Universal E-Bike Battery Mount Adapter Rail (Slotted, 266mm)

ElectricAllWheel Universal E-Bike Battery Downtube Adapter Rail (266mm Adjustable) Struggling to mount a battery where your frame doesn’t line up? This is the solution. The ElectricAllWheel Universal Downtube Adapter Rail is designed to give you the flexibility to install or reposition an e-bike battery on frames where standard mounting points don’t match up. Whether you’re adding a second battery, upgrading your setup, or working with a non-standard frame, this rail bridges the gap—literally. Built for real-world installs, this adapter gives you adjustability, strength, and a clean finished look without drilling or compromising your frame. What This Solves Battery mounts that don’t align with your frame bosses Limited downtube mounting options Dual battery installations Custom or aftermarket battery setups Key Features Universal Downtube Fitment Works with most e-bike battery bases including common HaiLong-style (dolphin) mounts Adjustable Slotted Design Dual slots allow forward/backward positioning to dial in perfect fitment Multi-Hole Mounting Pattern Evenly spaced threaded holes give maximum flexibility across different frames and battery mounts Rigid Aluminum Construction Strong, lightweight, and built to handle battery weight and vibration Clean Install – No Guesswork Designed for straightforward installs with a professional result Dimensions & Layout Total Length: 266mm (10.49”) Width: 30mm (1.18”) Mounting Hole Pattern Threaded holes spaced at: 20mm (0.79”) increments Provides broad compatibility with frame mounting bosses Adjustment Slots Multiple slot sections for flexible positioning: 30mm (1.18”) 34mm (1.34”) 30mm (1.18”) Slot Offset: Begins approximately 20mm (0.79”) from upper section Allows precise front-to-back battery alignment Edge Spacing Initial edge margin: 30mm (1.18”) Designed to maintain strength while maximizing usable adjustment range Perfect For Adding a second battery to your e-bike Fixing misaligned factory mounting points Custom builds and frame modifications Upgrading to larger or aftermarket battery packs Pairing with ElectricAllWheel dual battery kits What’s Included (1) Universal Downtube Adapter Rail Mounting hardware (as shown) 4 - M5*12 Screws (Panhead - Phillips)