How many mph does a 21 speed bike go?
Like others said, it’s how hard you peddle. I installed a speedometer on my bike (21 speed and 16, yes 16, years old) and went on a bike lane where I knew I would always hit around my fastest speed. It is slightly downhill, so not a very accurate figure, but I hit 28 mph, and could likely get to 30+ on a really good day. After that ride my average speed was found to be 13.3, but I wasn’t trying to go very fast most of the time. So, anyway, so far I’ve seen that 18 mph is the best speed I can maintain for a long distance, but of course that depends on your fitness, and the quality of the bike. Maximum speed usually seems to peak at 21-25.
