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You might be better off mixing and matching to get a triple Crankset.
9 speed shimano allows you to mix and match road/mtb and still has a range of replacement parts that can be sourced. But I wonder if 10 speed is a bit more future proof from a parts perspective?
Fwiw I did light touring using 10 speed shimano. Whatever the biggest cassette available was + compact + medium cage RD.
Not sure I'd recommend it as a permanent set up as the gear jumps and the huge chain don't feel as tight for normal road riding. However, as you need to prep kit for touring in any event, whipping off a cassette and changing a chain isn't that much work.
hugo7-
TBH this isn't likely to be used for substantial touring as I don't think the Casseroll can really be loaded up to that degree. More likely just overnight stuff. As such I'd prefer not to be rejigging the drivetrain when switching between functions.
I agree about mix and match, since I really want something with an almost 1:1 ratio from the smallest chainring and biggest sprocket. Plus I quite fancy silver and the shimano chainsets are fugly.
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10 speed road and MTB don't play nice.
Stick to Sora unless you wanna hunt around for the pull ratios and try to get something 10 speed.
IIRC Tiagra 4603 works with 9 speed XT to allow for 11-36.
ffm
coventry_eagle
What's the ideal groupset for a do-it-all road bike? I've got a Salsa Casseroll, which is currently set up fixed, but I'm wondering whether I can rationalise my stable down to just that one bike (plus my dadbike for shopping). It would need to be able to do brisk runs out for fitness, plus some light touring, so it would need some pretty low gears for gentle ascents of steep hills.