When the damper inside a MacPherson strut wears out, you can buy a replacement cartridge which — depending on type — may or may not include new parts for the strut itself.
Event: SAE 2005 World Congress & Exhibition Also in: Advanced Hybrid Vehicle Powertrains 2005-SP-1973 Military vehicles and equipment Test facilities Test procedures Simulation and modeling Wheels

Big wheels and low profile tires make any vehicle look tough. For years, the aftermarket has provided wheels in the most gargantuan sizes possible, wrapping them in tires with sidewalls as thin as an o-ring. As beltlines rise, greenhouses shrink, and wheel arches become more pronounced, manufacturers are routinely shoeing their cars — even relatively sedate family sedans — with wheels 19 and even 20 inches in diameter. They look great, but their durability and expense is questionable, at best. Not long ago — well into the 2000s — most daily driver sedans came with something along the lines of a 205/60R15 tire (See this diagram to explain the numbers). Tires in these sizes typically offer a good compromise between road-holding and ride, providing a nice, fat contact patch with the road, yet allowing some flexibility in the sidewall to soak up pavement irregularities.
Like a regular pneumatic tire, the ASW is air-suspended, but in this case, it's not by an inflated tube. It's a full hub and wheel replacement that separates the outer tread and rim from the hub using a set of eccentrically mounted, pneumatic air cylinders.