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There are two limiting factors. The first is the PCD of the chainring bolt holes, which will define the minimum chainring size. 39t is the smallest (realistically) you can go with a 130mm PCD (standard), 34t for 110mm (compact). The second is the difference between the two chainrings in the number of teeth. This depends as much on derailleur design and geometry as anything, but a 16t maximum difference is a reasonable starting point.
Brommers
Hi everyone,
N00b question on road doubles. So common chainring combos are 53/39, 52/38, 50/34 and 'cyclocross' 46/36. Some manufacturers would also use 48/34 (came stock on my AWOL for example). Here's the question - what defines which combo can or cannot be used? I'm thinking of using double with 34/32 inner and would like to understand if 46/44/42 can be used as an outer?
Thanks