I ran this Dahon Hammerhead as a 1x9 (came as 1x8 from the factory)- switched out the rear mech to a 105 short cage after the pic was taken, never had any problems, using stock shimano 9 speed chain.
If the Chainring is lined up with the center of the cassette, then you shouldn't have any problems - the chain stretch on a double or triple set up is not an issue as the chain doesnt have to move anything like as far on a single chainring that is set up correctly
I ran this Dahon Hammerhead as a 1x9 (came as 1x8 from the factory)- switched out the rear mech to a 105 short cage after the pic was taken, never had any problems, using stock shimano 9 speed chain.
If the Chainring is lined up with the center of the cassette, then you shouldn't have any problems - the chain stretch on a double or triple set up is not an issue as the chain doesnt have to move anything like as far on a single chainring that is set up correctly