rozett
Platinum Member
- Joined
- Mar 23, 2002
- Messages
- 718
- Location
- Maine
- Tractor
- Cub Cadet 7360SS & Craftsman GT3000 23 HP w/50
Bird, you can approximate the volume of a donut (tire) with the following formula. Basically, the area of the tire circle minus the area of the rim circle times the width.
It is not precise because you would need to know the exact tire profile when inflated. Unlike donuts, tires are not perfectly cylindrical. Sports tires tend to be squatter, while truck tires tend to be more tall. So using the tread width is a good approximation. 3.14159 is obviously pi.
(tread width) * 3.14159 * [(tire radius)squared - (rim radius)squared]
ps: my dad would be proud that all of that aeronautical engineering education actually stuck. /w3tcompact/icons/grin.gif
It is not precise because you would need to know the exact tire profile when inflated. Unlike donuts, tires are not perfectly cylindrical. Sports tires tend to be squatter, while truck tires tend to be more tall. So using the tread width is a good approximation. 3.14159 is obviously pi.
(tread width) * 3.14159 * [(tire radius)squared - (rim radius)squared]
ps: my dad would be proud that all of that aeronautical engineering education actually stuck. /w3tcompact/icons/grin.gif