Fully Forged 21 inch wheels with carbon splitter Black glossy Mansory for Ferrari 296 GTB

Fully Forged 21 Inch Wheels with Carbon Splitter Black Glossy Mansory for Ferrari 296 GTB

The wheel is the most functionally loaded component in any exterior programme — it bears the full static and dynamic weight of the car, transmits all longitudinal and lateral forces to the tyre contact patch, and is visible in motion at every speed from walking pace to circuit velocity. The Mansory Fully Forged 21 Inch Wheels with Carbon Splitter in Black Glossy finish represent the mid-diameter option in the programme's forged wheel range, combining a fully forged aluminium hub and spoke structure with carbon-fibre splitter fins that fill the spoke openings and introduce a secondary aerodynamic function to the wheel design. As part of the Mansory Carbon Fiber Body kit set for Ferrari 296 GTB, these wheels are designed around the 296 GTB's PHEV platform constraints — the 830 hp total output demands wheel-and-tyre combinations capable of sustained high-torque loading under electric motor boost, the rear-biased weight distribution requires rear-tyre contact patch management across the torque delivery spectrum from silent EV creep to full hybrid launch, and the battery pack's additional mass must be considered when calculating unsprung weight contribution of the wheel-tyre assembly.

Construction & Materials

The wheel hub and spoke structure is fully forged from 6061-T6 aviation-grade aluminium alloy in a closed-die forging press at 600 °C, producing a fine-grain metallurgical structure with approximately 30 % higher yield strength than cast aluminium wheels of equivalent mass. The forging process eliminates the porosity and dendritic grain structure that characterise cast wheels, enabling a spoke wall thickness of 6 mm at the spoke mid-section — a dimension that would require 10–12 mm in cast aluminium to achieve the same fatigue life under the 296 GTB's combined static and dynamic loading. Each wheel is machined post-forge on a 5-axis CNC lathe to a dimensional tolerance of ±0.05 mm at the barrel bore and ±0.1 mm at the spoke profiles. The carbon-fibre splitter fins are individually hand-layed in 3K twill pre-preg, autoclave-cured at 120 °C, and bonded into the spoke openings using a high-temperature structural adhesive rated to 180 °C operating temperature — well above the wheel surface temperatures encountered in brake-heat soak scenarios. Tyre specification for the 21-inch front fitment is 245/35 ZR21; rear fitment is 305/30 ZR21.

• Construction: fully forged 6061-T6 aluminium, closed-die at 600 °C, fine-grain microstructure
• Yield strength advantage: ≈30 % over cast aluminium at equivalent wheel mass
• Spoke wall: 6 mm at mid-section (vs. 10–12 mm required in cast for equivalent fatigue life)
• CNC post-forge machining: 5-axis, barrel bore ±0.05 mm, spoke profile ±0.1 mm
• Carbon splitter fins: 3K twill pre-preg, autoclave 120 °C, bonded with 180 °C-rated structural adhesive
• Finish: gloss-black wheel body; gloss-lacquered carbon splitter fins
• Tyre specification (front 21"): 245/35 ZR21; (rear 21"): 305/30 ZR21
• Centre bore: 71.6 mm to match 296 GTB hub; hub-centric fit with supplied aluminium hub rings
• Bolt pattern: 5×130 (Ferrari standard); wheel nuts supplied in titanium-grade alloy

Design & Visual Function

The carbon splitter fins that fill the spoke openings of this wheel serve a dual purpose: aerodynamic and visual. Aerodynamically, the fins rotate with the wheel at road speed, creating a low-pressure extraction effect at the wheel face that draws hot air from the brake disc and caliper zone outward through the spoke openings — a passive brake cooling mechanism analogous to vane-style wheel cooling designs used in racing. At 100 km/h, the wheel rotates at approximately 970 rpm; the centrifugal pressure gradient across the rotating fin array creates a measurable outward airflow through the spoke channels that supplements the static ventilation provided by the wheel's open-spoke geometry. For the 296 GTB's carbon-ceramic brake system, which can reach disc temperatures of 800–900 °C on circuit, any additional thermal extraction from the brake zone contributes to disc and caliper longevity.

Visually, the carbon fins introduce a material contrast at the spoke openings — the gloss-black aluminium spoke faces frame each fin's exposed 3K twill weave, creating a visual layering effect that gives the wheel face a depth that solid-face or plain-spoke designs cannot achieve. In motion, the rotating carbon weave pattern produces an animated visual effect that distinguishes the wheel from forged wheels without the fin insert. The 21-inch diameter is the mid-size option in the Mansory range, offering a tyre sidewall profile of 35 mm front and 30 mm rear that balances the low-profile appearance associated with performance specificationagainst the ride quality that the 296 GTB's adaptive suspension system is calibrated to manage over road surfaces.

The gloss-black body finish is achieved through a two-stage process: a primer coat applied to the machined aluminium surface for adhesion, followed by a high-build gloss black powder coat cured at 180 °C, producing a smooth, chip-resistant surface with a 90+ GU gloss level. The powder coat process applied over forged aluminium — rather than cast — produces a finish that remains intact under the flex cycling of a high-performance tyre, where cast surfaces are susceptible to micro-crack propagation under the coating layer that eventually causes flaking.

Compatibility & Fitment

These wheels are engineered for the Ferrari 296 GTB coupé (2022+), 296 GTS spider (2023+), and 296 Assetto Fiorano. The 296 platform uses a 5×130 bolt pattern and 71.6 mm centre bore — matched by these wheels with supplied aluminium hub rings. The 21-inch diameter fits within the 296 GTB's front and rear arch clearances at standard suspension ride height; confirm clearance with the specific tyre profile selected if running non-standard tyre dimensions. The OEM tyre-pressure monitoring system (TPMS) sensors from the OEM wheels can be transferred to the Mansory wheels by a tyre shop at the time of tyre fitting; new OEM-compatible TPMS sensors are also available if originals are retained on the OEM wheel set. Assetto Fiorano underbody carbon panels do not affect wheel fitment clearance. LHD and RHD configurations use the same wheels.

Installation & Reversibility

Wheel installation requires tyre fitting at a tyre shop equipped for low-profile performance tyres — 35 and 30-series profiles require a no-tyre-iron, tyre-machine-only fitting process to avoid bead damage. Mount the supplied aluminium hub rings in the wheel centre bore before fitting. Torque the 5 × M14×1.5 titanium wheel nuts to 120 Nm in a star pattern. TPMS sensors should be registered to the car's system via a Ferrari diagnostic tool after installation; most tyre shops and Ferrari dealers can perform this registration. The OEM wheels and tyres are preserved and can be refitted in a standard wheel change operation. Track use with these wheels on slick or semi-slick tyres is possible; confirm load rating of the chosen tyre against the 296 GTB's front/rear axle loads.

Pairing within the Mansory 296 GTB programme

These 21-inch carbon-splitter wheels are the mid-diameter option; pair with the Fully Forged 22 Inch Wheels with Carbon Splitter Black Glossy Mansory for Ferrari 296 GTB if a larger diameter profile is required. For owners who prefer the carbon-splitter visual without the gloss-black body colour, the Fully Forged 21 Inch Wheels Black Glossy Mansory for Ferrari 296 GTB offers the same forged construction without the carbon fin insert. The wheel programme pairs naturally with the Rear Diffuser with Brake Light Mansory for Ferrari 296 GTB as a combined performance and visual upgrade at the rear of the car.

Maintenance & Durability

Forged aluminium wheels with powder-coat finish and carbon splitter inserts require a structured cleaning regime. Use a dedicated wheel cleaner rated for use on powder-coated and carbon surfaces; avoid acid-based wheel cleaners that attack the carbon adhesive bond at the fin-to-spoke interface. The carbon splitter fins should be cleaned from the wheel face inward using a soft-bristle wheel brush; do not use metal-bristle brushes that abrade the lacquer on the fin face. After cleaning, apply a wheel-specific wax or ceramic coating to the powder-coat surface to resist brake dust bonding. Brake dust from the carbon-ceramic brake system is particularly abrasive and iron-rich — it bonds to the wheel surface more aggressively than conventional brake pads produce; clean within 24 hours of any session where heavy braking has been sustained. Inspect the carbon fin bond at the spoke edges annually; any cracking at the adhesive interface should be addressed immediately before water ingress causes the adhesive layer to delaminate. The wheel's load rating and structural integrity should be assessed by a specialist if the wheel has sustained a significant kerb strike or pothole impact, even if no visible damage is apparent.

Lead Time & Warranty

Forged wheel sets carry a lead time of 4–6 weeks from order confirmation — the closed-die forging schedule and post-forge CNC machining are batch processes that require lead time to accommodate the wheel's specific diameter, width, and bolt-pattern specification. The 12-month manufacturer's warranty covers forging structural integrity, carbon fin bond adhesion, finish quality, and dimensional fitment accuracy at the hub bore and bolt pattern. Impact damage, kerb strikes, and finish degradation caused by incorrect cleaning chemistry are outside warranty scope. Contact Hodoor with order reference and photographs for warranty claims.

FAQ

Q: Can the OEM TPMS sensors be reused with the Mansory wheels?
A: Yes — the 296 GTB's OEM TPMS sensors are standard valve-stem type and can be dismounted from the OEM wheels and refitted to the Mansory wheels by any tyre shop during the tyre fitting process. After fitment, the sensors must be re-registered to the car's TPMS ECU; this requires a Ferrari diagnostic tool or a TPMS programming tool compatible with the 296 GTB's system. New OEM-compatible sensors are also available as an alternative.

Q: Does the 21-inch fitment require any suspension modification?
A: No — 21-inch wheels with the specified tyre profiles are within the 296 GTB's OEM arch clearance envelope and do not require suspension modification. Confirm with your tyre supplier that the specific tyre brand and model you select has a rolling circumference within 2 % of the OEM specification to avoid speedometer and stability-control calibration error.

Q: Are the carbon fins structurally necessary, or purely decorative?
A: The carbon fins contribute to brake cooling at speed through the centrifugal extraction mechanism described, but the wheel structure is fully capable of carrying all mechanical loads without the fins. The fins are structurally independent of the spoke load path and their function is primarily aerodynamic/thermal and visual.

To configure your 21-inch forged wheel specification or discuss pairing with the tyre programme, contact us via WhatsApp +44 7488 818 747 or [email protected].