The XM has active sway bars, which help keep it flat and controlled during cornering, but disconnect at lower speeds to smooth the ride and offer greater off-road suspension articulation. This helps keep the tires glued to the road on-road and off. The EX90 doesn’t offer an active sway bar system.
The rear suspension of the XM uses air springs for a smoother, controlled ride than the EX90, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.
The XM offers an available adjustable active suspension system, which counteracts cornering forces actively, limiting body roll and improving handling and stability. Volvo doesn’t offer an active suspension on the EX90.
For a smoother ride and more stable handling, the XM’s wheelbase is 4.7 inches longer than on the EX90 (122.2 inches vs. 117.5 inches).
For better handling and stability, the track (width between the wheels) on the XM is 2.2 inches wider in the front and .9 inches wider in the rear than on the EX90.
The XM Label handles at .97 G’s, while the EX90 Ultra Twin Motor Performance pulls only .88 G’s of cornering force in a Motor Trend skidpad test.
The XM Label executes Motor Trend’s “Figure Eight” maneuver 2 seconds quicker than the EX90 Ultra Twin Motor Performance (23.9 seconds @ .84 average G’s vs. 25.9 seconds @ .75 average G’s).
For greater off-road capability the XM has a greater minimum ground clearance than the EX90 (8.7 vs. 8.4 inches), allowing the XM to travel over rougher terrain without being stopped or damaged. The XM’s minimum ground clearance is .2 inch higher than on the EX90 (8.7 vs. 8.5 inches).