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Belt Tracking

Pulley Crowns

Crowning one or several pulleys in a belt system is the most common way of tracking a belt.  For flat power transmission belts and narrow conveyor belts (up_to_8_in.), a radius crown is used.  For wider conveyor belts, a trapezoidal crown is typically applied.  Note: Never utilize an apex crown!

Radius Crown Specifications for Flat Belt Pulleys

A radius crown represents a great way to track a belt.  Dimensionally, it does not take a big crown height in order for the belt to track properly, and exceeding the seemingly small amounts below will actually do more harm than good!

In a system with multiple pulleys, crown the pulleys that turn the same way.


Standard Radius Crown Heights  h
Pulley Face
Width Wp
Pulley Diameter  D
1-6 6-12 12-28 28-40 40-60 >60
in in in in in in in
1-5 0.031 0.047 0.051 0.067 0.078 0.098
5-10 0.039 0.051 0.059 0.078 0.090 0.110
10-16 0.043 0.055 0.063 0.087 0.098 0.118
>16 0.047 0.059 0.078 0.098 0.118 0.137

convert to metric units

The min. pulley face width Wp = (belt width Wb x 1.1) + 0.5 in.

The max. belt width Wb = (pulley face width Wp - 0.5 in) / 1.10

Trapezoidal Crown Specifications for Conveyor Pulleys

Pulley Diameter  D Crown Height  h
in in
1 to 2.75 0.012
2.75 to 4 0.017
4 to 6 0.022
6 to 8 0.026
8 to 11 0.034
11 to 14 0.042
>14 0.045

convert to metric units


Note: The cylindrical part of the pulley Wc is half of the belt width Wb
Also, it is recommended for the pulley width Wp to be approximately 10 to 20% wider than the belt width Wb for the pulley crown to function properly.  For pulley widths less than 8 in., use a radius crown and refer to the flat belt pulley specifications above.


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