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@Butters
According to the app on my phone:
48 / 16 = 79.1 GI
48 / 17 = 74.5 GI (the gear I ride at the mo)
48 / 19 = 66.6 GI (the gear DJ likes)
39 / 13 = 79.1 GI
38 / 13 = 77.1 GI
37 / 13 = 75.1 GI
36 / 13 = 73 GI
34 / 13 = 69 GI
32 / 13 = 64.9 GI
30 / 13 = 60.9 GI
Higher GI = tougher to pedal. Take your pick.