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

New: Take Part in the May's Giveaway: Win the LIVALL PikaBoost 2 E-bike Conversion Kit


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
 
31,256
05-19-2012, 03:14 AM
Last Post: GeorgeET

Forum Jump:

[-]
10 Latest Posts
Colnago restoration
Today 12:39 PM
Urtopia Carbon Fold
Today 12:25 PM
POLL: Are non-recumbent riders looking a...
Today 10:58 AM
Wearable Fitness Trackers
Today 10:30 AM
Safest bike helmets
Today 09:55 AM
Gu/SiS/Energy Gels replacement
Today 09:29 AM
How waterproof are eBikes?
Today 08:20 AM
Ebike
Yesterday 07:08 PM
What was your first bicycle?
Yesterday 08:51 AM
Rookie looking for a bike
05-17-2025 03:25 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. Flowrider
20 posts
no avatar 2. Painkiller
19 posts
no avatar 3. GirishH
16 posts
no avatar 4. enkei
15 posts
no avatar 5. meamoantonio
12 posts