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

New: Take Part in the May Giveaway for a Change to Win the Thruster 27.5 Retrograde BMX Cruiser Bike


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
 
28,551
05-19-2012, 03:14 AM
Last Post: GeorgeET

Forum Jump:

[-]
10 Latest Posts
Fat bikes for ever..
Today 01:12 PM
Adding brake to kids balance bike
Yesterday 11:06 PM
YABD - vintage Bernard Carré frame, etc
Yesterday 07:13 PM
What are your best tips for long rides?
Yesterday 10:34 AM
Classic MTB: Kirk Revolution DC magnesiu...
06-11-2024 06:03 PM
Forgot to introduce myself!
06-10-2024 10:19 PM
Problem > Solution
06-10-2024 09:41 PM
tried absolutely everything to fix these...
06-08-2024 04:05 PM
Tips for Cyclists
06-08-2024 01:39 PM
Hello!
06-08-2024 12:42 PM

[-]
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. Jesper
46 posts
no avatar 2. enkei
29 posts
no avatar 3. Dusan
16 posts
no avatar 4. Amanda_W
12 posts
no avatar 5. meamoantonio
9 posts