Frame/Drivetrain
| Anaheim Extrusion Company | Contains general facts on aluminum extrusion, as well as information on how it's made and why it's an effective building material. |
| Introductory Gears -Howstuffworks.com |
A very good introduction to the mechanical principles of the gear. It includes information on gear ratios, as well as the uses, advantages, and disadvantages of various types of gears, such as spur, bevel, and worm gears. |
