Originally Posted by
dougmc
Just to be clear, I don't think cars are generally required to have them either.
Not going to put real effort into this,but a few seconds Googling found
this:
"Mopeds are required to have two mirrors, horn, brakes on all wheels, speedometer/odometer,"
If mopeds need them,pretty sure cars need them as well. I do know they checked your speedo during inspections in PA.
Originally Posted by
turbo1889
That's an excellent question that I can answer for you. If you know your gears and your tire size you can calculate how fast you will be going in each gear by pedal cadence RPMs, a technique I personally and regularly use on
Between traffic,peds,and road conditions,I have way too many things to pay attention to than how fast I'm pedaling and what gear I'm in(esp given the pool of bikes I own). I really have zero need to know exactly how fast I'm going.