Originally Posted by Rich B.
When I decide to make the switch, is there any way to change the chainrings on my shimano 105 crank to 24/36/48, or am I looking at a complete change to a mountain crank which will mean a different derailer, chain, cassette,rear derailer,ect.? I currently have the Shimano LX HG70 11-32 cassette. Would this be compatible with a mountain crank?
24/36/48 rings require a smaller crank spider (110 BCD) than your 105's 130 BCD spider.....in other words, buying a whole new crankset to make this change. No need to change anything else though, including bottom bracket, assuming it is square taper....