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I have an older Whyte Suffolk, which has been plodding along for 5 years now on 10 Speed 105 with TRP Hy/Rd brakes.
I've just splashed out on some new Hope 20five's and critical to why I'm writing this RX4's as i'm retiring the Hy/Rds for now.
I've got some Tiagra 4700 Hyro/Mechanical STI's on the way, so brakes are sorted. But 4700 changes the pull ratio compared to 10sp 105, so I'll grab a RD-4700 GS, and theoretically we're all working on the 10 speed cassette again all good, right?
Whilst i'm doing this, i'm thinking i'll 1x10 the whole lot and put a wide range cassette on the back (hence the long cage).  What do I need to watch out for here? Is it the same as I did with my mtb?
Now days you can readily buy 11-42 10sp shimano cassette. So is it a case of me just doing that, putting a front narrow wide on, and pushing the b limit right out on the rear mech? Will the RD-4700GS have just enough to play nice with an 11-42 in single ring config? Total capacity is 41t so should be ok in theory?
Can I/Do I go bigger with an aftermarket set from OneUp etc..? Will bigger fit?