Panthera U3 has a tapered front and a steeper footrest angle that gives a more upright and active drivning position compared to S3.

| Model code | G551 | G551 | G551 | G551 | G551 | |||
| A | Seat width cm | 33 | 36 | 39 | 42 | 45 | ||
| B | Total width | 54 | 57 | 60 | 63 | 66 | ||
| C | Total length cm | 84 | 84 | 84 | 84 | 84 | ||
| D | Total height cm | 64-84 | 64-84 | 64-84 | 64-84 | 64-84 | ||
| E | Seat angle degrees | 7° | 7° | 7° | 7° | 7° | ||
| F | Seat height rear cm | 43 | 43 | 43 | 43 | 43 | ||
| G | Seat height front cm | 47 | 47 | 47 | 47 | 47 | ||
| H | Seat depth cm | 35-46 | 35-46 | 35-46 | 35-46 | 35-46 | ||
| I | Backrest angle back - forwards | 17,3°- (-5°) | 17,3°- (-5°) | 17,3°- (-5°) | 17,3°- (-5°) | 17,3°- (-5°) | ||
| J | Backrest height cm | 20 - 45 | 20 - 45 | 20 - 45 | 20 - 45 | 20 - 45 | ||
| K | Footrest height in cm for the footrest positions | |||||||
| Footrest standard | 36,38,40,42,44 | 36,38,40,42,44 | 36,38,40,42,44 | 36,38,40,42,44 | 36,38,40,42,44 | |||
| Footrest extended | 38,40,42,44,46 | 38,40,42,44,46 | 38,40,42,44,46 | 38,40,42,44,46 | 38,40,42,44,46 | |||
| L | Footrest angle degrees | 100° | 100° | 100° | 100° | 100° | ||
| M | Width cm | 41 | 44 | 47 | 50 | 53 | ||
| N | Length cm | 78 | 78 | 78 | 78 | 78 | ||
| O | Height cm | 45 | 45 | 45 | 45 | 45 | ||
| Weight | ||||||||
| Total (g) | 8043 | 8180 | 8131 | 8219 | 8527 | |||
| Transport (g) | 4483 | 4571 | 4659 | 4747 | 4967 | |||
| User weight (kg) | 100 | 100 | 100 | 100 | 150 | |||
| STANDARD DESIGN | Art.no. for configuration, not possible to order separately | |||||||
| Chassis | Chrome molybdenum | Width 33 | 5513300BLG | |||||
| Rear axle | Carbon | Width 36 | 5513600BLG | |||||
| Balancing | Ungraded adjustable | Width 39 | 5513900BLG | |||||
| Rear wheels | 24" | Width 42 | 5514200BLG | |||||
| Push rim | Titanium | Width 45 | 5514500BLG | |||||
| Brakes | High brake S3 | |||||||
| Castors | 90 mm | |||||||
| Foot rest | Titanium | |||||||
| Back rest | Ungraded adjustable angle | |||||||
| Back rest upholstery | Adjustable | |||||||
| Others | Calf band, Tool kit, Manual | |||||||