The next time you're gasping for breath pedaling on a hill, and your buddy is gliding up it with a big grin, consider that he may be cheating with a teensy motor that slips into the frame of a bike.

[Thor] sent in an awesome motorized bike build he found coming from the fruitful workshop of [Jim Gallant]. It’s an incredible piece of work built nearly entirely from scratch. [Jim] welded the frame ...