Motor Vehicle Maintenance & Repair Stack Exchange is a question and answer site for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Could someone let me know why it is necessary to change from gear to gear ?What is the scientific foundation?

I heard " The higher your speed the higher your gear, the lower your speed the lower your gear"

share|improve this question

closed as off-topic by Gabriel Mongeon, cinelli, Nick, Rory Alsop, Move More Comments Link To Top Sep 20 '13 at 13:50

  • This question does not appear to be about motor vehicle maintenance or repair within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

This question appears to be off-topic because it is about maintenance or repair – Gabriel Mongeon Jul 23 '13 at 14:36
up vote 4 down vote accepted

Get on a mountainbike and change between gears. The same reasons apply to changing your car's gears and changing your bike's gears: you can't peddle fast than x, and you can't get away when the gears are too extreme.

The point is that humans and engines operate best at a certain cadence or RPM. If the engine spins too slowly, it can't put enough power down. If it spins too fast, components will endure too much stress, overheat and break quickly. A formula 1 car can rev up to 18000RPM, but the engine needs to be rebuilt after every race. A large truck only revs to about 2000 to 3000RPM, and while it's pretty strong, it can't go very fast.

share|improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.