Bring Sur-Ron Ultra Bee braking performance to your high-performance e-bike with the MACEMX Ultra Bee Brake Kit. This complete conversion package combines a pre-bled Ultra Bee rear brake assembly, MACEMX adapter bracket, upgraded oversized rotor, and required mounting hardware.
Designed specifically for e-bikes with standard caliper mounts, the kit provides the components needed to adapt the larger Ultra Bee braking system to compatible Super73, GhostCat, P-51, Macfox, Ridstar, Freego, and similar builds.
Important: This kit is intended for compatible e-bikes, not e-motos, due to rotor fitment requirements.
What’s Included
- Pre-Bled Sur-Ron Ultra Bee Rear Brake Assembly
- MACEMX Ultra Bee Brake Adapter Bracket
- Upgraded Thickened 220mm or 240mm Rotor
- Required Mounting Hardware
Confirmed Fitment
220mm Rotor
- Super73 RX
- Super73 S2
- Super73 ZX
- Super73 Z Miami
- Macfox compatible models
- Ridstar Q20
240mm Rotor
- GhostCat F4X
- P-51 Ace
- P-51 Bullet
- P-51 Ranger
- Freego X2
Rotor Sizing
Ultra Bee brake conversions require a rotor approximately 40mm larger than the bike’s stock rotor.
For example:
180mm stock rotor → 220mm rotor
Always verify your current rotor and mounting configuration before ordering.
Brake Mount / Bracket Fitment
Some e-bikes, including certain Macfox models, may require replacing the factory brake post with a standard 180mm post-mount adapter before installing the MACEMX bracket.
A compatible mount may be required and is not included unless specifically stated.
Pre-Bled Brake System
The Ultra Bee brake assembly arrives pre-bled from the factory for easier installation.
Shipping and handling can occasionally introduce small air bubbles into a hydraulic brake system. If the lever feels soft or spongy after installation, a minor brake bleed may be required to restore proper lever feel and braking performance.
Important
This is a performance brake conversion. Proper rotor alignment, caliper positioning, mounting hardware, clearance, and hydraulic brake operation should be verified before riding.
By purchasing this product, you acknowledge the applicable Terms of Service.
Vendor: MACEMX
Collection: Curated by K. Mods