Calculation of the radius of the pulley crowns:
| Pulley diameter | Height of crown h |
| mm | mm |
| up to 112 | 0.3 |
| from 112 to 140 | 0.4 |
| from 140 to 180 | 0.5 |
| from 180 to 224 | 0.6 |
| from 224 to 355 | 0.8 |
| from 355 to 500 | 1 |
| from 500 to 1000 | 1.2 |
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