RZEOZU 65T 54mm Bore Drive Chain Upgrade Kit with 108-Link Chain for Razor MX650 MX500 SX500 RSF650

Upgrade your Razor MX-series ride with the RZEOZU 65T sprocket and 108-link drive chain upgrade kit. Built for durability and reliable power transfer, this kit offers flexible gearing options designed to suit different riding styles and terrain. The combination of a 65-tooth rear sprocket and a robust 108-link chain creates a balanced setup that can feel smoother on varied surfaces, from backcountry trails to dirt park sections.

Why consider an upgrade

Raising or refining your gear ratio can influence how the bike responds under load. A larger front sprocket is typically associated with easier cruising at modest speeds and steadier throttle feel, potentially reducing wear on the drive train. A smaller front sprocket may improve hill-climbing performance and throttle immediacy, which some riders find more responsive for tight turns and quick bursts. The 108-link chain provides length and strength to help maintain consistent engagement during off-road use, reducing the chance of slippage during aggressive riding.

What’s included in the kit

• 1 x 65T rear sprocket with a 54 mm bore
• 1 x 108-link drive chain
• 1 x flywheel adapter
• 3 x motor sprockets: 9T, 11T, 13T
• 5 x master links
• 1 x chain breaker
• 4 x screws, 4 x nuts
• 3 x wrenches

Compatibility and setup notes

Designed for Razor MX650, MX500, SX500, and RSF650 models. Note: MY1020 type motors are compatible; verify the motor sprocket mounting length is 10 mm and width is 8.5 mm to ensure a proper fit on your bike.

How to choose your gearing

• Using a larger front sprocket (11T or 13T) may support faster top-end feel and smoother power delivery.
• Switching to a smaller front sprocket (9T) can enhance hill-climbing ability and throttle response.
• The 65T rear sprocket helps provide a balanced gear ratio when paired with the available front sprockets.

With the included tools and adapters, installation can feel straightforward for riders comfortable with basic maintenance. The kit is designed to withstand off-road conditions and aims to deliver a steadier, more controlled ride across varied terrain without promising guarantees. Results can vary based on the bike’s baseline setup and riding style.