Ultra Bee Brake Kit for Super73, P-51, GhostCat, and More Designed for ultimate braking capability Bracket to adapt the rear caliper. This kit is for E-Bikes with standard caliper mount not E-Motos because the brake rotor does not fit What’s included: Pre-Bled Ultra Bee Rear Brake Assembly MaceMX Ultra Bee Brake Bracket Mounting Hardware Upgraded thickened 220/240MM Rotor All required hardware comes with our kits Confirmed Compatible with: Super73 RX, S2, ZX, Z-Miami (220MM ) GhostCat F4X (240MM) P-51 Ace, Bullet, Ranger (240MM) Macfox (220MM) Ridstar Q20 (220MM) Freego X2 (240MM) Bracket Fitment: Some E-Bikes models including some of the Macfox bikes require replacing the stock brake post with a standard 180mm post mount adapter If your e-bike encounters this issue, here is a link to purchase a proper fitting mount (https://www.amazon.com/dp/B08D9JRTGB?th=1) Ultra Bee Brakes require the brake disc that is ~40mm wider than the stock rotor Brake Bleeding Brakes are pre-bled at the factory before shipping, but it’s normal for them to sometimes require a minor bleed after installation or transit. Small air bubbles can occasionally work their way into the system during shipping or handling. If the brake feels spongy or doesn’t have the performance you’d expect, a quick bleed should restore it to full performance. By purchasing this product you are acknowledging our Terms of Service Status: *back-order, next batch ships mid-august*