bicycle gear ratios

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1 total messages Started by Felix Grant Thu, 21 Jan 1993 18:59

#510

Author: Felix Grant
Date: Thu, 21 Jan 1993 18:59

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Quoting:
  Fri 15 Jan 93  7:29
     By: William I Johnston
     To: All

 > Does anyone know how many teeth are on each of the gears
 > (front and rear) of a typical ten-speed bicycle?

I don't know about the US, but in the UK there *is no* "typical" number in that sense.  The balance between chainwheel and sprockets varies, for the same ratios - even between different examples of the same model.  Suggest asking a bicycle store for approximate values.

 > What kinds of questions would you ask high school students
 > about this to teach ratio concepts?

I would be inclined to ask the students to count the teeth on a real bicycle, then use the reulting data ... much more experiential involvement, wider skills development, better education.  Also ask them to find out what ratios are appropriate for particular applications that interest them (a particular road race, or a cyclocross over Mt Hood, perhaps?) then draw up practical ways in which these ratios might be made up from stocks actually available at their local cycle shop.

Felix


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