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Curious,There is nothing unique about a chain driven transmission, quite common..I must be missing something.Ha!:-)
Possibly the only multi speed transmission that can be rebuilt on the side of the road. Back in the eighties I had a chance to buy one of those in good rideable condition for 600 dollars and I didn't have enough money to do so.
Many years back I was on a Guzzi tour in Switzerland and met up with another local moto club. This was on the bench.Patrick HayesFremont CA
I think the advantage was that the chain is more tolerant to any misalignment, which might happen with fast high volume production on pre war bikes (and until Zündapp made them...).Overall, it's probably as reliable as a common transmission. Lots of bikes have chain primary drive. Zündapp just (kind of) had 4.
On a two shaft geared transmission the input and output shafts rotate in opposite directions. On a two shaft chain drive setup both shafts rotate in the same direction. So I guess all you need to do to make a two shaft transmission with reverse would be to set up all but one speed selection with chains, or all but one speed selection with gears. The oddball would be the reverse.