Toothed Belt vs V Belt

1. Hp/kw of motor
2. Rpm of motor
3. Rpm of driven device
4. Centerline distance of pulleys
5. Dimensions of belt guard, if new drive must fit into the same space.
6. Shock loading factor, or type of machinery being driven.

thanks alot

now. i want to knowe the calculations to choose suitable pully and belts

Quite often the website of the belt, sheaves (pulleys) manufacturer have an engineering section to help people correctly size the drive components.

Check with your supplier to get the web address if you have trouble finding it on your own.