Ultra Bee Brake Upgrade Kit for E-Bikes — Super73, Macfox, Ridstar & More

Ultra Bee E-Bike Brake Kit – Moto-Grade Rear Brake Upgrade

This moto-grade hydraulic brake system is engineered for the heavier loads and higher speeds of modern e-bikes like Macfox, Ridstar, Super73, Zooz, Freego, and many other similar-style e-bikes — delivering far more braking power, control, and reliability than stock bicycle brakes. After months of real-world testing and rider feedback, this Ultra Bee brake conversion fits these bikes exceptionally well, coasts clean for wheelies, and offers outstanding modulation. Ships free — same/next day.

Choose Your Caliper: OEM or Replica

This kit comes with your choice of two caliper options so you can match your budget and your build:

• Full OEM Ultra Bee Brake System – The genuine Ultra Bee caliper and brake system. Delivers the strongest braking power, more back pressure for sharper lever feel and modulation, and the highest overall build quality for riders who want no-compromise performance and the best possible feel.
• Replica Ultra Bee Brake System – A lower-cost replica caliper that still delivers strong, reliable braking power. Compared to the OEM system, the replica is slightly less powerful with a bit less back pressure, so lever feel is marginally softer, and overall build quality is a step below the genuine unit. A great-value option for riders who want a major upgrade over stock or typical MTB brakes at a lower price.

Both options bolt on using the included conversion mount and deliver dramatically stronger, more reliable stopping power than your stock e-bike brakes or any typical MTB brakes. The difference comes down to feel, back pressure, and build quality — the OEM system is the top-tier choice, while the replica offers strong performance for less.

What's Included

• Pre-Bled Rear Ultra Bee Brake System – Moto-grade hydraulic brake built for the heavier loads and higher speeds of e-bikes. Choose OEM or replica caliper.
• 220mm Rotor – Large-diameter rotor for strong braking power, better feel, and improved heat distribution.
• Ultra Bee Brake Conversion Mount – Adapts your stock brake mount to fit the Ultra Bee brake system for a clean install.

Compatible E-Bike Models

The Ultra Bee brake kit is designed to fit Super73 (Super 73 / ZX / RX / S2), Macfox (Mac Fox X1 / X1S / X2 / X7), Ridstar (Rid Star Q20 / Q20 Pro / E26), Zooz (Ultra Urban / UU), Freego, and many other similar-style e-bikes. The included conversion mount adapts your stock rear brake mount for a clean, bolt-on install.

Please note: Some Macfox models — including the Macfox X2 and Macfox X7 — may require replacing the stock brake post with a standard 180mm post mount adapter. These are inexpensive and widely available — here's the adapter we recommend on Amazon.

Rotor Size

This kit ships with a 220mm rotor — confirm it clears your bike's stock setup before install. Need a 240mm rotor instead? Email us before ordering and we'll swap it.

Installation Notice

While this kit may be straightforward to install, we recommend professional installation. Use of this product may void the manufacturer's warranty. Use at your own risk. See our full product safety warnings and disclosures here.