Stack Height (Reposted as my News server has been down)

DB4 said:

Hi

I need to buy a new headset for my MTB. (older style threaded 1 inch) The
retailers on the web refer to 'stack height'. I'm guessing this relates to
how much of the fork stem you have available for the headset in question but
what exactly does the dimension refer to? What do I measure to check the
stack height of my existing headset?
Thanks.

Measure from the top of the head tube to the top of the lock nut.

DB4 said:

Hi

I need to buy a new headset for my MTB. (older style threaded 1 inch) The
retailers on the web refer to 'stack height'. I'm guessing this relates to
how much of the fork stem you have available for the headset in question but
what exactly does the dimension refer to? What do I measure to check the
stack height of my existing headset?

Most threaded 1" headsets are made to fit a fairly narrow stack height
range; I have seldom encountered a situation where a replacement 1"
threaded headset didn't work due to this issue. It's not hard to find
out what stack height you have now, however. Just measure the length
of the head tube on your frame, and then measure the distance from the
bottom of the lower bearing to the top of the nut; the difference
between these two measurements is the stack height. If the
replacement headset has a higher stack height, beware; it probably
won't work. If the replacement headset has a lower stack height than
what you have now, it will work; you may want to add a washer or
spacer (as needed) to fill the extra space instead of cutting down the
tube. The spacers may already be present in your old headset, in
which case you can simply recycle them. BTW, the little tab on the
inside of the washers is completely unnecessary; a tabless spacer
works just fine.

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DB4 said:

I need to buy a new headset for my MTB. (older style threaded 1 inch) The
retailers on the web refer to 'stack height'. I'm guessing this relates to
how much of the fork stem you have available for the headset in question but
what exactly does the dimension refer to? What do I measure to check the
stack height of my existing headset?

See:
http://www.sheldonbrown.com/gloss_st-z.html

Art Harris

Thats great guys - Clears it up for me. thanks for the help
Regards,
Dennis
"DB4" <[email hidden]> wrote in message
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Quoted message said:

Hi

I need to buy a new headset for my MTB. (older style threaded 1 inch) The
retailers on the web refer to 'stack height'. I'm guessing this relates to
how much of the fork stem you have available for the headset in question
but
what exactly does the dimension refer to? What do I measure to check the
stack height of my existing headset?
Thanks.

Dennis