Toyota Supra MK5 steering wheel re-covering, flat-bottomed, Ar.A358
high-end build like yours, re-covering the Toyota Supra MK5 (A90/A91) steering wheel is a popular move, as the factory leather is often cited as being a bit thin for a performance car.
The Ar.A358 specification (often associated with high-grade Alcantara or specialized automotive Nappa leather) provides a much-needed increase in grip and tactile feedback, especially for high-horsepower applications where precise input is critical.
Custom Specification: Flat-Bottom & Ar.A358
Most professional re-covering services (like DCTMS, Carismo Design, or AZA Auto Wheel) follow this build sheet for the A90:
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Flat-Bottom Conversion: The lower arc of the factory round wheel is replaced with a CNC-machined or hand-shaped flat section. This provides extra thigh clearance and a clear “centered” visual reference.
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Ar.A358 Material: This specific grade of Alcantara (Deep Black) is UV-resistant and “anti-pilling.” It is designed to handle the friction of performance driving without getting “matted” as quickly as standard suede.
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Ergonomic Profiling: Services typically add “thumb rests” at the 10 and 2 o’clock positions and increase the overall rim thickness by 3–5mm for a “beefier” BMW M-style feel.
Technical Integration & Features
Since the Supra MK5 steering wheel is a BMW-sourced unit, it contains sensitive electronics that must be handled carefully during the re-cover:
| Component | Handling Requirement |
| Heating Element | If your Supra has a heated wheel, the heating mat must be carefully stripped and re-glued under the new Ar.A358 layer. Note: Thicker leather can slightly increase warm-up time. |
| Vibration Motor | The Lane Departure Warning motor is housed in the 6 o’clock spoke. It must be re-seated perfectly to avoid “rattling” against the new flat-bottom frame. |
| Touch Sensors | For cars with advanced Driver Assist, the capacitive “Hands-On” sensors are embedded in the rim. Ensure your upholsterer is experienced with BMW G-Chassis wheels to avoid disabling these safety features. |
Aesthetic Customization Options
To complement the Ar.A358 Alcantara, most owners add these finishing touches:
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12 O’clock Stripe: A “Center Marker” in a contrasting color (e.g., Renaissance Red or Stratosphere Blue) to match your exterior.
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Stitching Pattern: The “Tri-Color” M-stitching is common, but a solid “Cross-Stitch” in silver or red provides a cleaner, OEM+ look.
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Extended Paddle Shifters: Since the wheel will be off the car, it is the perfect time to swap the small plastic OEM paddles for Magnetic Carbon Fiber units or billet aluminum extensions.
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