The current Daihatsu Sirion is 3,604 mm long, 1,665 mm wide and 1,550 mm tall, on a 2,430 mm wheelbase.
| Years | Length | Width | Height | Wheelbase | Boot capacity | Turning circle |
|---|---|---|---|---|---|---|
| 1998–2005 | 3,675 | 1,595 | 1,450 | 2,345 | 235 | 8.8 |
| 2005–2012Current | 3,604 | 1,665 | 1,550 | 2,430 | 225 | 9.4 |
The Daihatsu Sirion offers 880 mm of rear legroom and 920 mm of rear headroom, with 1,075 mm of legroom and 1,015 mm of headroom up front. Rear shoulder room measures 1,370 mm across.
| Front | Rear | |
|---|---|---|
| Legroom | 1,075 mm | 880 mm |
| Headroom | 1,015 mm | 920 mm |
| Shoulder room | 1,389 mm | 1,370 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 Sirion, 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.