I've looked into those as well - it seems to come down to 1.) massively expensive stand-alone crankset 2.) bodge a triple 3.) get some expensive chainrings OR adapters. My LBS warned me off Roadlink/Tanpan - apparently they incur a 'fiddle with the cable tension prior to every ride' penalty..
I've looked into those as well - it seems to come down to 1.) massively expensive stand-alone crankset 2.) bodge a triple 3.) get some expensive chainrings OR adapters. My LBS warned me off Roadlink/Tanpan - apparently they incur a 'fiddle with the cable tension prior to every ride' penalty..