1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Gear ratios

  1. Feb 24, 2015 #1
    I'm confused as to how gear ratios work in bicycles. I'm given a problem which says that gear ratio = rfront/rear. It then says that the gear ratio changes from 4 to 0.7. Does this mean that the radii of the gears are changing? I'm unfamiliar with gears on a bicycle so I'm not sure if the radius of the gear can change,
     
  2. jcsd
  3. Feb 24, 2015 #2

    Svein

    User Avatar
    Science Advisor

    images?q=tbn:ANd9GcTihNh9C5plUKlxcOgm-hU0PTWT4QxV1HllZcBjWJcJ-Oqu3eD1.jpg
    Here is a picture of a bicycle gearing system. The rear wheel has a "rosetta" of 7 cog wheels with different diameters. The pedal setup has just two wheels with different diameters. The gear ratio is then (selected diameter at the pedal setup)/(selected diameter on the rear wheel rosetta).
     
  4. Feb 24, 2015 #3

    CWatters

    User Avatar
    Science Advisor
    Homework Helper

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Gear ratios
  1. Bicycle gear ratios (Replies: 17)

  2. Bike gear ratio (Replies: 2)

Loading...