Chain Tensioner for Razor MX350, MX400 Dirt Rocket / RSF350

Replacement Chain Tensioner for Razor MX350, MX400, and RSF350

This replacement chain tensioner assembly is built for the Razor MX350 and MX400 Dirt Rocket models, along with the RSF350 Electric Sport Bike. Its job is to keep the chain properly aligned, reducing the chance of derailment and the damage that can follow. Among the Razor scooter parts available, this unit self-adjusts to keep the chain tight over uneven ground, which helps the drive components last longer.

Build and Design

Made to OEM specifications, this chain tensioner pairs a heavy-duty steel bracket with a durable composite roller. Together these parts resist dirt and vibration, so the unit suits off-road use. It is designed to handle regular outdoor riding and keep working reliably over time.

Installation and Compatibility

The tensioner ships as one complete assembly that bolts directly to the factory chassis bracket. It uses the existing factory frame mounting bolts, so no extra hardware is needed for the mount. When you swap the tensioner, check your rear wheel alignment and the condition of the chain to make sure it works properly.

Specifications

• Material: Zinc-plated steel housing with an impact-resistant composite roller
• OEM Part Number: W15128050079
• Type: Dynamic Spring-Loaded Roller Tensioner
• Fits: Razor MX350 Dirt Rocket, MX400 Dirt Rocket and RSF350 Electric Sport Bike (all versions)

Fitment

Compatible with:

• Razor MX350 Dirt Rocket (all colors and variants)
• Razor MX400 Dirt Rocket (all colors and variants)
• Razor RSF350 Electric Sport Bike

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