The Bilstein B4 22-171009 is a front right (passenger-side) suspension strut assembly for the Mini Cooper S, sold as a complete unit. It belongs to Bilstein's B4 OE Replacement line, a twin-tube gas-pressure design aimed at restoring the factory ride rather than sharpening handling. If worn struts leave your Cooper S floating over expansion joints, nose-diving under braking, or bottoming out on broken pavement, this is a like-for-like replacement for a standard-suspension car. Choose it over a bargain strut when you want a known damper brand and a predictable, non-adjustable ride.
Fitment is the first thing to verify. Listings tie this unit to standard-suspension Mini Cooper S models and exclude cars with sport suspension, and it is not the electronically adjustable DampTronic replacement used on later Cooper generations. Model-year coverage differs from one listing to the next, so confirm the application by VIN and suspension type before ordering. Buyers searching for a passenger-side Mini Cooper S front strut, a Bilstein B4 OE replacement strut, or a standard-suspension Mini front damper should check these details first.
