Mark Stonich's Sidecar Goodies
Mark showed an aluminum replacement for the heavy steel EZ1 handlebars. It uses bars like his Evo bars but even narrower, and it has just a single tube coming up from the steerer tube. This allows for tight turns with less tiller and less leg interference, which will be a good thing on the sidecar rig he is working on now. The riser uses plates at the bottom between the riser tube and a sideways tube that fits into an aluminum MTB handlebar stem, and the top end has a cut off piece of another aluminum stem to hold the handlebars. Carl confirmed that it is easy to cut a LOT of weight off an EZ1 by doing something like this (he just swapped for aluminum Tour Easy pieces), and when Mark passed around the old and new bars the difference in weight was astounding.
Mark will be using the modified EZ-1 he showed last month in a sidecar rig for a mother and her handicapped daughter. The daughter has very limited range of motion and strength, so she will be doing basically passive exercize while the mother provides the power. He showed the pedal setup he is making for the sidecar, which is a pretty slick one-sided Z shape with a clutch that connects or disconnects it from the main drive. It has big platform pedals, one adapted from a conventional pedal and the other made from scratch with a wooden platform and bearing blocks cut out of Oil Impregnated Ultra High Molecular Weight Polyethelyne. The effective crank lengths are about 4 inches (or 100 mm). The bike will cost about $4,500, but this is way less than the $25K or so that a succession of engineering firms have charged the mother for pedallable trailer rigs that either worked poorly or were never even completed. Mark is also building all the non-standard bits to have a service life of twenty years, making it an even better deal. For the $4500, Mark will also be supplying a custom Ray Allison rear rack with two unequal length rails and detachable ramps to transport the sidecar rig.
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