RZEOZU Mini Bike Rear Disc Brake Kit for 79–105cc (CT100U/DB30) — 180mm Rotor, Complete Lever & Cable

If your minibike uses a rear disc setup and you're looking for a reliable, direct-fit replacement that improves heat dissipation and stopping consistency, this RZEOZU kit is engineered for that purpose. It bundles a disc rotor, rear caliper, brake lever and cable sized specifically to fit a wide range of minibike models from Coleman, Baja, Motovox, Monster Moto and other common manufacturers. The design emphasizes durability and predictable braking without altering your bike's original mounting points.

Which minibikes will this RZEOZU disc brake kit fit?

This kit was created to match common mounting and cable dimensions used on many small-engine minibikes. Check your bike's model and rear caliper mounting distance before ordering; it's intended as a rear brake only.

• Compatible models: Coleman CT100U, CC100X; Baja Motorsports Doodlebug DB30; Motovox MBX10/MBX11; Monster Moto Mega Moto 80/105; FR* GMB100 and similar 79–105cc minibikes.
• Designed as a rear caliper replacement — not for front brake swaps.
• Verify your bike’s existing caliper mounting bolt spacing and cable routing before purchase.

What are the critical dimensions and cable specs?

Dimensions are provided so you can confirm compatibility with your bike’s frame and mounting points. The brake cable and rotor size are purpose-matched for typical minibike rear brake layouts.

• Brake rotor diameter: 180 mm (7.08") for reliable contact area.
• Caliper mounting hole distance: 51 mm (2.01") to match common rear brackets.
• Cable overall length: 61" with 55" sleeve and 4.96" moving length for standard routing.

How does the upgraded rotor and caliper affect braking performance?

The rotor is patterned to disperse heat and resist fade during repeated stopping, while the caliper is built for firm pad engagement. Together they deliver steadier, repeatable braking under normal riding conditions without requiring frame modifications.

• Rotor geometry improves air flow and heat dissipation under load.
• Caliper set provides consistent pad contact pressure for predictable lever feel.
• Direct-replacement fit keeps installation straightforward and reversible.

What should I know about installation and compatibility notes?

Installation is typical of mechanical disc brake assemblies but requires verifying mount spacing and cable routing. This kit supplies the components sized for rear brake applications; it does not include front-specific calipers or adapters.

• Confirm rear caliper mount spacing (51 mm) and rotor clearance before purchase.
• Use standard tools for cable routing, lever installation, and caliper mounting.
• Bleeding is not required for mechanical cable-actuated setups—adjust cable tension and pad alignment instead.

Who is this for: Riders or mechanics maintaining or restoring 79–105cc minibikes that use a rear disc brake and need a dependable replacement or upgrade. Choose this RZEOZU kit if you want a bolt-on rear disc solution with defined dimensions, improved rotor cooling, and a complete cable-and-lever assembly that fits popular minibike platforms.