Headset question

[!Jones]

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.

Jones

 

[Zog The Undeniable]

!Jones wrote:
> 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.

 

[!Jones]

On Sun, 09 Sep 2007 18:18:16 +0100, in rec.bicycles.tech Zog The
Undeniable <[email protected]> wrote:

>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

 

[!Jones]

On Sun, 09 Sep 2007 18:07:29 GMT, in rec.bicycles.tech !Jones
<****@off.com> wrote:

>On Sun, 09 Sep 2007 18:18:16 +0100, in rec.bicycles.tech Zog The
>Undeniable <[email protected]> wrote:
>
>>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

 

[David L. Johnson]

!Jones wrote:

> 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.

 

[A Muzi]

!Jones wrote:
> 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

 

[A Muzi]

> On Sun, 09 Sep 2007 18:18:16 +0100, in rec.bicycles.tech Zog The
> Undeniable <[email protected]> wrote:
>> http://www.sheldonbrown.com/gloss_ha-i.html#headset
>> Designed for a smaller steerer tube diameter.

!Jones wrote:
> 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

 

[!Jones]

On Sun, 09 Sep 2007 21:22:16 -0500, in rec.bicycles.tech A Muzi
<[email protected]> wrote:

>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

 

[!Jones]

On Sun, 09 Sep 2007 21:22:43 -0400, in rec.bicycles.tech "David L.
Johnson" <[email protected]> wrote:

>!Jones wrote:
>
>> 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