Grin Technologies Triple Bob
Seriously, one of the hidden hero products we offer for an e-bike build. This is a must accessory add-0n that serves as a vital insurance policy for your customers’ expensive battery packs. It solves the #1 failure point in DIY conversions: the dreaded “battery wobble” that eventually rips water bottle eyelets right out of the frame.
The Grin Technologies Triple Bob is the definitive solution for riders who refuse to compromise on the structural integrity of their bike. While most DIYers are tempted to simply bolt their 10lb battery into their existing water bottle rivets, we strongly discourage this practice. Standard eyelets were designed for a 1lb bottle of water, not a high-capacity lithium-ion pack. The Triple Bob, CNC-machined from solid aluminum in Canada, provides a wide, flat platform that eliminates side-to-side play and wobble by creating a rock-solid point of contact along the entire tube. It’s a fan favorite, not just at Duo Designs but all over the world because it turns a standard conversion into a professional-grade build that can handle the vibrations of the road and the trails.
- Secure means of attaching a Hailong-1, 21700, and Reention case battery to any location on the bike frame (top, down,or seat tube)
- CNC machined from solid aluminum to provide a wide and flat platform on the left/right sides with a chamfered center that sits on the tube, offering a seated positioning
- Secured with 3 M5 bolts (included)
- Machined channels allow up to 3 hose clamps to keep the battery bracket/mount tightly in place
- Designed and Made in Canada by Grin Tech
Technical Details
- Package weight: 0.19 kg (0.4 lbs)
- Product weight: 0.05 kg (0.1 lbs)
- Item Dimensions (L x W x H): 7.87 x 1.1 x 0.28″
- Frame Material: Aluminum
These pieces are CNC machined from solid aluminum stock and provide a wide and flat platform for the battery cradle to rest, secured with three M5 bolts so there is none of the rocking or play that is sometimes present with water bottle eyelets. Machined channels allow up to 4 hose clamps to keep the battery tightly in place, and comes with heat shrink for hose clamps. Designed and made in Canada by Grin Tech.




