That guy seems really nice I ' m glad he ' s being kind to the skate kids that idolize him . <| sep |> If these aren ' t your own chickens , it presumably came in a packet with nutritional information . If it didn ' t , the thing you have learnt today is to check your food has that info before you buy it . <| sep |> Either one . The circumference is what really matters , but the area of a circle will increase or decrease ~~ linearly ~~ with the circumference . What you ' re really concerned with is the ratio of the chainring to the smallest cog on your cassette . If your chainring has 40 teeth and your smallest cog has 10 teeth , that means that you have a 4010 simplified as 41 gear ratio . Practically this means that every time you turn your cranks which pulls 40 teeth worth of chain , you ' re going to turn the rear wheel 4 times 40 teeth worth of chain divided by 10 teeth 4 turnsEDIT That ' s a right triangle you idiot !