2011 Infiniti M IV (Y51) Dimensions, Size & Specs

The curb weight of the Infiniti M IV (Y51) ranges between 1750 kg and 1916 kg (3858 lbs to 4223 lbs), while its maximum weight spans from 2271 kg to 2395 kg (5004 lbs to 5280 lbs). This weight range positions the M IV as a substantial yet nimble sedan, contributing to stability at higher speeds and comfortable ride quality. The heavier weight is indicative of robust construction and luxury features, which slightly influence acceleration but enhance ride comfort and road presence.

The Infiniti M IV (Y51) offers a luggage capacity that ranges from 320 liters to 450 liters (approximately 11.3 to 15.9 cubic feet). This variable capacity is fairly generous for a sedan in its class, making it suitable for everyday errands, grocery runs, or moderate travel needs. The volume allows comfortable accommodation of suitcases, shopping bags, or sports equipment, contributing to its practicality as a luxury family sedan.

Yes, the Infiniti M IV (Y51) typically fits comfortably in a standard residential garage. With a length of 4945 mm (194.7 inches), width up to 1845 mm (72.6 inches), and a maximum height of about 1514 mm (59.6 inches), it remains within the clearance limits of most garages. Standard garage dimensions are usually around 6 meters (19.7 feet) in length and 2.4 to 3 meters (7.9 to 9.8 feet) in width, therefore the M IV can be parked with adequate space for the driver and slight storage around the vehicle.

The ride height or ground clearance of the Infiniti M IV (Y51) ranges between 144 mm and 152 mm (5.7 to 6.0 inches). This clearance is typical of luxury sedans designed primarily for paved roads and urban driving. It provides sufficient space to handle minor road imperfections and speed bumps without scraping the underbody while maintaining a lower center of gravity for improved handling and aerodynamics. However, it may not be ideal for rough off-road conditions.

The Infiniti M IV (Y51) features rim sizes of 8.0J x 18, 9.0J x 20, and 18 inches depending on the trim and variant. Tire sizes offered include 245/50 R18 V, 245/40 R20 W, and 245/50 R18. Higher trims or sportier configurations typically use the larger 20-inch rims with lower profile tires (245/40 R20) for improved handling and aesthetic appeal, while more standard trims commonly come equipped with 18-inch rims that balance comfort and performance.

Compared to its predecessor, the Infiniti M III, the M IV (Y51) is notably larger. The M IV's length at 4945 mm (194.7 inches) exceeds that of the M III, which was approximately 4850 mm (190.9 inches), offering more interior space and a more commanding road presence. Width and height have also increased slightly, contributing to improved passenger comfort and a more luxurious feel. These dimensional enhancements align with Infiniti's move toward a more premium, executive sedan market positioning.

In the premium mid-size sedan segment, the Infiniti M IV's dimensions and capacities are competitive. For example, compared to the BMW 5 Series or Mercedes-Benz E-Class of similar years, the M IV is similar in length and width but offers comparable luggage capacity between 320 and 450 liters. While some rivals may offer slightly higher or lower figures, Infiniti’s value proposition focuses on combining luxury features with solid space and comfort, making it a strong contender on overall size and practicality.

Larger rims and low-profile tires, such as the 20-inch rims paired with 245/40 R20 tires, enhance the Infiniti M IV (Y51)'s road handling capabilities, offering more precise steering response and improved cornering stability. These options also contribute to the vehicle's sporty aesthetic appeal. However, larger rims can reduce ride comfort slightly due to thinner tire sidewalls and may increase susceptibility to road imperfections. The standard 18-inch rims and tires optimize ride smoothness and durability for everyday driving.

Yes, the Infiniti M IV (Y51) is well-suited as a family vehicle, offering spacious interior dimensions thanks to its larger length, width, and comfortable seating arrangements. Its wide body and relatively low height afford ample headroom and legroom for both front and rear passengers. The generous luggage capacity provides room for everyday bags and longer trips. Additionally, its quiet cabin, advanced features, and safety options make it a practical and comfortable choice for families who value luxury.