Solid vs. Collapsible Hub Adapters
Looks the same.
Works very differently.
by Mads – Last updated April 2026
What Is a Hub Adapter?
If you install a non-factory steering wheel, you need one thing: a hub adapter.
It connects the steering wheel to your steering column.
Every car has its own spline and mounting system.
That’s why hub adapters are always vehicle-specific.
On top, most classic steering wheels use a standard bolt pattern: 6×70 PCD.
Simple in theory.
Critical in practice.
Solid vs. Collapsible – The Real Difference
At first glance, both types look similar.
They are not.
Solid Hub
- one-piece construction
- rigid connection
- period-correct appearance
- no energy absorption
A solid hub does exactly one thing: it holds the steering wheel in place.
No more. No less.
Collapsible Hub
- multi-piece internal structure
- designed to deform under load
- absorbs impact energy
- developed for safety
Inside, these hubs are anything but simple.
They are engineered to reduce the force transferred to the driver in a crash.
One looks better.
The other might save your face.
(Please don’t buy a used one)
Why Collapsible Hubs Exist
Older cars weren’t designed with modern safety in mind.
No airbags.
Minimal crumple zones.
Steering columns that don’t forgive mistakes.
That’s exactly why collapsible hubs were developed.
They introduce a controlled weak point between:
- steering column
- and steering wheel
- anodized black
- precise fitment
So in the event of an impact: the hub gives — instead of you.
The Problem with “Solid Look” Conversions
There’s a trend:
People take collapsible hubs
and try to make them look solid.
3D-printed covers.
Custom sleeves.
Clean, smooth finishes.
It looks great.
But it completely misses the point.
A solid look on a collapsible hub defeats the entire purpose.
That “wrinkled” rubber cover?
It’s not a design flaw.
It’s part of the function.
What sits underneath is designed to collapse.
Cover it up, stiffen it, or lock it in place —
and you reduce or eliminate that function.
Which One Should You Choose?
Go Solid if:
- you’re building a show car
- period-correct aesthetics matter most
- the car is rarely driven
- speeds stay low
Go Collapsible if:
- you actually drive the car
- you drive at speed
- you use the car on track
- safety is part of your thinking
Most people choose with their eyes.
The better choice is made with your spine.
My Recommendation
If your car moves more than it stands: get a collapsible hub.
No debate.