Originally Posted by
hillzofvalp
Other frAmes migh have an advantage in that cells could be placed in other tubes as well, but the limitation for the Downtube is the bb. An off topic question: is it safe to drill a 27mm hole in bb or is the only way to get batteries in ther be to build the bike up with them already in place?
I have a bike with a star shape cut into the bb shell, and the points may describe a 27mm circle. You need to find a bike with an eccentric bb.