road performance. Our team has over 40 years of experience helping riders get more out of their bikes. We pride ourselves on great customer service, and every item ships FAST - straight to your door.

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