What is PCD?
Every steering wheel has a story — but before you can enjoy it behind the wheel, it must fit perfectly. Whether you own a Momo, Nardi, Ferrero, or any other vintage or modern steering wheel, knowing the bolt pattern (PCD) is essential.
The PCD – Pitch Circle Diameter defines the diameter of the circle that passes through the center of all the bolts on your wheel. Six bolts in a 70mm circle? That’s 6x70mm. Different brands and even different models from the same brand often have varying bolt patterns.
This guide helps you quickly identify which steering wheels fit which hubs, and shows when a hub adapter may be necessary—perfect for classic car restorations, racing setups, or modern custom builds.
Common Steering Wheel Bolt Patterns
Here’s an overview of frequently used bolt patterns in classic and modern sports steering wheels:
PCD / Bolt Pattern
Brands / Wheels
3 x 50.8mm
Sparco, Sport Line
6 x 70mm
Momo, Ferrero (Fiat 124 Spider), Grip Royal, Circuit Performance, Motocorsa, NRG, OMP, Sparco, Sabelt, Simoni, Sport Line, Vertex
6 x 74mm
Nardi, Luisi, Personal, Raid
6 x 75mm
Ferrero (except Fiat 124 Spider)
6 x 80mm
Fusina
9 x 4″
Lecarra, Moto Lita, Springalex
5 x 2.75″
Grant, Victor
6 x 2.75″
Grant
3 x 1.75″
Grant
Important Takeaways
If the PCD doesn’t match, you cannot safely bolt your wheel to the hub.
- Always check that PCD of your wheel and hub are perfectly matching.
- 6x70mm is the most common European sports car standard.
- Special adapters exist to mount wheels across brands safely.
- Using mismatched PCDs or forcing a fit is dangerous.
Understanding PCD may sound technical, but it’s the single most important specification for fitting any aftermarket steering wheel.
