Compare the2025 BMW X4VS 2024 Mercedes GLB

The BMW X4 has standard driver and front passenger side knee airbags mounted low on the dashboard. These airbags helps prevent the driver and front passenger from sliding under their seatbelts or the main frontal airbags; this keeps them better positioned during a collision for maximum protection. Knee airbags also help keep the legs from striking the dashboard, preventing knee and leg injuries in the case of a serious frontal collision. The GLB doesn’t offer a front passenger side knee airbag.

The X4 has standard Active Head Restraints, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the Active Head Restraints system moves the headrests forward to prevent neck and spine injuries. The GLB doesn’t offer a whiplash protection system.

The X4 has a standard PostCrash iBrake, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The GLB doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.

Over 200 people are killed each year when backed over by motor vehicles. The X4 offers an optional Active Park Distance Control that uses rear sensors to monitor for objects to the rear and automatically applies the brakes to prevent a collision. The GLB doesn’t offer automatic braking for stationary objects directly to the rear.

To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the X4. But it costs extra on the GLB.

The X4’s standard lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane and gently nudges the vehicle back towards its lane. A lane departure warning system costs extra on the GLB.

Both the X4 and the GLB have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, blind spot warning systems, rearview cameras, rear cross-path warning, driver alert monitors and available around view monitors.

The X4’s corrosion warranty is 7 years longer than the GLB’s (12 vs. 5 years).

BMW pays for scheduled maintenance on the X4 for 3 years and 36,000 miles. BMW will pay for oil changes, tire rotations, air filter replacements, cabin filter replacement, brake fluid replacement, inspections, and any other required maintenance. Mercedes doesn’t pay scheduled maintenance for the GLB.

A reliable vehicle saves its owner time, money and trouble. Nobody wants to be stranded or have to be without a vehicle while it’s being repaired. Consumer Reports rates the X4’s reliability 27 points higher than the GLB.

J.D. Power and Associates rated the X4 first among compact premium suvs in their 2024 Initial Quality Study. The GLB isn’t in the top three in its category.

J.D. Power and Associates’ 2024 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that BMW vehicles are more reliable than Mercedes With 28 fewer problems per 100 vehicles in the first three years of ownership, J.D. Power ranks BMW higher than Mercedes.

From surveys of all its subscribers, Consumer Reports’ January 2024 Auto Issue reports that BMW vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks BMW 20 places higher in reliability than Mercedes.

The X4 xDrive30i’s standard 2.0 turbo 4-cylinder produces 27 more horsepower (248 vs. 221) than the GLB’s 2.0 turbo 4-cylinder hybrid. The X4 M40i’s standard 3.0 turbo 6-cylinder hybrid produces 161 more horsepower (382 vs. 221) and 111 lbs.-ft. more torque (369 vs. 258) than the GLB’s 2.0 turbo 4-cylinder hybrid.

The X4 has 3.7 gallons more fuel capacity than the GLB (17.2 vs. 13.5 gallons), for longer range between fill-ups.

For better stopping power the X4 M40i’s brake rotors are larger than those on the GLB:

The X4’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs on the GLB are solid, not vented.

The X4 stops much shorter than the GLB:

For better traction, the X4 has larger standard tires than the GLB (245/50R19 vs. 235/55R18). The X4’s optional tires are larger than the largest tires available on the GLB (F:245/45R20 & R:275/40R20 vs. 235/55R18).

The X4’s standard tires provide better handling because they have a lower 50 series profile (height to width ratio) that provides a stiffer sidewall than the GLB’s standard 55 series tires. The X4’s optional 245/40R21 front and 275/35R21 rear tires have a lower 40 series front and 35 series rear profile than the GLB’s optional 45 series tires.

For better ride, handling and brake cooling the X4 has standard 19-inch wheels. Smaller 18-inch wheels are standard on the GLB. The X4’s optional 21-inch wheels are larger than the 20-inch wheels optional on the GLB.

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the X4 can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. Run-flat tires aren’t available on some tire packages on the GLB.

The X4 offers an optional space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the GLB; it requires you to depend on its run-flat tires, which limits mileage and speed before they are repaired. If a run-flat is damaged beyond repair by a road hazard your vehicle will have to be towed. Some tire options on the GLB don’t have a run-flat feature, either.

For a smoother ride and more stable handling, the X4’s wheelbase is 1.4 inches longer than on the GLB (112.8 inches vs. 111.4 inches).

For better handling and stability, the average track (width between the wheels) on the X4 is .3 inches wider in the front and 2 inches wider in the rear than the track on the GLB.

The X4’s front to rear weight distribution is more even (49.2% to 50.8%) than the GLB’s (57% to 43%). This gives the X4 more stable handling and braking.

The X4 M40i handles at .89 G’s, while the GLB 250 4MATIC pulls only .83 G’s of cornering force in a Motor Trend skidpad test.

The X4 M40i executes Motor Trend’s “Figure Eight” maneuver 1.8 seconds quicker than the GLB 250 4MATIC (25.6 seconds @ .73 average G’s vs. 27.4 seconds @ .62 average G’s).

For greater off-road capability the X4 has a greater minimum ground clearance than the GLB (8 vs. 7.9 inches), allowing the X4 to travel over rougher terrain without being stopped or damaged.

The front grille of the X4 uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The GLB doesn’t offer active grille shutters.

The X4 has 1.6 inches more front shoulder room and 1.1 inches more rear shoulder room than the GLB.

The X4 has a much larger cargo volume than the GLB with its rear seat up (18.5 vs. 5.1 cubic feet).

Pulling a handle automatically lowers the X4’s rear seats, to make changing between passengers and cargo easier. The GLB doesn’t offer automatic folding seats.

The engine in the X4 is mounted longitudinally (North-South), instead of sideways, as in the GLB. This makes it easier to service and maintain, because the accessory belts are in front.

Heated windshield washer nozzles are standard on the X4 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. Heated windshield washer nozzles cost extra on the GLB.

Both the X4 and the GLB have standard heated front seats. The X4 also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated second row seats aren’t available in the GLB.

Optional air-conditioned seats in the X4 keep the driver and front passenger comfortable and take the sting out of hot seats in Summer. The GLB doesn’t offer air-conditioned seats.

J.D. Power and Associates rated the X4 first among compact premium suvs in owner reported satisfaction. This includes how well the vehicle performs and satisfies its owner’s expectations. The GLB isn’t in the top three.