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How To Convert 1inch Threaded To 1 1/8 Threadless  RSS Feed

#1 2008-01-26 3:41pm

BridgeCity
Guest

How To Convert 1inch Threaded To 1 1/8 Threadless

Converting an oldschool 1 inch headset to 1 1/8 threadless.

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.
http://i137.photobucket.com/albums/q211/m5h5m/Conversion001.jpg

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 Wal-goose.
A frame with 1 inch cups.

Step 1-  find a nice steerer tube race with a smooth curve.
http://i137.photobucket.com/albums/q211/m5h5m/Conversion002.jpg

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, once again, cheap Wal-goose parts.
http://i137.photobucket.com/albums/q211/m5h5m/Conversion003.jpg

Step 3- get your parts in order.
From left to right; 1 inch bearing cage, race, plastic shim, dust cover, spacer.
http://i137.photobucket.com/albums/q211/m5h5m/Conversion004.jpg
http://i137.photobucket.com/albums/q211/m5h5m/Conversion005.jpg

Step 4- Stem assembly. Use proper tightening technique shown in the thread above.
http://i137.photobucket.com/albums/q211/m5h5m/Conversion006.jpg

Step 5- Ride for awhile. The bearing cages will settle into a good fit on the races. Retighten and Ride Vintage, baby!
http://bmxmuseum.com/image/pandaquad2_copy0_lg.jpg

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.
This particular bike is mild steel, but I'd have no fear of doing some smooth dirt jumping on it.

Last edited by BridgeCity (2008-05-05 7:48pm)

 

#2 2008-01-27 9:00pm

coasty
Pro Member
From: Queensland, Australia
Registered: 2007-03-25
Posts: 3194
Bikes: 18

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

Nice work. Exactly what I'm doin right now with a Mongoose Villain retro style!


70's bmx is where it's at.

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#3 2008-01-28 6:23am

BridgeCity
Guest

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

could you post your bike when finished.
We should get folks to put their examples on this thread, when finished.
(Coasty, am i ever going to get a sign up confirmation email for your site?)

 

#4 2008-02-02 1:15pm

airvillan2000
Member
From: New York
Registered: 2007-09-03
Posts: 29
Bikes: 12

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

awsome ! about to try this on an aluminum frame

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#5 2008-02-11 9:42am

jonblack
Centurion Member
From: Downsville, LA
Registered: 2007-12-20
Posts: 227

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

Aheadset makes a freestyle version so you can run the front brake cable through the steer tube.

jonblack

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#6 2008-02-11 9:53am

BridgeCity
Guest

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

the pic is kind of blurry but that is the kind of stem bolt pictured. passes through if you wanted to run a cable.

 

#7 2008-02-15 7:08am

noneck7
Museum Newbie
From: Milwaukee, WI
Registered: 2008-02-14
Posts: 6

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

Incredible! Thanks for the excellent info and details!!

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#8 2008-03-11 6:27pm

latin.pitbull
Intermediate
From: East Coast
Registered: 2007-07-09
Posts: 432

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

There're a  few more ways you can do it.Later on I'll add them I have done this years agos 1 1/8 is better  and nicer looking stems.That's one reason I started but mostly was for the 990 mounts on the 11/8 forks,I don't like the plates!
http://bmxmuseum.com/forums/viewtopic.php?id=38489
http://bmxmuseum.com/forums/viewtopic.php?id=37382

Last edited by latin.pitbull (2008-03-11 6:42pm)


Yesterday's design with today's touch!

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#9 2008-03-11 7:41pm

BridgeCity
Guest

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

good info you shared. smile
someone on the UK site mentioned that kind of item. it looks very ingenuitive but i've never seen one up close.
really whatever works and works safely is cool.

 

#10 2008-04-06 1:15pm

amancalledspike
Museum Newbie
From: Franklin, IN
Registered: 2008-04-04
Posts: 3

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

Delta Cycle makes a threadless converter.

http://www.deltacycle.com/product.php?g=8

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#11 2008-04-06 2:19pm

Zooch
Museum Newbie
From: Dallas, TX
Registered: 2007-12-09
Posts: 13
Bikes: 1

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

this one's been posted before, another alternative.

http://www.choppersus.com/store/product … s-Adapter/

Anyone had any luck using someething like a Tioga BearTrap threaded headset and 1 1/8 threadless headset and doing this conversion? Thats what I was planning on using and was just curious if I it'll work.

Cheers,
-Brian

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#12 2008-04-06 5:42pm

BridgeCity
Guest

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

Using the items above would depend on whether you wanted a a 1 1/8th fork or threaded 1 inch fork.

It wouldn't work out for this setup because my intension was to put a newer fork on the older bike.
http://www.bmxmuseum.com/image/gtrims_lg.jpg

 

#13 2008-04-07 11:42pm

91GT347
Museum Addict
From: Jacksonville, NC
Registered: 2008-02-28
Posts: 1468

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

Damn. I pretty much just asked this in another thread. I want to do it to my profile because I cant find original forks for it..... Or if I do find them the price is rediculous.

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#14 2008-04-08 8:44pm

Zooch
Museum Newbie
From: Dallas, TX
Registered: 2007-12-09
Posts: 13
Bikes: 1

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

BridgeCity wrote:

Using the items above would depend on whether you wanted a a 1 1/8th fork or threaded 1 inch fork.

It wouldn't work out for this setup because my intension was to put a newer fork on the older bike.

I'm actually looking to put a new 1 1/8 threadless fork/stem combo on my Elf and was wondering if anyone ever used the 1" cagess and cups from a Tioga Bear Trap and all the other 1 1/8 threadless headset compoents. Has this combination been tried with any success?

Although, I may use the stem conversion on my son's Elf ...

Cheers
Brian

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#15 2008-04-09 12:53am

wraith81
Museum Addict
From: Melbourne Australia
Registered: 2007-12-26
Posts: 1174
Bikes: 9

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

This is awsome i have always wondered if it was possible


----- !!!!!DONT THINK FEEEEEEEEL!!!!! -----
             ----- I NEED -----   
----- FREESTYLE FORKLIFTER BARS -------
---------- RL240 frestyle decals.-----------

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#16 2008-04-09 1:08am

wraith81
Museum Addict
From: Melbourne Australia
Registered: 2007-12-26
Posts: 1174
Bikes: 9

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

gave it a crack but i havnt got it right yet


----- !!!!!DONT THINK FEEEEEEEEL!!!!! -----
             ----- I NEED -----   
----- FREESTYLE FORKLIFTER BARS -------
---------- RL240 frestyle decals.-----------

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#17 2008-04-13 5:18pm

dynopimp22092
WheelieKing
From: Hillsboro, MO 63050
Registered: 2007-04-14
Posts: 369
Bikes: 2
Website

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

how well does having loose ball bearings in the headset work?


Only one remains. 2000 Original Dyno Air.

2009 Cobalt SS.

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#18 2008-04-13 7:07pm

BridgeCity
Guest

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

i haven't tried looseball since i've been lucky in the old 70s folgers can O parts.

seems like it would be just fine as long as you remembered they were loose when disassembling so as not to lose everything in the dirt.

 

#19 2008-04-13 7:14pm

dynopimp22092
WheelieKing
From: Hillsboro, MO 63050
Registered: 2007-04-14
Posts: 369
Bikes: 2
Website

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

ive had loose ball bearings in my bb before it only worked for a while.
I think i'll give the headset a try.


Only one remains. 2000 Original Dyno Air.

2009 Cobalt SS.

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#20 2008-05-05 6:57pm

Zooch
Museum Newbie
From: Dallas, TX
Registered: 2007-12-09
Posts: 13
Bikes: 1

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

.. must be dumb luck, I used a Tioga Bear Trap 2 Threaded 1 inch Headset (cups and bearings) and a Aheadset  1 1/8 (http://www.danscomp.com/301006.php?cat=PARTS) the crown race is the type you need (no flange around the inside) to get this work. I'm sure there are some other optiosn out there  ...  i've got a long list of parts on order and this 20 should be rolling in a couple weeks.

http://i296.photobucket.com/albums/mm189/zooch_album/DSC_0048.jpg

http://i296.photobucket.com/albums/mm189/zooch_album/DSC_0049.jpg

http://i296.photobucket.com/albums/mm189/zooch_album/DSC_0200.jpg

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#21 2008-05-05 7:47pm

BridgeCity
Guest

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

When it all comes together to create a whole new dimension of riding, it feels great doesn't it?
Nice work on figuring out some exact brand details, too!  smile

 

#22 2008-05-15 10:31am

ElSteenio
Museum Newbie
From: London, UK
Registered: 2008-05-14
Posts: 2

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

Heeeeeeeelllllllllllllllllllllp!!

I am trying to fit 1 1/8th" forks to replace a threaded 1" fork. Having problems with the bearings and headset. Have a FSA flying pig headset (1 1/8) and the original bearings and cups which are quite done to be honest.

What would be the best way to set this up and what extra bits would i need to make it work??????

Thanks :-D

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#23 2008-05-15 10:52am

BridgeCity
Guest

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

is that fsa headset the one with the oversized lower bearing? if so, that one won't work for this project.

sounds like you may want to get some new "guts" per the models Zooch mentions above?

 

#24 2008-05-15 12:22pm

ElSteenio
Museum Newbie
From: London, UK
Registered: 2008-05-14
Posts: 2

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

Yeah it has the oversized lower bearings, i did a test drive with the smaller top bearings and they didn't fit into the 1" bearing cups.

Is it possible to grind out the inside of the tube a little so the bearing cups fit from the 1 1/8th or will that screw it all up??

Don't really have much money to spare for more headset bits.

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#25 2008-05-15 3:39pm

BridgeCity
Guest

Re: How To Convert 1inch Threaded To 1 1/8 Threadless

are you near a local bike shop? they probably have a pile of old leftovers they'd let you browse through. offer em 2 bucks for the stuff and they'll probably be cool with it.

 

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