Wheels

• The usage of the wheel was probably delayed because some kinds of roads were needed for good usage of wheeled carriages

• On bad surface a carriage obstacled so much that is was larger to carry goods on the back
• This was a bottom line Wheels still into the 20th century in less developed areas or express hilly parts of the world.

Additional drive is lost at the wheel to road interface. This is termed rolling resistance which is predominantly a deformation loss.