Razor Sprocket and Freewheel for MX500/MX650/RSF350/SX500
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Drive System Restoration: Razor Sprocket & Freewheel
Restore the smooth power delivery of your electric dirt bike with the Universal Parts Sprocket and Freewheel Assembly. Engineered specifically for high-torque Razor motors, this complete unit replaces worn, slipping, or "frozen" rear drive assemblies. By combining a precision-machined sprocket with a heavy-duty internal freewheel, this assembly ensures your chain grabs instantly during acceleration and coasts freely when you let off the throttle.
Technical Performance Features
- Complete 3-Piece Assembly: Includes the drive sprocket, high-engagement freewheel, and a protective outer guard to prevent chain derailment or debris interference.
- OEM Thread Precision: Features a standard M34 x 1.00 thread pitch for a seamless "spin-on" installation to your factory rear wheel hub.
- Durable Steel Construction: Designed to withstand the high-torque demands of 500W and 650W motors without premature tooth wear.
- #25H Chain Optimized: Specifically profiled for #25H "Heavy Duty" chains, ensuring maximum contact area and reduced mechanical noise.
Comprehensive Fitment Guide
This assembly is a direct-fit replacement for the following Razor electric vehicles:
| Model Family | Version Compatibility |
|---|---|
| Razor MX500 / MX650 | MX500 (V22+) / MX650 (V15+) |
| Razor SX500 / McGrath | Versions 1 and up |
| Razor RSF350 | Electric Sport Bike (Standard Fitment) |
| Razor MX350 / MX400 | Compatible with select mid-frame versions |
Technical Specifications
- Chain Size: #25H
- Thread Pitch: M34 x 1.00
- Outer Diameter: 7 Inches
- Cross-Ref Part #: W15165070142, W15128199013
Mechanic's Note: If your motor is spinning but the rear wheel isn't moving, your internal freewheel has likely failed. Installation Hack: These are "spin-on" parts that tighten as you ride. Pro Tip: To remove the old one, you may need a Freewheel Removal Tool or a hammer and punch—don't forget to apply a small amount of anti-seize to the threads before installing the new unit to make future service easier!
SKU: 119-241
Vendor: Universal Parts
Shipping information
Orders are prepared as quickly as possible. Delivery times and shipping costs are calculated at checkout based on the destination and items ordered.
Returns & warranty
Please verify fitment and part number before ordering. Contact Thrifty Scooters promptly if an item arrives damaged or incorrect.