| Modelo | Número de ruedas delanteras | Número de ruedas traseras |
|---|---|---|
| RSC8EX | 2 | 2 |
| RSC6EX | 2 | 2 |
| RR4EX | 4 | 2 |
| Gregory RSC7EX | 2 | 2 |
| Gregory RSC5EX | 2 | 2 |
| Gregory RSC4EX | 2 | 2 |
| Gregory RSC3EX | 2 | 2 |
| Gregory RS6EX | 4 | 2 |
| Gregory RS5EX | 4 | 2 |
| Gregory RS4EX | 2 | 4 |
| Gregory RS3EX | 4 | 2 |
| Gregory RR6EX | 4 | 2 |
| Gregory RR5EX | 4 | 2 |
| Gregory RR3EX | 4 | 2 |
| Gregory RC4EX | 2 | 2 |
| Gregory RC3EX | 2 | 2 |