Bilstein B3 Rear Coil Spring 36-251230 - OE Replacement for BMW 1 Series F20/F21 & 4 Series F32/F82 (Rear Axle, Direct Fit; 116i 118i 120d 420i 420d 430d 435i)

Bilstein 36-251230 B3 Factory‑Spec Rear Suspension Coil for BMW F20 F21 F32 F82

Bring your BMW back to its best with the Bilstein B3 36-251230 rear suspension coil. This factory‑spec back spring restores that crisp, quiet, as‑new feel, keeping ride height and handling characteristics exactly as intended. A perfect fix for a snapped or sagging spring and a smart choice for MOT prep, this genuine‑quality Bilstein component delivers long‑term reliability and precise fitment on the rear axle.

Part number: 36-251230 | Alt ref: BILSTEIN-36-251230 | EAN: 4025258763404 | UPC: 651860766706

Why this Bilstein B3 spring is the right choice

• Factory-spec rate and arch for true stock height and comfort with confident road manners
• Direct bolt-in fit on the rear axle with OE-style pig-tail ends for a rattle‑free, precise seat
• Premium chrome‑vanadium/chrome‑silicon spring wire for outstanding strength and durability
• Hot‑set process helps resist sag over time and keeps the stance consistent
• Surface treated and coated to combat corrosion for a long service life in UK weather
• Engineered to manufacturer parameters for a noise‑free, fuss‑free drive

Real results our customers feel

We have installed these Bilstein B3 springs on multiple customer cars at MJ Modifications and the feedback is consistently positive. Owners report a return to smooth, composed ride quality, fewer knocks and creaks from the rear, and the planted BMW feel they expect. If you want stock-spec comfort and durability from a brand you can trust, this is the smart replacement spring.

Fitment and applications

Compatible with the following BMW F‑Series models on the rear axle:

• BMW 1 Series F20 2011–2019: 114i, 116i, 118i, 125i, 114d, 116d, 118d, 120d
• BMW 1 Series F21 2011–on: 116i, 118i, 114d, 116d, 120d
• BMW 4 Series Coupé F32, F82 2013–on: 420i, 420d, 430d, 435i

If you are unsure on chassis or engine compatibility, we will confirm fitment using your UK registration or last 7 of the VIN before dispatch.

Ideal use cases

• Replacing a broken rear coil to pass an MOT
• Refreshing tired suspension while keeping the original ride height
• Restoring factory levels of comfort, stability and quietness

Professional fitting

We recommend installing suspension coils in axle pairs for balanced handling. Expert fitting available at MJ Modifications, Warwickshire. Request a quote: info@mjmodifications.co.uk.

Search terms customers use

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