I am new to this forum and I am looking for a little help.
I have a friend who has lost much of his sense of balance. So he doesn't get out much anymore. His wife and I are trying to find things to do that can coax him out of the house more. I recently discovered 'adult' tricycles and thought this might be a good idea.
We found a model at KMart and it had an interesting rear configuration. The rear wheels were bolted onto the frame in place of a normal rear tire. The drive mechanism used what looked similar to a normal rear axel (without the rest of the wheel) and a 'transfer sprocket' and short chain leading to two rear wheels.
Although he wouldn't say it, I could tell my friend did not like the trike. I think it was because it had no 'cool factor' at all. It looked like something an old lady would ride.
So, my thought is that maybe I can find a trike conversion kit like the one I described that can be mated to a normal mountain or hybrid bicycle. The advantage of this is that it would look way cooler, but could also take advantage of the 21,24,27 speed gearing of the bike, transmitted to the conversion rear. This should allow him to get a little speed, while still offering three wheel stability, with a relatively lightweight.
When I search this site and the www in general looking for a conversion system, all I find is a unit that can handle a 3 or 5 speed hub. I think these are the internal geared hubs and not modern derailers.
If anyone knows of a manufacturer who has a conversion kit for a bike with a high number of gears, I would appreciate hearing about it.