2017 Porsche 911 Cabriolet (991 II) Dimensions, Size & Specs

The Porsche 911 Cabriolet (991 II) has a curb weight ranging from 1500 kg to 1670 kg (approximately 3307 to 3683 pounds), depending on specific models and options. The maximum permissible weight falls between 1925 kg and 2065 kg (about 4244 to 4553 pounds). This relatively lightweight design, considering its performance capabilities, contributes to its agile handling and dynamic performance on the road. Lower weight generally improves acceleration, braking, and cornering, characteristics that the 911 Cabriolet is renowned for, especially with its rear-engine layout and refined suspension tuning.

The Porsche 911 Cabriolet (991 II) offers a luggage capacity between 115 and 145 liters (approximately 4.1 to 5.1 cubic feet) with the rear seats in their standard upright position. When the rear seats are folded, storage capacity increases significantly, ranging from 160 to 285 liters (about 5.7 to 10.1 cubic feet). While this is modest compared to typical sedans or SUVs, it is respectable for a high-performance sports convertible where storage space is often a trade-off for design and drivability. This expandable luggage volume grants practicality for weekend trips or everyday use, outperforming many competitor sports cars in the convertible segment.

The 911 Cabriolet (991 II) comes with various rim sizes including 8.5J x 19, 11.5J x 19, 8.5J x 20, 11.5J x 20, 9J x 20, and 12J x 20. Corresponding tire sizes include 235/40 ZR 19, 295/35 ZR 19, 245/35 ZR 20, 305/30 ZR 20, among others. Larger rims and wider tires improve grip and cornering stability, enhancing overall performance, especially during spirited driving or track use. However, bigger wheels may slightly compromise ride comfort and increase unsprung weight. Porsche carefully balances these factors to maintain the high standard of handling and comfort expected from the 911 Cabriolet.

Yes, the Porsche 911 Cabriolet (991 II) generally fits into a standard single-car garage. Its width with mirrors is 1978 mm (77.9 inches), which is just under 2 meters, so it requires a garage width that accommodates at least 2 meters plus some clearance on each side for safe entry and exit. Typical residential garages vary from about 2.4 to 3 meters in width (7.9 to 9.8 feet), so the 911 Cabriolet fits comfortably in these spaces. The height between 1291 mm and 1297 mm (50.8 to 51.1 inches) is well below standard garage ceilings, which are usually over 2 meters high, so vertical clearance is not a concern. Overall, parking this sports convertible at home should pose no issues.

Compared to the predecessor 991 I generation, the 2017 Porsche 911 Cabriolet (991 II) features subtle dimensional changes typical of a mid-cycle update. The length in the 991 II slightly increased, ranging between 4499 mm and 4528 mm (177.0 to 178.3 inches) compared to just under 4500 mm in the 991 I. Width also saw slight increments, with the 991 II reaching up to 1880 mm (74.0 inches) versus about 1800 mm previously. Height remains largely consistent around 1290 to 1297 mm (50.8 to 51.1 inches). These changes enhance stability, cabin space, and road presence without drastically altering the iconic 911 silhouette, offering drivers a refined but familiar experience.

When compared to other luxury sports convertibles in the same performance segment, such as the Audi R8 Spyder or Mercedes-AMG GT Roadster, the Porsche 911 Cabriolet (991 II) strikes a strong balance between compact dimensions and practical usability. Its length of up to 4528 mm (178.3 inches) and width with mirrors near 1978 mm (77.9 inches) make it slightly smaller than some competitors, contributing to nimble urban maneuverability. While luggage capacity is modestly sized (max 285 liters or 10.1 cubic feet with seats folded), it is competitive given its sports car focus. Overall, the 911 Cabriolet is praised for combining iconic styling, excellent driving dynamics, and reasonable daily usability, often outperforming rivals in terms of everyday convenience without sacrificing performance.

The 2017 Porsche 911 Cabriolet (991 II) is meticulously engineered to preserve the classic 911 proportions even with the convertible soft top, which adds structural requirements and weight. Designers maintained a low height between 1291 mm and 1297 mm (50.8 to 51.1 inches), preserving the sleek aerodynamic profile essential for minimizing drag and wind noise at speed. The width, ranging up to 1880 mm (74.0 inches), ensures stable handling for an open-top sports car. The use of lightweight materials keeps the curb weight between 1500 kg and 1670 kg (3307 to 3683 pounds), mitigating the performance penalty convertibles typically face. This balance results in an exhilarating open-air driving experience that doesn’t compromise the dynamic character or agility associated with the 911 lineage.

The dimensions of the 2017 Porsche 911 Cabriolet (991 II) directly affect its interior ergonomics and occupant comfort. With a relatively broad width of up to 1880 mm (74.0 inches) and a low height just under 1300 mm (51.1 inches), the cabin is optimized for two main occupants, delivering a snug but sporty seating position typical of a high-performance sports car. The convertible layout slightly reduces rear-seat usability and headroom compared to the coupe, and rear seats serve mostly as occasional storage or child seats due to limited space. The compact luggage space (115–145 liters or 4.1–5.1 cubic feet standard) supports short trips, while folding rear seats increase storage for longer excursions. Thus, the 911 Cabriolet balances driver-focused cockpit intimacy with the flexibility needed for practical driving.

The Porsche 911 Cabriolet (991 II), spanning model years 2015 to 2018, offers several refinements over the 991 I generation that enhance engineering and driving dynamics. These include updated powertrains with more efficient and higher-output engines, along with variable turbine geometry turbochargers in certain models that improve throttle response and torque delivery. The chassis was refined with improved suspension tuning and optional rear-axle steering, delivering better agility and stability, particularly on winding roads. Additionally, the interior and infotainment systems were modernized for enhanced comfort and connectivity. Structurally, reinforcements for the convertible's soft top improved rigidity without excessive weight gain. Collectively, these upgrades deliver a sportier, more comfortable, and technologically current driving experience compared to the earlier generation.