Restore proper chain alignment and prevent dangerous derailments with this Universal Parts Replacement Chain Tensioner Assembly. Specifically engineered for the Razor Dirt Rocket and Electric Sport Bike series, this spring-loaded tensioner automatically maintains optimal chain tautness across rough terrain, protecting your motor sprocket and rear drive assembly from premature wear.
A failing or bent chain tensioner causes excessive chain slap, decreases battery efficiency, and can cause the chain to jump off completely during sudden acceleration.
Product Features
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Direct OEM Specification Match: Manufactured to match the exact fit and spring rate of Razor factory part number W15128050079.
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Durable Construction: Heavy-duty steel bracket arms and a high-density composite roller wheel engineered to withstand dirt, mud, and vibration.
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Complete Setup: Arrives as a unified bracket assembly ready to mount directly into the factory chassis bracket.
Specifications
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Manufacturer Part Number (MPN): W15128050079
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Type: Dynamic Spring-Loaded Roller Tensioner
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Material: Zinc-plated steel housing with an impact-resistant composite roller.
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Hardware Note: Reuses factory frame mounting bolts.
Model Fitment & Compatibility
This replacement assembly is verified for all manufacturing versions (Versions 1+) of the following Razor electric platforms:
| Vehicle Series |
Specific Model Applications (Version 1+) |
| Razor Dirt Rocket |
MX350 Dirt Rocket, MX400 Dirt Rocket (All Colors/Variants) |
| Razor Electric Sport |
RSF350 Electric Sport Bike |
Tech Tip: While replacing the tensioner, always inspect your rear wheel alignment and check your chain for stiff links or excessive stretching. A worn-out chain will continue to jump even with a brand-new tensioner installed.
California Prop 65 Warning
Model Fitment
MX350 Dirt Rocket, MX400 Dirt Rocket,
