Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.


42mm Inside Diameter Head Tube
#1
Hi Everyone.
New to the forum.
I have an older dual suspension mountain bike, a giant ATX900. It has a weird head tube inside diameter of 42mm, which puts it somewhere in between the old 1 1/4" standard and the 1 1/2" standard.
Anyone know what type of head set was intended for this diameter head tube?
Cheers
Cam
  Reply
#2
You need a 1 1/8 headset. Google "head tube diameter" One helpful result: http://en.wikipedia.org/wiki/Head_tube. Also, just Google "42mm headset." http://www.ebay.com/sch/i.html?_kw=42mm+headset
  Reply
#3
Thanks.

I've been able to figure out it is a now obsolete Microtech Integrated head set that never became standard.

It used a 1 1/8 steerer with bearings press fit directly into the frame.

The closest modern standard is a Zero Stack headset with 44mm head tube inside diameter.

So my options are ream the head tube out to 44mm or get a machine shop to make a custom reducer.

Anyone know anything about reaming? For example, how thin could I make the walls of the head tube before I weaken them so much that they fail?
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
31,974
05-19-2012, 03:14 AM
Last Post: GeorgeET

Forum Jump:

[-]
10 Latest Posts
How to improve cycling endurance? I've h...
Today 06:27 PM
Hot Weather Safety
Today 06:05 PM
Variation in Conti GP5000 sizing?
Today 05:42 PM
Budget Gravel Bikes - useful YouTube vid...
Today 03:43 PM
Continued learnings from bikepacking
Today 08:37 AM
Cleats idea. What do you think?
Today 08:28 AM
Has anyone tried one of these portable e...
Today 06:43 AM
2007 Trek Pilot S.P.A. 5.2
Yesterday 09:08 PM
First long distance ride..
Yesterday 09:45 AM
Doctors are Prescribing Cycling
06-28-2025 05:42 AM

[-]
Join BikeRide on Strava
Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom

[-]
Top 5 Posters This Month
no avatar 1. GirishH
26 posts
no avatar 2. Flowrider
19 posts
no avatar 3. meamoantonio
13 posts
no avatar 4. rydabent
12 posts
no avatar 5. enkei
10 posts