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 Discussion: All Topics Topic: is there one of these for real bikes? Related Item: http://mathforum.org/mathtools/tool/70643/

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 Subject: is there one of these for real bikes? Author: mightymouse Date: Jan 3 2009
I liked this one and can imagine using it with kids when we do bike training at
school.

What I want now is an applet that works for real bikes. I need to enter the
wheel size, front ring count and rear ring count and be told the 'rollout'
figure - how far a bike will travel in one rotation of the pedals.

The mathematical question is 'the ideal rollout figure for Lindsay is (enter
distance). His bike has (name of size) wheels. What combination front and rear
rings will come closest to this distance?'

An extension activity would be to use a spreadsheet to develop a table showing
rollouts for a given wheel size with different combinations of front and back
rings. Children could count the rings and measure the wheels on their own
bikes.

To be of use internationally there needs to be an option for metric units. I'm
in Australia and we went metric forty years ago. None of may students and a lot
of my colleagues have no concept of feet and inches.

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