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well, I had my first really long ride today and I think I might stick with the 46/23 ratio that was on the bike when I bought it - no shame. I think it's suitable for Lisbon with all its' hills. I'll still try the 18t cog when it arrives but I feel comfortable with the one I have now. I'm not really one to go fast either so it seems fine for my use.
I might change the tires to 28mm ones though.