What is the difference between 3st and 4st?

[VonJake]

The differences between 3st and 4st lie in drainage performance, rubber compound, safety, and anti-aging properties. Michelin 3st is a comfort-oriented tread pattern, with the full name Primacy 3ST (Hao Yue). Michelin 4st, with the full name PRIMACY 4 (Hao Yue 4), is an upgraded version of the comfort-oriented tread pattern tire. Drainage performance difference: 4st features a new tread design through Evergrip technology, increasing drainage space by over 50% compared to 3st, providing excellent drainage and reducing hydroplaning. Rubber compound difference: Compared to 3st, 4st adopts a new tread design and rubber compound, enhancing wet braking performance and rolling resistance for both new and worn tires. Michelin 3st is a premium comfort-oriented tread pattern, known for driving comfort and low noise. Safety difference: 4st's new rubber compound offers superior braking performance, enhancing driving safety. PRIMACY 4 is ideal for safety-conscious drivers who enjoy quiet rides, providing consistent safety from new to worn. Anti-aging properties: Michelin 4st's new compound gives it stronger anti-aging capabilities. Even with significant wear, 4st maintains excellent performance, greatly improving driving safety. For daily tire maintenance: Regularly inspect tires for cracks or deformations. Worn treads lose drainage and anti-slip functions, compromising performance. Small cracks can lead to blowouts at high speeds. Remove stones from grooves promptly. Park on level ground. Avoid parking on surfaces with sharp stones or near substances that degrade rubber. Don't turn the steering wheel after parking to prevent accelerated wear. Don't cool overheated tires with water. In hot weather or after high-speed driving, let tires cool naturally without deflating or splashing water to prevent abnormal aging. Avoid sudden braking. Minimize frequent or hard braking to reduce tread wear from dragging.

[AllisonDella]

When it comes to the differences between the 3 Series and 4 Series, I'd say it mainly boils down to style and practicality. The 3 Series is like my daily commuter – a standard sedan with spacious interiors where three adults can sit comfortably in the back, and the trunk is roomy enough for groceries or travel. The 4 Series, on the other hand, leans more towards a sporty coupe. Its two-door design is super eye-catching, turning heads wherever you go, but the rear seats are much tighter – fine for kids but a bit cramped for adults. Performance-wise, they're similar, but the 4 Series has stiffer suspension, better cornering stability, and more exhilarating handling. Price-wise, the 4 Series usually costs more due to its premium positioning. If you prioritize practicality and value for money, the 3 Series is the smarter choice. But if you're after style and driving thrills, the 4 Series definitely steals the spotlight. Also worth noting: the 4 Series Gran Coupe version features a sleek fastback design that offers slightly more space, though overall it still can't match the 3 Series in terms of straightforward utility.

[LilyDella]

From a daily life perspective, I chose the 3 Series because it's more family-friendly. As a sedan, the 3 Series offers comfortable rear seats that easily accommodate child seats, and its trunk can handle large luggage, making weekend family trips stress-free. The 4 Series is different—it leans more toward personal driving. Its sleek coupe design looks cool, but practicality takes a hit: rear-seat access is tricky, storage space is limited, and the trunk opening is narrow, making it a hassle to fit a large suitcase. In terms of driving feel, the 4 Series is indeed sportier, with a low-slung body that stays stable in corners, but for daily commutes on bumpy roads, the 3 Series' comfortable suspension is more passenger-friendly. Price-wise, the 4 Series has a higher starting cost and potentially slightly higher fuel consumption. Overall, if you prioritize practicality and safety, the 3 Series is a solid choice; if you want personality and driving excitement, the 4 Series is worth a try—but you’ll have to sacrifice some space.

[DelHector]

I've driven quite a few BMWs, and the driving experience between the 3 Series and 4 Series is quite distinct. The 3 Series, as a classic sedan, offers balanced handling with suspension tuned for comfort, effectively absorbing road imperfections for fatigue-free long-distance driving. The 4 Series, while sharing the same platform, is positioned as more sporty with a lower stance, precise steering, and superior grip during high-speed cornering, making it particularly enjoyable for mountain road driving. Though their power specs are similar, the 4 Series responds more directly with a fiercer acceleration feel. Space-wise, the 3 Series boasts significantly more rear legroom and trunk capacity, while the 4 Series' coupe design sacrifices practicality. Configuration differences also exist—the 4 Series often offers more sport package options like adaptive suspension. For me, the 3 Series is a practical daily companion, whereas the 4 Series is a thrilling toy—your choice depends on how you prioritize driving enjoyment.

[DiTimothy]

In terms of price and value, I've researched both BMW series. The 3 Series is generally more affordable, with a lower starting price, stable resale value, and relatively manageable maintenance costs, making it suitable for budget-conscious buyers who still want to experience a luxury brand. The 4 Series, on the other hand, comes with a higher price tag, positioned as more luxurious and sporty, often featuring customizable options like carbon fiber trims, which add appeal but also increase ownership costs. In terms of space and practicality, the 3 Series offers a more spacious rear seat, making it better suited for families, while the 4 Series has a cramped rear, lacking in practicality. Both share similar powertrains, but the 4 Series emphasizes more on driving excitement and handling. If you prioritize cost-effectiveness and daily usability, the 3 Series is the smarter choice. Opting for the 4 Series for its uniqueness will bring distinctive satisfaction, but don’t expect a bargain.

[StJameson]

From a historical and brand perspective, let me discuss the evolution of the BMW 3 Series and 4 Series. The 3 Series has always been the cornerstone of BMW, passed down since the 1970s, focusing on a practical sedan approach—stable and dignified, deeply loved by family users. The 4 Series came much later, originating in the 2010s, initially as a Coupe variant of the 3 Series before becoming an independent series dedicated to the sports coupe and Gran Coupe segments, targeting a younger and more individualistic audience. Design-wise, the 4 Series features a wider and lower body, with its iconic kidney grille being bolder, enhancing visual impact. While it falls short of the 3 Series in space and practicality, its driving dynamics are more radical. Price-wise, the 4 Series is slightly higher. For me, the 3 Series is a reliable veteran, while the 4 Series is a fashionable new favorite—choosing between them depends on whether you prefer tradition or innovation.