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How hard (or easy) will it become to average 25-30 km/h (15.5-18 mph) or so with a fairly heavy city bike?
Public transport takes a while to get to my work and if I can average 25 km/h I already save a signficant amount of time.
I'm +-165 lbs at 5'10, but my condition is currently horrible from sitting on my ass.