Headset question

!Jones said:

Referencing an older 1", threaded headset.

What is the difference between a "BMX" device described above and the
more traditional headsets?

The reason I ask is that I'm doing a restoration on an old BMX. I'm
not being real picky about parts like headsets and brackets... if they
fit, I'll use 'em.

http://www.sheldonbrown.com/gloss_ha-i.html#headset

Designed for a smaller steerer tube diameter.

On Sun, 09 Sep 2007 18:18:16 +0100, in rec.bicycles.tech Zog The

Undeniable said:

http://www.sheldonbrown.com/gloss_ha-i.html#headset

Designed for a smaller steerer tube diameter.

I shoulda known to check Sheldon's site.

So, I can't drop a 1" fork designed for a recumbant 20" wheel into a
BMX frame without major modification.

Rats!

Jones

in rec.bicycles.tech !Jones said:

On Sun, 09 Sep 2007 18:18:16 +0100, in rec.bicycles.tech Zog The

Undeniable said:

http://www.sheldonbrown.com/gloss_ha-i.html#headset

Designed for a smaller steerer tube diameter.

I shoulda known to check Sheldon's site.

So, I can't drop a 1" fork designed for a recumbant 20" wheel into a
BMX frame without major modification.

Rats!

Jones

Well... they're both 26.4 on the inside race. I'm going to hit the
problem when I try to screw on the top race because the steerer tube
of the ISO std. will be too big by .047. So, if I were to put it on
an OD grinder, take it down to .833, and recut the threads, it should
work. Even if there is some thread left after grinding, that's OK
because they're both 24 tpi.

Jones

!Jones said:

What is the difference between a "BMX" device described above and the
more traditional headsets?

The reason I ask is that I'm doing a restoration on an old BMX. I'm
not being real picky about parts like headsets and brackets... if they
fit, I'll use 'em.

That's the difference. They are not the same size as road 1" headsets.

--

David L. Johnson

The lottery is a tax on those who fail to understand mathematics.

!Jones said:

Referencing an older 1", threaded headset.
What is the difference between a "BMX" device described above and the
more traditional headsets?
The reason I ask is that I'm doing a restoration on an old BMX. I'm
not being real picky about parts like headsets and brackets... if they
fit, I'll use 'em.

Same thread, 'BMX' has a smaller opening in the locknut for a USA stem
and larger frame cups.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

Quoted message said:

On Sun, 09 Sep 2007 18:18:16 +0100, in rec.bicycles.tech Zog The

Undeniable said:

http://www.sheldonbrown.com/gloss_ha-i.html#headset
Designed for a smaller steerer tube diameter.

!Jones said:

I shoulda known to check Sheldon's site.
So, I can't drop a 1" fork designed for a recumbant 20" wheel into a
BMX frame without major modification.

Rats!

Change the locknut. Or ream it. It's stem diameter not steerer OD.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

in rec.bicycles.tech A Muzi said:

Change the locknut. Or ream it. It's stem diameter not steerer OD.

Yeah, thanks... I finally gleaned that after reading carefully. I
think I'm going to shim the fork... it's a $10 fork and a $100
headset. The fork is just holding a place until a Littlejohn fork
appears on eBay to match the frame. It will, sooner or later.

Jones

On Sun, 09 Sep 2007 21:22:43 -0400, in rec.bicycles.tech "David L.

Johnson said:

!Jones said:

What is the difference between a "BMX" device described above and the
more traditional headsets?

The reason I ask is that I'm doing a restoration on an old BMX. I'm
not being real picky about parts like headsets and brackets... if they
fit, I'll use 'em.

That's the difference. They are not the same size as road 1" headsets.

Yeah, got it... but it's a frame issue as I read it. The 1" dimension
really is one inch and the inside race is the same.

Now, I have never had a "threadless" headset and I'm not sure I'm
reading Sheldon right. The threaded Vs. threadless thing is entirely
a function of the *fork* & headset and independent of the frame, am I
right?

Jones