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Race-Ready D-Shape Feel and Leather Grip for Street Performance and Track Days
The Granatelli Motor Sports GMS789464 is a 10-inch diameter D-shaped steering wheel built for drivers who want a more focused, purposeful connection to their vehicle in performance and track environments. The flat bottom of the D-shape clears the driver's thighs during entry and exit, reduces the rotational arc during aggressive driving, and gives the wheel a cockpit-inspired look that suits both dedicated track cars and performance street builds. The steering wheel features a black leather grip wrapped around a solid construction core, with black steel spokes providing a clean, minimal appearance that fits naturally in sport and race-oriented interiors. It requires a vehicle-specific hub adapter for installation and is compatible with Granatelli's matching switch plates for drivers who want to mount auxiliary controls directly to the wheel.
Key Features
- D-Shaped Flat-Bottom Design: Flat bottom provides clearance for driver entry and exit, reduces rotational throw during spirited driving, and delivers a race-inspired cockpit appearance
- 10in Width x 9in Height: Compact diameter compared to most factory steering wheels for quicker steering response and a more direct, connected feel
- Black Leather Grip: Wrapped leather grip provides tactile feedback and a secure hold during performance driving without the harshness of bare aluminum or hard plastic
- Black Steel Spoked Construction: Clean three-spoke steel spoke design in black finish resists corrosion and maintains a consistent appearance over time
- Switch Plate Compatible: Accepts Granatelli single, double, mushroom twin, and 2-button twin switch plates sold separately for auxiliary button or toggle control mounting directly on the wheel
- Hub Adapter Required: Bolts to any standard Momo/Sparco 6-bolt 70mm hub adapter pattern; a vehicle-specific hub adapter is required for installation and sold separately
Specifications
| Detail | Value |
|---|---|
| Part Number | GMS789464 |
| Brand | Granatelli Motor Sports |
| Diameter | 10 in (width) |
| Height | 9 in |
| Shape | D-Shaped (flat bottom) |
| Grip Material | Black Leather |
| Spoke Material | Black Steel |
| Bolt Pattern | 6-bolt, 70mm (Momo/Sparco pattern) |
| Switch Plate Compatible | Yes (single, double, twin variants) |
| Hub Adapter | Required, sold separately |
| Fit | Universal |
| UPC | N/A |
What's Included
- 1x Granatelli Motor Sports D-shaped steering wheel
- Center horn button hardware
- Mounting hardware
About Granatelli Motor Sports
Granatelli Motor Sports carries a legacy rooted in the Granatelli family's storied history at the Indianapolis 500 and NHRA drag racing. The company produces performance drivetrain accessories, interior components, and electrical parts designed for builders pursuing both street performance and competition-level builds across a wide range of platforms.
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Frequently Asked Questions
What is the GMS789464?This is a Granatelli Motor Sports 10-inch D-shaped steering wheel with a black leather grip and black steel spokes. It uses a standard 6-bolt 70mm hub pattern and is designed for performance street and track builds requiring a compact, flat-bottom wheel with an optional switch plate mounting system.
Do I need a hub adapter to install this steering wheel?Yes. This wheel uses a standard 6-bolt 70mm bolt pattern compatible with Momo and Sparco hub adapters. A vehicle-specific hub adapter matched to your steering column is required and sold separately. Select a hub adapter rated for your year, make, and model to ensure proper fitment and airbag system compatibility.
Will this steering wheel work with my factory airbag?No. Removing a factory steering wheel disables the factory airbag system. This wheel is designed for dedicated track vehicles or street vehicles where the owner has chosen to delete the factory airbag in favor of a harness and roll cage setup. Never install an aftermarket steering wheel on a street-driven vehicle without fully understanding the airbag and legal implications in your jurisdiction.
What switch plates are compatible with this steering wheel?Granatelli makes four switch plates designed specifically for this wheel family: the single, double, mushroom twin, and 2-button twin variants. Each plate mounts directly to the face of the wheel and accepts .635-inch barrel-style switches or buttons, letting drivers position auxiliary controls within reach without leaving the wheel. All four are available as separate listings on our site.
What is the advantage of a D-shaped steering wheel over a round wheel?The flat bottom of a D-shaped steering wheel creates additional clearance between the wheel and the driver's legs during entry and exit, which is particularly useful in low-bucket sport seats with a narrow cabin. During driving, the flat section reduces the rotational arc of the wheel at the 6 o'clock position and can improve high-input driving feel in tight cockpit environments. D-shaped wheels are a common upgrade in track and performance street builds for both function and cockpit aesthetics.
Is this steering wheel street legal?The wheel itself is a legal aftermarket product. However, removing a factory steering wheel eliminates the factory airbag system, which may violate traffic safety laws in some states or jurisdictions. Check local regulations before installing any aftermarket steering wheel on a street-registered vehicle. This product is most commonly used in dedicated track vehicles and competition builds.
What diameter is this steering wheel and how does it compare to a factory wheel?This wheel measures 10 inches in width and 9 inches in height. Most factory steering wheels range from 14 to 16 inches in diameter. The smaller diameter requires less rotational input to achieve the same steering angle, producing a quicker, more responsive feel that suits performance driving and track use. Drivers transitioning from a factory wheel should allow time to adjust to the reduced diameter.
Does this steering wheel include a horn button?Mounting hardware and center horn button hardware are included. Verify compatibility between the horn button and your chosen hub adapter before completing installation, as horn circuit wiring varies by hub manufacturer and vehicle application.
Installation Instructions
- Disconnect the vehicle battery negative terminal and allow at least 10 minutes for any airbag system capacitors to discharge before proceeding.
- Remove the factory steering wheel according to the vehicle service manual; retain the factory nut and any reusable hardware.
- Install the vehicle-specific hub adapter onto the steering column shaft per the hub adapter manufacturer's instructions. Torque the hub adapter retaining nut to specification.
- Route any horn wiring through the hub adapter per the hub manufacturer's guidance.
- Align the steering wheel with the hub adapter bolt pattern and seat it flush against the hub face.
- Install and hand-tighten all six mounting bolts before torquing them evenly to the hub adapter specification, typically 10 to 12 ft-lbs for shoulder bolts.
- Connect the horn wiring to the horn slip ring on the hub adapter.
- Install any desired switch plates before fitting the center horn button.
- Install the center horn button and verify it seats and engages correctly.
- Reconnect the battery, test the horn, and verify full steering lock-to-lock without interference before returning the vehicle to service.
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