FD.15 forged wheels RA Mansory for Mercedes-AMG S63E

Mansory FD.15 RA Wheel for Mercedes-AMG S63E

The FD.15 RA is the rear-axle counterpart to the FD.15 FA, sharing the split-spoke pattern but with rear-specific dimensions: a wider section to fill the W223 LWB rear-arch volume and carry the 4MATIC+ AWD system's rear-axle traction load, plus a different offset that keeps the wheel face flush with the rear-quarter shoulder of the AMG-spec body. The S 63 E PERFORMANCE drives torque to all four corners through 4MATIC+, but the rear axle takes the traction work under hard launch and on-throttle exits — peak load on the rear-axle hubs at full-power launch with the AMG biturbo V8 PHEV's 802 hp / 1430 Nm summed output is significantly higher than at sustained cruise. The wheel's forged construction handles that brief while the wider section visually completes the saloon's rear-quarter wide-body geometry. It is part of the parent Mansory Carbon Fiber Body kit set for Mercedes-AMG S63E.

Construction & Materials

The rear-axle's higher traction load demands a slightly stiffer rim section than the front, which the FD.15 RA delivers through a wider rim flange and a thicker spoke root at the hub junction.

• Material: 6082-T6 aluminium billet, single-piece forged (same as FA variant)
• Construction: monoblock forged, multi-axis CNC machined to final geometry
• Diameter: 23"; width: 11" (wider than FA)
• PCD: 5x112; centre bore: 66.5 mm; offset: ET 30 (lower than FA's ET 35)
• Mass per wheel: 12.6–13.4 kg (slightly heavier than FA due to wider section)
• Spoke root reinforcement: thicker at hub junction for traction-load transfer
• AMG ceramic-brake caliper clearance: verified to OEM AMG-spec for rear caliper
• Finish options: identical to FA (gloss black, satin black, full-polished, custom anodising)

Design & Visual Function

The wider section is the key visual difference from the FA — at 11" wide vs the front's 9.5", the rear wheel fills the W223 LWB rear-arch volume in a way that the front wheel doesn't (and shouldn't) at the front fender. Visually this gives the saloon a stance with broader rear shoulders, which is consistent with the OEM AMG-spec wide-body styling at the rear. Owners specifying the lowering suspension alongside the FD.15 RA get a particularly tight-stanced rear-quarter look.

Tyre selection at the rear matters more than at the front for the visual register — a 295-section tyre on an 11" rim sits at the OEM-spec sidewall stretch, while a 305 or 315 rim-and-tyre combination produces a slightly more emphatic rear-shoulder read. Owners tracking the car typically stay at the OEM-spec section width for handling consistency; owners staging the car for events sometimes specify a wider tyre-and-rim combination for the visual impact. Both options are dimensionally compatible with the FD.15 RA's rim flange.

The rear-axle wheel is loaded harder under hard launch than the front-axle wheel is loaded under hard braking, and the spoke root reinforcement at the hub junction handles that load transfer without flex. Under throttle the rear wheel does not deflect at the rim flange — a meaningful engineering consideration on a 802 hp / 1430 Nm AWD chassis. The OEM AMG rear-brake caliper (smaller than the front but still substantial) is cleared at all positions; AMG ceramic rear-brake calipers (where specified) are also accommodated.

Visually the rear pair coordinates with the front pair through the shared split-spoke pattern; the dimensional difference (wider, lower offset) reads as appropriate proportional difference rather than mismatch. Owners looking at the saloon from a three-quarter front angle see two paired wheels of the same family at the front and back; the wider rear is a refinement of the same design rather than a different wheel.

Compatibility & Fitment

Engineered for Mercedes-AMG S 63 E PERFORMANCE (W223), 2023+, long-wheelbase saloon, rear axle. PCD 5x112, centre bore 66.5 mm, offset ET 30. Compatible with AMG iron-brake and AMG ceramic-brake packages on the rear axle. AMG Night Package and AMG Carbon Package cars are supported. The wider rear section requires verification against any aftermarket rear-arch lowering or non-AMG-pattern fender modifications; statically check before installation. The wheel works with Mansory's lowering suspension at the calibrated lowered ride height.

Installation & Reversibility

Plan 60–80 minutes per axle (both rears) on a hoist with one technician. Required tools: OEM-pattern wheel-bolt torque wrench, 17 mm bolt-head socket, anti-seize compound, OEM AMG-spec wheel-balance machine. The OEM TPMS sensors transfer from the OEM rear wheels during install. Bolt torque is OEM specification at 130 Nm. Reversibility is full — OEM wheels can be reinstalled at any time without modification of the rear-axle hub or the rear-arch geometry.

Pairing within the Mansory Mercedes-AMG S63E programme

Most often combined with the matching FD.15 FA for the front axle, with the Lowering suspension for a coordinated lowered-stance programme, and with the Rear decklid spoiler performance for a coordinated rear-aero-and-stance programme.

Maintenance & Durability

Rear wheels see different wear from front wheels — less brake-dust (rear brake is smaller and less heavily used than front), more under-acceleration tyre-contact-patch heating that translates to wheel-rim heat soak on long highway pulls. Routine wash cycle: pH-neutral wheel cleaner, soft mitt; avoid acid-based wheel cleaners. Apply a ceramic wheel sealant quarterly. Inspect wheel-bolt torque at every tyre service. The rear-axle is the location for tyre rotation considerations on AWD cars; if the OEM tyre-rotation pattern includes axle-swapping, the FD.15 RA cannot rotate to the front (different width), so OEM rotation patterns become front-pair-and-rear-pair rotations only. Stone strikes can be polished out with a fine cut compound. Cosmetic-finish lifespan: 8–10 years with routine care.

Lead Time & Warranty

Production turnaround: 6–8 weeks for the rear-pair set, identical to the FA front pair. Specifying both pairs together as a four-wheel set adds nothing to the build window because both pairs run on the same forging line. Custom finishes (matte, satin, custom anodising) add roughly two weeks. Warranty: 12 months against manufacturing defects — forging integrity, dimensional accuracy, finish adhesion, traction-load transfer at the spoke root — running from delivery date. Outside warranty: stone-strike damage, kerb-rash damage, finish degradation from acid-based cleaners.

FAQ

Q: Is the FD.15 RA rear-axle-specific or interchangeable with the FA front?
A: It is rear-axle-specific. The width and offset are dimensioned to the rear-axle hub geometry; running it on the front would clash with the front-axle's narrower section.

Q: What is the rear-axle offset specification?
A: ET 30, lower than the FA's ET 35. This is matched to OEM AMG rear-axle specification and gives the rear-quarter the OEM-appropriate flush-with-fender position.

Q: Will the wheel work with run-flat tyres?
A: Yes. The OEM W223 saloon's run-flat tyres at OEM-AMG specification fit the FD.15 RA's rim section and bead seat geometry.

Q: Does the rear wheel transfer the OEM TPMS sensor?
A: Yes. The OEM TPMS sensor transfers from the OEM rear wheels to the FD.15 RA during install; OEM tyre-pressure monitoring continues to operate.

Q: Will the rear wheel clear AMG-spec rear ceramic brakes?
A: Yes. The spoke geometry is calculated around the OEM AMG ceramic rear-brake caliper envelope.

Q: Does the wheel affect the AMG biturbo V8 PHEV's traction-control behaviour?
A: No. The OEM ECU and the OEM 4MATIC+ system continue to operate at OEM specification; the wheel is dimensionally OEM-compatible and the OEM tyre-spec preserves the rolling-radius the system expects.

Q: Can the rear wheel run a wider tyre than OEM specification?
A: Yes within the rim flange envelope — 305 or 315-section tyres are dimensionally compatible. Owners specifying wider tyres should verify rear-arch clearance statically.

Q: Will the rear wheel run as part of an asymmetric front/rear set-up where only the rear is upgraded?
A: Possible but not recommended for visual coherence. Asymmetric sets (FD.15 RA at rear with OEM 21" AMG at front) read as mismatched at any normal viewing distance.

Q: Does the wider rear-axle section affect the saloon's lateral g-load behaviour?
A: At identical tyre specification, no. The OEM AMG-spec tyre at the OEM-pattern rim flange behaves as the OEM ECU and 4MATIC+ system expect.

Q: How does the wheel handle hard-launch traction at full-power?
A: Spoke-root reinforcement at the hub junction transfers the traction load without rim flex. The wheel is rated for the AMG biturbo V8 PHEV's full output at typical track-day launch frequencies.

Pair the FD.15 RA rear pair with the matching FD.15 FA front, the lowering suspension, and the performance decklid spoiler for a coordinated rear-aero-and-stance programme. To configure your build, message WhatsApp +44 7488 818 747 or write to [email protected].