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As per title really. My Granny ring on my touring bike is 30t and a smaller ring would be nice. Would a 24/26t shift OK up to the 39 middle?
Mechs have a max-capacity, e.g. this one [url= http://www.chainreactioncycles.com/shimano-105-5703-triple-10sp-front-mech/rp-prod50492?gs=1&gclid=CLW24p292coCFUKeGwodLZMHyg&gclsrc=aw.ds ]105 tripple mech[/url] is 20t so to an extent it depends on what the big ring is (and the mech), 24-44 is Ok, 24-50 won't work (the chain will clatter along the the bottom of the mech in the granny).
14 - 24/38 or 26/40 are typical it's not that more won't work but will get harder to shift.
My 105 triple front mech works fine with 26/39/50 and 105 STIs. (Crank was originally a 105 30/39/50)
I haven't tried going to a 24T granny, so I don't know about that.
What i want to know if 26/39/46 would work (I suspect it won't without changing other bits)
I seem to remember it being 14
Thought I'd give a update on this. I bit the bulit & the postman brought me a 24t chainring from spa cycles. Turns out 24/39/53 shifts nicely with A huuuge range of gears.
Now I have a nice low climbing gear for loaded touring and I avoid cycling away from my girlfriend and as the roads ramp up neutralising any potential issues! Happy days!