years back Sun Tour made a 3 pulley RD, I suppose to try to make a shorter cage
wrap chain slack up like a longer one..
Were it to work, seems it practical, using on small rear wheels
where the bottom pulley gets within inches of the Road surface,
as is on Bike Fridays and some Tadpole Tricycles with Dual Drive Sram Hubs..
and 34 t Low gear cog cassettes, + a triple crank..
But there are none made like that, any more..
Big wheel MTB stuff just gets adopted ..
Last edited by fietsbob; 12-16-10 at 04:10 PM.