The Duluth Cycle Dolphin Battery Downtube Mount is designed for universal compatibility with most e-bike frames—even those without water bottle cage bolt holes.
Compatibility Overview
Our mount works with:
- Round downtubes (standard diameter)
- Oval/shaped downtubes (the soft rubber padding conforms to your frame)
- Frames without bottle cage holes (no drilling required)
- DIY e-bike conversion builds
- Most dolphin-style/shark-style battery packs (the most common e-bike battery form factor)
Key Features
- CNC machined from high-quality aluminum for precision fit
- Soft rubber contact pads protect your frame's paint and conform to tube shapes
- Flexible mounting position — install anywhere on the downtube
- Reversible installation — battery can even be mounted upside down if needed for clearance
Will It Fit My Specific E-Bike?
The mount is compatible with most standard dolphin/shark-style batteries. Before purchasing, verify:
- Your battery uses the standard dolphin/shark mounting rail system
- Your downtube has enough clearance for the mount and battery
- There are no frame obstructions (cables, suspension linkages) in your desired mounting location
What's Included
- CNC machined aluminum mount
- Soft rubber frame protection pads
- All necessary mounting hardware
- Lifetime Warranty — Made in the USA
Jan 13, 2026