How much smaller is the new BMW 3 Series 320 compared to the 5 Series?

[DelAdelyn]

After localization, the wheelbase of the new BMW 3 Series has been extended to 2961mm, only 14mm shorter than the standard wheelbase version of the BMW 5 Series. Dimensions of the new BMW 3 Series: The dimensions of the long-wheelbase version of the BMW 3 Series are 4719×1827×1459mm (length×width×height), with a wheelbase of 2961mm. As a mid-to-high-end sedan with an overall length exceeding 4.7 meters (width over 1.7 meters), it emphasizes spacious seating, luxurious interiors, and comfort. Features of the new BMW 3 Series: The all-new BMW 3 Series will be the first BMW model in China to introduce the BMW Intelligent Personal Assistant. The long-wheelbase version of the all-new BMW 3 Series boasts the longest wheelbase in its class at 2,961mm and offers China-exclusive comfort seats for both front and rear passengers. It is equipped with the latest iDrive 7.0 system, replacing the traditional handbrake with an electronic parking brake. The new 12.3-inch programmable full LCD instrument panel, 10.25-inch touch-sensitive central control display, and full-color head-up display system can operate in a three-screen linkage mode. Thanks to material optimization, the body rigidity has been increased by 25% overall, with specific areas of the passenger compartment and chassis improved by up to 50%.

[CourtneyAnn]

I've studied the size comparison between the BMW 3 Series and 5 Series, and the 3 Series is indeed significantly smaller. Take the new-generation 320 as an example: its body length is approximately 4.7 meters, while the standard wheelbase version of the 5 Series exceeds 5 meters, with the long-wheelbase version even surpassing 5.1 meters—a difference of nearly 30 centimeters. In terms of width, the 3 Series is about 1.8 meters wide, whereas the 5 Series exceeds 1.86 meters, making it 6 centimeters narrower and less imposing. The height difference is minimal, with both the 3 Series and 5 Series fluctuating between 1.4 and 1.5 meters. This directly impacts interior space—the rear seats of the 3 Series can accommodate two people comfortably, but legroom is limited, while the 5 Series offers much more spacious seating and a larger trunk capacity, making it easy to fit a suitcase. I believe this difference stems from their distinct design philosophies: the 3 Series leans more toward a sporty style, making it easier to park and navigate narrow streets, while the 5 Series emphasizes practicality and stability, better suited for daily commutes or long-distance road trips. The smaller size isn't just about numbers—it also affects the driving experience, with the 3 Series offering more agile handling and steadier cornering.

[VanAthena]

I used to commute with a 3 Series, and later I test-drove a friend's 5 Series. Immediately, I felt the space was not on the same level. The 3 Series is about 20 to 30 centimeters shorter overall—for example, it’s significantly shorter in length and visibly slimmer in appearance. It’s also a few centimeters narrower, making it a bit tighter inside, especially when seating three people in the back row. In terms of wheelbase, the 3 Series is around 10 centimeters shorter, limiting legroom and headroom, while the 5 Series excels with its sense of spaciousness. The trunk capacity also differs greatly—the 3 Series fills up quickly with just a few bags, whereas the 5 Series can fit two or three more suitcases. In practical use, the smaller size of the 3 Series makes city driving easier, with more parking options, while the 5 Series feels somewhat bulkier. If you frequently carry passengers or go on long trips, I’d recommend the 5 Series for a more comfortable experience. The size difference isn’t just about prestige—it also affects practicality. Don’t forget, the 3 Series is over 200 kilograms lighter in weight.

[ElianaDella]

As someone who drives frequently, I find the 3 Series much more compact than the 5 Series. The body is over 20 cm shorter, and the wheelbase is nearly 10 cm shorter, making it possible for rear passengers' knees to touch the front seatbacks. In terms of width, the 3 Series is a few centimeters narrower, feeling more cramped when sitting shoulder to shoulder. The height is similar, but the overall smaller dimensions affect the interior feel. This difference makes the 3 Series more agile to drive, steadier in turns, and easier to park, while the 5 Series feels more stable at high speeds. In terms of space practicality, the 3 Series has a slightly smaller trunk, sufficient for daily use, but the 5 Series is more comfortable when carrying more people.

[OHazel]

From my personal experience, the BMW 3 Series 320 is noticeably smaller in dimensions. It's nearly 30 cm shorter in length, a few centimeters narrower in width, and slightly lower in height, resulting in more cramped interior space—rear legroom is reduced by over 10 cm compared to the 5 Series, which offers a more comfortable, stretched-out feel. The trunk capacity is about 20% smaller; the 3 Series feels tight with just a bit of luggage, while the 5 Series can handle larger items more easily. The shorter wheelbase also makes the 3 Series more agile to drive, easier to navigate through narrow alleys, but the 5 Series feels more stable on long trips. I think the smaller size brings some convenience advantages, but at the cost of practicality in space. If you frequently carry family members or go on long trips, the 5 Series' dimensions are more advantageous; for simple commuting, the 3 Series is sufficient. The difference in size isn't just about numbers—it reflects the intended use, so when choosing, test the rear seats and cargo space thoroughly.

[Yvette]

When comparing the dimensions of the two cars, I noticed the 3 Series is significantly smaller. In terms of length, the 3 Series is about 25 cm shorter than the 5 Series, with a wheelbase nearly 12 cm shorter, directly reducing interior space—rear legroom is over 10 cm less. It’s also a few centimeters narrower, making it feel cramped when fully occupied. While height is similar, the overall smaller size affects both aesthetics and practicality, such as the 3 Series having over 20% less trunk capacity. The compact dimensions make the 3 Series nimble for city driving, with agile handling and easier parking, whereas the 5 Series is better suited for smooth cruising. If passenger comfort or long-distance travel is a priority, the size difference amplifies the comfort gap, with the 5 Series offering more relaxed rear seating. However, the 3 Series is more fuel-efficient and easier to maneuver.