Special thanks to Mark at Alcon Welding Small Engine Repair and CNC Machining for doing the welding and getting it exactly to specs and dead straight. It was something like jigging up an I.U.D. for a blue whale! Check out the Alcon site at http://www.alconshop.com No project is too twisted for Mark to wrap his head around. Thanks again, Mark: the kids are having a blast! |
of threaded hub shells welded together in the center. The final drive sprocket was welded to the inside of the "new" right side hub flange. A single-speed freewheel was threaded on to the right side of the custom shell; on the left side another single speed freewheel was threaded on "backward" and welded so it wouldn't unscrew under torque. The back crank is left-side drive: I'll have to make sure the pedals stay tight, because the bearing friction will want to unscrew the pedals. The front crank is right-side drive and there is a rear derailleur as a chain tensioner. I had some old GT mags hanging around with an 18- tooth freewheel. Either crank can coast or pedal independently; it makes tandem riding less awkward. There's 30 inches between the bottom brackets just in case I want to put the seat up and get on the front. |
Mike Watson's "Rube Goldberg" Kid's Tandem |
As you can see, the tandem is pretty simple: two frames welded together (not even chopped!) Bolted onto the rear dropouts of the front frame is a custom hub shell. The hub shell consists of two right side halves, |
Special thanks to Mark at Alcon Welding Small Engine Repair and CNC Machining for doing the welding and getting it exactly to specs and dead straight. It was something like jigging up an I.U.D. for a blue whale! Check out the Alcon site at http://www.alconshop.com No project is too twisted for Mark to wrap his head around. Thanks again, Mark: the kids are having a blast! |
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