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With just one gear, there's no need to worry about shifting up and down gears to match the gradient, and you can put all the focus into simply pedalling

Its a solid, proven workhorse for riders who want group functionality without the complexity or cost of high-end units

SUPPLIES YOULL NEED: cardboard eggs (3 per team) egg cartons rubber bands tape bubble wrap cotton balls sponges marshmallows pom poms cotton balls pipe cleaners rulers (1 per team) Step 4: Design and Build Let students create with little input from you

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The hill we use for all tests is a local steep known as Hell Hole, a 0.30 mile climb with grades of up to 12 percent