Rear springs — failure and pneumatic fixes

Tags: #springs · #price · #mazda-6-compat

Summary: the X80's stock rear springs are a known weak point (cracked or sagging coils, bottoming out under load). The community's fixes fall into four groups: replacement springs from other cars (Mazda 6, CX-5, Kia Sorento and others), spacers under the springs for lift, air bellows (пневмобаллоны) inside the coils, and diagnosis of what actually failed. The hub keeps the core failure, sourcing and part-number facts; the detail sits in the sibling cards listed at the bottom.

Failure pattern: rear springs have a reputation for weak reliability. One owner had both rear springs fail at 75,000 km. Spec for reference: 13.7mm wire thickness (community treats ~13mm+ as acceptable), 6–7 coil turns per side. Overloading — e.g. 4 people plus cargo in a vehicle rated for a lighter load per its registration — contributes to premature failure ¹.

OEM availability/cost: original rear springs were available (Oct 2024) at the FAW official dealership in Moscow (Autogermés, Sormovskaya branch, reachable via the main website → transfer to parts department → reserve). Stock was limited — 6 units found in October 2024 — and reported to sell out quickly ².

Aftermarket alternative: Chinese aftermarket springs from Kitparts.ru, ~3,310 RUB (RU market, October 2024) per pair (left/right identical), matching the original 13.7mm rod diameter. Inferior-quality copies (12.6–12.8mm rod) reportedly fail within 1.5–3 months. Other cross-fit sources: Mazda OEM springs (16mm rod, compatible) and Honda Stepwgn springs (16mm rod, need a minor custom spacer with rubber pads to fit). Toyota/Honda alternatives beyond the Stepwgn require significant customization and are not recommended ³.

Disagreement — springs alone vs. spacers vs. pneumatic bellows: one contributor (Олег Белоусов) recommends pneumatic air-spring bellows (Belarusian brand) as the primary fix over stronger springs; others argue 2cm spacers are essential for proper fitment regardless of spring choice. Two owners (Сергей Куликов, Олег) both experienced failure with weak aftermarket springs, but had success either with original springs plus pneumatic bellows, or with Mazda donor parts ³.

OEM rear spring part number — 5CA028011: the rear spring's own OEM FAW part number, referenced in catalogs for all X80 model years (2013–2021), is 5CA028011; cross-brand analogs sold under this listing include SF2598 / ZC6416H / ST119065R (see the cross-brand options documented elsewhere on this card) ⁴. The community's earliest recorded mention of the Kayaba/KYB 6416 cross-brand rear spring/shock option (see the detailed KYB RH6416 wire-thickness comparison elsewhere on this card) dates back to an early, terse report simply citing "Kayaba 6416" for the rear springs ⁵.

Reference. Victor's Drive2 post "14. Эпопея с задними пружинами и амортизаторами" (rear springs and shocks saga) documents his work in detail: https://www.drive2.ru/l/741593106217980020/ ⁶.

See also: - Rear springs — failure symptoms and diagnosis — Symptoms, causes and diagnosis of failing or sagging rear springs: sag, bottoming out, rattles, coil collapse. - Rear springs from Mazda 6 — cross-fit reports — Mazda 6 GG, GH and GY rear springs on the X80: fitment by generation and body style, ST119065R, results and conflicts. - Rear springs — other donors, rod sizes, ride height — Non-Mazda-6 donors (CX-5, Kia Sorento, BMW X3, Lesjöfors, KYB), wire diameters, coil counts, ride-height measurement and a new spring project. - Rear spring spacers and lift — Rubber, PTFE and polyurethane spacers under the rear springs: thickness, real lift, brands, fitment limits and prices. - Rear pneumatic bellows — field reports and pressures — Owner reports on air bellows inside the rear coils: sizes, valves, bump-stop trimming, working pressures and load tests.

Related existing cards: - Rear air suspension — pneumatic installation guide - Rear spring replacement and alignment - Coil springs — aftermarket numbers and sag

Media

Failed rear suspension springs found during tire change at 75k km

Kitparts supplier page where replacement springs were sourced

Failed rear spring, side by side with new replacement

Related pages

• Rear springs — other donors, rod sizes, ride height
• Rear springs from Mazda 6 — cross-fit reports
• Rear spring replacement — spacers and alignment
• Front coil springs — failure and sourcing
• Coil springs — aftermarket numbers and sag

Sources

This page is compiled from 6 community messages. Every fact carries a numbered reference to its original author and message.

Last updated: 2026-10-29