XIKOBY Rear Sprocket Freewheel Chain Kit for Razor & Mini Bikes — 25H 132-Link Chain, Guide Plates

When your dirt bike's rear drive starts to rattle, slip, or wear out, swapping multiple parts can restore smooth, reliable power transfer. The XIKOBY Rear Sprocket Freewheel Chain Plate Guide Assembly bundles the main rear-drive components—sprocket, freewheel, chain, guide plates, and installation tools—so you can replace the whole system at once. This kit is engineered for compatibility with popular electric and petrol mini bikes, using a 25H pitch drivetrain to match OEM geometries.

Which bikes and versions does this kit fit?

This assembly is designed to replace the rear drive parts on several Razor and mini motocross models. Check your bike’s version number to confirm compatibility before purchasing.

• Razor MX650: compatible with versions 15 and later
• Razor MX500: compatible with versions 22 and later
• Razor SX500: compatible with versions 1 and later
• Also fits Mcgrath dirt bike, RSF650 pit bike and similar mini moto models with 25H pitch

What components are included and what are their specifications?

The kit supplies the main hardware needed to rebuild the rear drive. Parts are matched by pitch and tooth count so the system runs smoothly together and minimizes setup time.

• Full 25H chain, 132 links, with 8 master links for easy sizing
• 25H 13T motor sprocket included as an extra replacement
• Rear sprocket with integrated freewheel mechanism and chain plate guides
• Chain breaker tool and spring-loaded chain tensioner with bearings and lock nut

How does this kit improve performance and durability?

The assembly focuses on strength and alignment to reduce slippage, premature wear, and drivetrain noise. Material choices and heat treatment boost tensile strength and resistance to abrasion for longer service life under off-road conditions.

• High-strength steel alloys and heat-treated sprockets resist deformation and wear
• 80-tooth guide design supports positive chain tracking during acceleration and jumps
• Chain tensioner maintains alignment and prevents chain drop, increasing safety and uptime
• Included master links and breaker make chain length adjustment straightforward

What tools and steps are needed for installation?

The kit includes the essential tools for most repairs so you can perform the swap at home or in a small workshop. Basic mechanical skills are recommended, along with common hand tools for wheel removal and torqueing fasteners.

• Chain breaker to size the 132-link chain to your bike
• Master links for secure chain rejoining without special press tools
• Chain tensioner assembly with spring and lock nut for correct tensioning
• Standard wrenches and sockets required for sprocket and wheel mounting

Who is this for: This XIKOBY rear sprocket and chain assembly is aimed at riders, mechanics, and DIY enthusiasts who need a complete rear-drive replacement for Razor MX650/MX500/SX500 models and similar mini motocross bikes. It’s especially useful if you want matched components—sprocket, freewheel, guides, and a full 25H chain—delivered together to reduce compatibility issues and installation time. If your bike suffers from chain stretch, noisy freewheel engagement, or frequent chain drop, this kit provides a durable, ready-to-install solution that restores drivetrain function and extends part life.