The current Opel Signum is 4,636 mm long, 1,798 mm wide and 1,466 mm tall, on a 2,830 mm wheelbase.
Only one generation of this model is in our catalogue, so there is no size history to compare yet.
The Opel Signum offers 930 mm of rear legroom and 940 mm of rear headroom, with 1,130 mm of legroom and 1,025 mm of headroom up front. Rear shoulder room measures 1,480 mm across.
| Front | Rear | |
|---|---|---|
| Legroom | 1,130 mm | 930 mm |
| Headroom | 1,025 mm | 940 mm |
| Shoulder room | 1,490 mm | 1,480 mm |
Interior figures are the roomiest measurement (seat fully back), taken as the median across the current generation’s variants; individual trims vary.
Exterior figures are manufacturer specifications for the Signum, averaged per generation across its variants and shown for the most common body style. Generations with the same size are merged. Boot capacity is the seats-up figure where the manufacturer quotes one.