Bilstein B3 Rear Coil Spring 36-251261 OE Replacement for BMW 1 Series F20/F21 & 3 Series F31 xDrive (Rear Axle) Fits 120d xDrive, 320i/328i/330i/335i xDrive, M135i/M140i xDrive Standard Ride Height

Bilstein B3 36-251261 Rear Suspension Coil - OEM Grade, Stock Height - BMW F20 F21 F31 xDrive

Bring your BMW back to its best with this factory-spec rear suspension coil from Bilstein. Part number 36-251261 is the correct rear axle helical spring for xDrive versions of the BMW 1 Series F20 and F21 hatchback and the BMW 3 Series F31 Touring. It restores the original ride level, comfort and stability on models including 120d xDrive, 320i xDrive, 328i xDrive, 330i xDrive, 335i xDrive, M135i xDrive and M140i xDrive. Ideal if your original spring has snapped, is sagging or has failed an MOT, this direct-fit component returns your car to standard height without altering the chassis balance.

Why this Bilstein spring is the smart choice

• Made to genuine BMW dimensions for a straightforward rear axle install and a perfect seat in the spring perch.
• Precision wound from premium spring steel for strength, durability and excellent break resistance.
• Hot set during manufacturing to resist height loss and maintain correct corner balance over time.
• Surface compressed with a protective coating for long service life and corrosion protection.
• Quiet operation thanks to accurately formed ends that locate cleanly in the top and bottom mounts.
• Retains the original driving feel, comfort and handling that BMW intended on standard suspension cars.

We have fitted these Bilstein B3 springs on many customer cars, and the feedback is consistently positive. Owners report a level rear stance, improved composure and a return to that reassuring OEM ride quality. If your AWD F20, F21 or F31 sits unevenly, clunks over bumps or has failed an MOT for a broken rear coil, this is a proven fix that lasts.

Fitment and key data

• Location: Rear axle
• Ride height: Standard - suits non-lowered vehicles
• Manufacturer: Bilstein
• Part number: 36-251261
• Alt reference: BILSTEIN-36-251261
• EAN: 4025258763435
• UPC: 651860766737

Vehicle applications

Compatible with the following BMW all wheel drive models:

• BMW 1 Series F20 5-door and F21 3-door - 120d xDrive, M135i xDrive, M140i xDrive
• BMW 3 Series F31 Touring estate - 320i xDrive, 328i xDrive, 330i xDrive, 335i xDrive

Note: For xDrive AWD variants only. If unsure, contact us with your UK reg or last 7 of VIN for a free compatibility check before dispatch.

Perfect for these needs

• MOT failure due to a cracked or snapped rear coil
• Rear end sitting low or uneven ride height
• Clonks, knocks or poor stability from a tired spring
• Returning a modified car to stock height

Installation and advice

• We recommend changing rear springs in pairs to maintain balanced handling and equal ride level.
• Direct replacement for the original component - no trimming or modification required on standard suspension cars.

Professional fitting available

Prefer us to fit it Our workshop at MJ Modifications in Warwickshire offers expert installation and alignment. Request a quote at info@mjmodifications.co.uk.

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