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@Velocio
Renewed love for 47x17.
Two prime numbers, skid patches galore, a perfectly speedy yet pleasant cruising ratio.
And @jimmyflysuppah London is flat. There's a couple of small steep hills South East (around Black Heath), North (around Hampstead Heath) and that's about it.
The lower gears are just because traffic is a mess, pedestrians are a hazard on the road, and emergency braking is needed too frequently even if you're paying attention. Somewhere between 69" and 79" is what most people ride in London, with a slight bias toward the lower end of that range.