| Number of treads | Tread width | Max. height | Min. gap | Stair diameter |
| 12 | - | 282 | 130x130 | 120 or 140 |
| 13 | - | 305,5 | 130x130 | 120 or 140 |
| 14 | - | 329 | 130x130 | 120 or 140 |
| 15 | - | 352 | 130x130 | 120 or 140 |
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