Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

I need to turn a 24" flywheel at 500 RPM with a bicycle

  1. May 4, 2015 #1
    I am trying to figure out the gear ratio's needed to turn a 24", 100 lb flywheel at 500 RM with a bicycle. I can not find a formula to calculate the size gears I will need. Can anyone point me in the right direction?
  2. jcsd
  3. May 5, 2015 #2


    User Avatar

    Staff: Mentor

    Welcome to Pf! Do you know the formula for gear ratio? Is this homework? An actual design project? Where have you looked/what have you tried?
    Last edited: May 5, 2015
  4. May 5, 2015 #3

    jack action

    User Avatar
    Science Advisor
    Gold Member

    Pretty simple. What is your pedaling rate? Say it is 70 rpm. Then the gear ratio needed is 70 / 500 or 0.14:1. It is a pretty large gear ratio, you might be interested in doing compound gear ratios.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook