42/17 is enough for 20km/h surely
42x17 equals 28kph at 90rpm and 31kph at 100rpm, seems perfect for touring (if not a tad fast even perhaps).
http://www.bikecalc.com/speed_at_cadence
I at least can't push 90rpm over a long time. Something between 60 and 70 is more realistic
I at least can't push 90rpm over a long time
Of course you can't, when you're running 50x15.
Something between 60 and 70 is more realistic
This
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42x17 equals 28kph at 90rpm and 31kph at 100rpm, seems perfect for touring (if not a tad fast even perhaps).
http://www.bikecalc.com/speed_at_cadence