Bearings in headsets

[Wester]

Are the bearings in threaded and threadless headsets the same size ?

 

[I like Skol]

Same size as what?

Not an arsy question, but there are so many options in either type that you simply cannot answer that question.

 

[MontyVeda]

Same size as what?

Not an arsy question, but there are so many options in either type that you simply cannot answer that question.

presumably as each other... but you raise a valid point

 

[Ajax Bay]

Are the bearings in threaded and threadless headsets the same size ?

While it might not strictly be the correct answer, the best answer is 'no'.
On that basis, what's the next question?

 

[Ming the Merciless]

Bearings aren’t even same size between all threadless headsets. There are a number of different standards in use.

 

[SydZ]

In short,no.

Either the bearing size, or part number is usually stamped into the bearing and can be used to search for the exact replacement you require.

 

[Ajax Bay]

Don't think proper bearings (eg for threaded headsets) are anything but spherical @SydZ . The balls certainly aren't "stamped" but do come in different diameters and may come caged or not.
Who said anything about "replacement"?
We need Q2 to progress.

 

[midlife]

Some thread headsets are needle / roller bearing

http://bikeretrogrouch.blogspot.com/2013/10/roller-needle-bearing-headsets.html

 

[I like Skol]

I think (and I'm assuming a lot here) what the OP might mean is....
If a manufacturer does threaded and threadless versions of the same model of headset, will these use the same bearings?

To which my answer would be... Don't count on it!

 

[SydZ]

Don't think proper bearings (eg for threaded headsets) are anything but spherical @SydZ . The balls certainly aren't "stamped" but do come in different diameters and may come caged or not.
Who said anything about "replacement"?
We need Q2 to progress.

Yes. I should have been clear I was referring to modern threadless headsets

 

[Ming the Merciless]

Plus threaded likely 1” and threadless 1 1/8”

 

[Smokin Joe]

Some thread headsets are needle / roller bearing

http://bikeretrogrouch.blogspot.com/2013/10/roller-needle-bearing-headsets.html

My headset of choice back in the days of quill stems. I never wore one out and I don't think I ever had to even adjust one. I used to regard ball bearings as the work of Satan before threadless came along.

 

[fossyant]

Nope. If you are lucky, you'll still have the details printed on the side of the bearing, number etc. If not, you'll need to do some googling.

 

[midlife]

My headset of choice back in the days of quill stems. I never wore one out and I don't think I ever had to even adjust one. I used to regard ball bearings as the work of Satan before threadless came along.

Would that be the Stronglight A9?

 

[Smokin Joe]

Would that be the Stronglight A9?

The last one I remember using was made by VP. I'm not sure if they are still around, but I remember they also made pedals and probably other bits and pieces too.