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jeff80
48x18 or 48x19, prob 48x19. When it's flat, which there isn't much of, we won't be smashing it so will get you up and then you'll spin down without wanting to bounce around too much.
Stick the 19 on and go for a quick hilly ride and see how you feel, eg the below and see how you feel. This is fairly bumpy but not terrible so the hills would be a good test to see what you can winch yourself up (or local hills). Somewhere between 66-72gi is what you're looking for https://ridewithgps.com/routes/26960350