Bicycle Mechanics - 1 inch threaded stem in 1 1/8 threaded bicycle ..shim ?

Hello, my bicycle is going to be shutdown for a little while for some
upgrades/repairs.

I have a backup bike frame that uses a 1 1/8 threaded

Anyone know of an adapter for a threaded nitto 1' stem to fit in
the 1 1/8 threaded bicycle ?

I see a few adapters for the opposite conversion.

The closest i have seen is for threadless conversion here.

http://www.benscycle.net/index.php?main_page=product_info&products_id=6126&currency=USD

If i do find a shim to that would let me throw the 1 inch to the 1 1/8 bicycle would have a 1/8 gap where the stem goes into the frame? Will i also need some type of reducer shim to get rid of that 1/8 gap?

thanks so much for your help.

What adapters are there to fit a 1 1/8" (25.4mm quill) stem into a 1" (22.2mm quill) hole? THis seems to defy logic.

Anyhoo, there used to be shims available to fit 22.2 stems into 25.5 holes but I am having trouble finding one right now. I am sure they still exist, though...

Your reading it backwards.
Nitto tectonic deluxe threaded stem = 1
http://www.rivbike.com/products/show/nitto-technomic-deluxe/16-044

Bicycle with 1 1 1/8 steer tube that takes a threaded stem that is 1 1/8

I am having problems finding one also thats why I am posting :)



What adapters are there to fit a 1 1/8" (25.4mm quill) stem into a 1" (22.2mm quill) hole? THis seems to defy logic.

Anyhoo, there used to be shims available to fit 22.2 stems into 25.5 holes but I am having trouble finding one right now. I am sure they still exist, though...

I found this...

http://www.niagaracycle.com/product_info.php?products_id=2116

Which seems to come with the correct shim (all for only $8), but the comment in all caps in the description makes me pause to think. Perhaps call up a supplier such as Niagra and see if they know of one that is currently available.

Your reading it backwards.
Nitto tectonic deluxe threaded stem = 1
http://www.rivbike.com/products/show/nitto-technomic-deluxe/16-044

Bicycle with 1 1 1/8 steer tube that takes a threaded stem that is 1 1/8

I am having problems finding one also thats why I am posting :)

I think you may be writing it backwards :)

It is impossible to fit a 1 1/8" stem into a 1" steerer tube, unless the physical laws of the universe have been suspended - there is no 'adaptor' that will expand the hole or shrink the stem.

i dont have a 1 steer tube. As in my first post as well as the post topic

1 1/8 steer tube.

1 inch stem.

Stem is smaller then tube. Need part

The link you sent is for threaded to threadless. I have threaded fork and threaded stem.

You need to learn to write more clearly. My comment about shrinking stems and expanding steerers was in regards to your comment in the OP that you have seen "a few adaptors for the opposite conversion." WHat you want is a shim to fit a 1" quill into a 1 1/8" steerer so the 'opposite' would be to fit a 1 1/8 quill into a 1" steerer, which I believe is impossible. If I am wrong and there are product that allow 25.4mm quills to fit into 22.2mm steerers, please provide a link as I cannot picture how this could work.

The link I provided is for a threaded-to-threadless adaptor that also includes a shim to fit the 22.2mm quill into a 25.4mm steerer - and that is what you want, right? For $8 you can use just the shim and not use the threaded to threadless adaptor.

Ah got it. I meant opposite meaning thread-less to threaded not size. Easier to talk to someone face to face. Thanks. What about the gap in the headset when using that shim.

1" threaded: 25.4mm on the outside, 22.2mm on the inside. Uses 22.2mm quill stems
1-1/8" threaded: 28.6mm on the outside, 25.4mm on the inside. Uses 25.4mm quill stems

1" threadless: 25.4mm on the outside. Uses 25.4mm threadless stems
1-1/8" threadless: 28.6mm on the outside. Uses 28.6mm threadless stems.

Ah got it. I meant opposite meaning thread-less to threaded not size. Easier to talk to someone face to face. Thanks. What about the gap in the headset when using that shim.

The shim will fill the gap... that is its only purpose. But call the vendor before deciding as there is something weird in the description of that part.

The shim would fill the gap, but the smaller wedge would still need to be dealt with for a tight, stable fit, I would think. If you can find an cheap 1 1/8 in quill stem (like a Profile Boa), you could see if the larger wedge would fit the Nitto bolt. I was trying to accomplish the same thing, and finally decided that a threadless to threaded adapter and threadless stem looked better than a skinny quill stem in a 1 1/8 in steerer tube, even with the shim.
CC

1-1/8" quill stem is for 1-1/4" threaded forks.
you need a 25.4mm quill stem for 1-1/8" threaded forks, or a 22.2mm to 25.4mm shim with a 22.2mm quill stem.

1-1/8" quill stem is for 1-1/4" threaded forks.
you need a 25.4mm quill stem for 1-1/8" threaded forks, or a 22.2mm to 25.4mm shim with a 22.2mm quill stem.

Generally speaking, when one refers to a 1" stem, they mean a stem that fits into or onto a 1" fork... 22.2mm quill or 25.4mm clamp; talking about 1 1/8" stems generally refers to 25.4mm quill or 28.6 clamp. I guess the rule is that we refer to the OD of the steerer, not the OD or ID of the stem.


The shim would fill the gap, but the smaller wedge would still need to be dealt with for a tight, stable fit, I would think. If you can find an cheap 1 1/8 in quill stem (like a Profile Boa), you could see if the larger wedge would fit the Nitto bolt. I was trying to accomplish the same thing, and finally decided that a threadless to threaded adapter and threadless stem looked better than a skinny quill stem in a 1 1/8 in steerer tube, even with the shim.
CC
I think you are making this more complicated than it needs to be.
If one has a 22.2mm diameter quill stem, the wedge will also be 22.2mm. If this stem is to be used with a shim in a 25.4mm ID steerer, then a shim with thickness (25.4-22.2)/2, or 1.6mm needs to be used. THe shim will slide over the quill to increase its diameter to 25.4mm, and also slide over the 22.2mm wedge to increase its diameter to 25.4mm Therefore, both quill and wedge should have a good fit with the 1" -> 1 1/8" shim.

A shim designed for quill stems has slits cut into it, so it won't interfere with the expander wedge.
A shim designed for seatposts does not, so don't use seatpost shims for steerers.



Generally speaking, when one refers to a 1" stem, they mean a stem that fits into or onto a 1" fork... 22.2mm quill or 25.4mm clamp; talking about 1 1/8" stems generally refers to 25.4mm quill or 28.6 clamp. I guess the rule is that we refer to the OD of the steerer, not the OD or ID of the stem.


The places I buy from all list their 22.2mm quill stems with 22.2mm in the specs with a "for 1" threaded forks" in the description.

Split shim [1" OD, 7/8" ID, a 1/16" wall tube] will expand inside the steerer tube ,
under the force of tightening the stem wedge inside the shim,
But it should be long enough to support the stem from the bottom where the wedge is,
to the top of the minimum insertion line on the stem..

for the same reason that the minimum insert line was put on the stem in the first place, safety.