Senior Member
Join Date: Aug 2010
Location: Madison, WI
Posts: 11,323
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
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How heavy of a load do you plan to carry up hills? My rando bike has a 52/42/30 crankset that works well, but that is used on a bike that carries very little weight.
My derailleur touring bikes that carry camping gear up hills, my big ring is 46 and small ring is 24.
I use those crank sizes with cassettes that range from 11 to 32 in back.
Buying individual chainrings can be hard to find and expensive. Another option is to replace the crankset, would likely need a different bottom bracket if the spindle length is wrong.