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RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  Converting an oldschool 1 inch threaded headset to 1 1/8 threadless.
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Author Topic: Converting an oldschool 1 inch threaded headset to 1 1/8 threadless.  (Read 2482 times)

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bridgecity

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only found one thread on this subject that was 120 days old. Server message said to create a new thread for the subject:

You should have a good grasp of the 1 1/8 threadless concept first:
http://www.bmxmuseum.com/forums/viewtopic.php?id=30761

Yes, this truly works, it isn't just a myth:
This is 1978 melded with 2007 technology.


Overview: Old school frames used a 1 inch headset and a threaded fork.  Nowadays vintage threaded forks and nice necks are quite pricey.
New School bikes use a little bigger fork at 1 1/8inch, it is threadless and has a stem that pinches tight against the fork. Very reliable and easy to wrench.


What you'll need:
An 1 1/8 headset such as a cheap A-Headset you'd find on a low end bike.
A frame with 1 inch cups.

Step 1-  find a nice steerer tube race with a smooth curve.


Step 2- find a bearing cage that will slip over the fatter steerer tube as well as spin on the race.
This may be the hardest part of the process depending on the brand and style of parts you have available.
If all else fails you can run loose balls instead of the cage.
As long as everything fits and spins smoothly, you are golden. No perfect answers here.
What you see on this bike is a cheapo 1 inch bearing cage.


Step 3- get your parts in order.
From left to right; 1 inch bearing cage, race, plastic shim, dust cover, spacer.



Step 4- Stem assembly. Use proper tightening technique shown in the thread above.


Step 5- Ride for awhile. The bearing cages will settle into a good fit on the races. Retighten and Ride Vintage, baby!


The reasoning for something like this is simple.
-->The newschool parts are CHEAP in comparison to ebay vintage.
For example, the stem on this bike was dug out of the trash at the LBS and all it needs is a good sanding/polish, after being drilled for new bolts.
The old bikes are fun as heck to ride but era correct parts are getting pricey and they are delicate for us old fogies that are rarely at our old race weight.

kennyhunter6061

  • Guest
Re: Converting an oldschool 1 inch threaded headset to 1 1/8 threadless.
« Reply #1 on: February 02, 2008, 12:53 AM »
Here's another way of using a 1 1/8" ahead stem on threaded 1" forks.  Basically a 1" stem bolt which flares to 1 1/8" at the top, allowing you to attach whatever newschool stem you want.

http://cgi.ebay.co.uk/22-2mm-quill-to-1-1-8-ahead-threadless-stem-converter_W0QQitemZ320213380336QQihZ011QQcategoryZ56194QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

bridgecity

  • Guest
Re: Converting an oldschool 1 inch threaded headset to 1 1/8 threadless.
« Reply #2 on: February 15, 2008, 03:33 PM »
that's a very interesting piece of hardware.
don't know that those are available in the states.
thanks!

Offline monkeybat

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Re: Converting an oldschool 1 inch threaded headset to 1 1/8 threadless.
« Reply #3 on: December 16, 2012, 01:44 PM »
Cool thread.

Offline Discostu

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Re: Converting an oldschool 1 inch threaded headset to 1 1/8 threadless.
« Reply #4 on: December 16, 2012, 04:37 PM »
I done several threads on rad, how to do this 2 years ago.  :daumenhoch:

Offline garran

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Re: Converting an oldschool 1 inch threaded headset to 1 1/8 threadless.
« Reply #5 on: December 16, 2012, 05:27 PM »
Here's another way of using a 1 1/8" ahead stem on threaded 1" forks.  Basically a 1" stem bolt which flares to 1 1/8" at the top, allowing you to attach whatever newschool stem you want.

http://cgi.ebay.co.uk/22-2mm-quill-to-1-1-8-ahead-threadless-stem-converter_W0QQitemZ320213380336QQihZ011QQcategoryZ56194QQssPageNameZWDVWQQrdZ1QQcmdZViewItem


what about a potts mod with these quill shaft things?? anyone done it, and because they are ali are they strong enough and move??

RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  Converting an oldschool 1 inch threaded headset to 1 1/8 threadless.
 

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