GREHUA 420 Split Chain Sprocket 42-Tooth for Mini Bike Coleman CT200U — Red 2‑Piece Aluminum, Easy Install

GREHUA 420 split chain sprocket 42-tooth is a lightweight, easy-to-install replacement sprocket and hub assembly engineered to convert or upgrade mini bikes and go-karts like the Coleman CT200U without removing the axle.

This split sprocket kit pairs a red 42-tooth outer sprocket with a black anodized hub adaptor, offering a convenient way to change gear ratios, reduce rotating mass, and restore worn drive components. Made from aluminum alloy, the set is built to be light yet durable and includes the fasteners needed for mounting. Its split design lets you swap sprockets quickly and experiment with ratios on the trail or in the garage.

How does the GREHUA split sprocket make gear changes faster?

The two-piece (split) design separates the outer sprocket from the hub, so you don't have to slide the axle out to swap gears. That saves time during tuning or repair and minimizes disassembly.

• Split outer sprocket for tool-friendly swaps
• Includes six bolts and nuts for secure attachment
• Change ratios trackside without removing wheel or axle
• Designed for 420 chain and 42 teeth sizing

Which machines and bolt patterns is this sprocket compatible with?

The hub is made to suit many small-frame bikes and go-karts that use a 6-bolt wheel pattern and accept a 420 chain sprocket. The center hole and flange pattern match common mini bike models, and minor modifications can expand fitment.

• Factory compatibility: Coleman CT200U / CT200U-EX, CT100U
• Also fits: Baja Warrior, Massimo, TrailMaster MB200, Motovox variants
• Works with a range of 80cc–212cc mini bikes and some go-karts
• Center hole can be adjusted for DB30 / CT100U / Motovox applications

What materials and design features deliver performance?

The hub adaptor is forged from aircraft-style aluminum and the outer sprocket uses a premium alloy to keep weight down without sacrificing durability. Tooth geometry is machined to promote smooth chain engagement and reduce friction under load.

• Lightweight aluminum construction for lower rotational mass
• Precision-cut tooth profile for reliable chain tracking
• Anodized finish resists corrosion and wear
• Forged hub for a secure clamping surface and long life

How difficult is installation for a home mechanic?

Installation is straightforward for anyone familiar with basic mini bike maintenance. The kit ships with the hardware; typical installation requires standard hand tools and around 20–45 minutes depending on model and any minor fit adjustments.

• Comes with six bolts and six nuts for immediate mounting
• No axle removal needed on most builds thanks to split design
• Requires basic wrenches and a torque check after fitting
• Minor center-hole modification may be needed for some frames

Who is this for: This GREHUA 420 split sprocket 42T kit is aimed at mini bike and go-kart owners, hobby mechanics, and small-fleet repair shops that need a reliable, lightweight replacement or upgrade. It's especially useful for riders who frequently test gear ratios, restore older machines, or want a simple way to reduce drivetrain weight without a full wheel removal. If your machine uses a 420 chain and a 6-bolt wheel pattern, this kit provides fast servicing and flexible fitment options.