Where more diameters of roller are indicated the choice will be made in relation to the lump size or material and to the severity of plant conditions.
Shows the relationship between the maximum conveyor belt speed, the conveyor roller diameter and its relative numbers of revolutions.
| Roller Diameter (mm) | Belt Speed (m/s) | RPM (n) |
| 50 | 1.5 | 573 |
| 63 | 2.0 | 606 |
| 76 | 2.5 | 628 |
| 89 | 3.0 | 644 |
| 102 | 3.5 | 655 |
| 133 | 5.0 | 718 |
| 159 | 6.0 | 720 |
| 194 | 7.0 | 689 |
The correct choice of conveyor idler roller diameter must take into account the belt width. This table indicates our recommended roller diameters for various belt widths and speeds.
| Belt Width (mm) | <2.0m/s Ø roller mm |
2-4m/s Ø roller mm |
>4m/s Ø roller mm |
| 500 | 89 | 89 | |
| 650 | 89 | 89/108 | |
| 800 | 89/108 | 89/108/133 | 133 |
| 1000 | 108/133 | 108/133 | 133/159 |
| 1200 | 108/133 | 108/133/159 | 133/159 |
| 1400 | 133/159 | 133/159 | 133/159 |
| 1600 | 133/159 | 133/159/194 | 133/159/194 |
| 1800 | 159/194 | 159/194 | ~ |
| 2000 | 159/194 | 159/194 | 159/194 |
| ≥ 2200 | 194 | 194 | 194 |
