you only need a cumputar if you have gears, right? Cos fixed gear = fixed GI (which, obviously you already know). (And the time bit is easy, note down when you leave and when you arrive). So all you have to do is work out how many pedal revolutions you have done, using this:
you only need a cumputar if you have gears, right? Cos fixed gear = fixed GI (which, obviously you already know). (And the time bit is easy, note down when you leave and when you arrive). So all you have to do is work out how many pedal revolutions you have done, using this: