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Old 12-30-10, 06:30 PM   #1
luckett
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1" steerer to 1 1/8" stem conversion

I need to be sure I'm getting the proper parts I need for this conversion from a 1" stem to 1 1/8". The height of the steerer shim is greater than the 1 1/8" stem height and I have a 1" top cap. When I put this on, the 1" top cap will be compressing the shim and spacer stack while the 1 1/8" stem will have vertical play until tightened. Is that the way it should be done or will I need a 1 1/8" top cap and/or spacers?
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Old 12-30-10, 06:53 PM   #2
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use some 1 1/8 spacers and 1 1/8 top cap
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Old 12-30-10, 07:33 PM   #3
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Ideally that is the cleanest way to do it, but this is on my cross bike so I have a lot of steerer (85mm). The amount of steerer will be more than the height of the shim so there is not enough shim height to stack 1 1/8" spacers from the headset to stem. If I went with all 1 1/8" spacers, I would have to get extra shims to enable me to stack spacers like that. The spacers would then be stacked on diametrically uncompressed shims. Are there any issues with that?

I'd like to stick with the 1" spacers if possible. Will it work safely with the 1" bits?

Last edited by luckett; 12-30-10 at 08:01 PM.
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Old 12-30-10, 07:42 PM   #4
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I'm confused here. You speak of shims and spacers, but from my understanding of how to set up a steerer tube, the shims and spacers are the same thing. Is that correct, or am I missing something.
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Old 12-30-10, 07:48 PM   #5
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Shim to go from 1" diamter steerer to 1 1/8" diameter stem


Spacers to stack vertically between the headset and stem


If I went with 1 1/8" spacers, I'd have to stack two of those shims vertically. (unless there is a really tall shim out there I haven't seen)
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Old 12-30-10, 07:56 PM   #6
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o i thought your shim had a lip on it. the way you said it in your first post will be fine once tightened
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Old 12-30-10, 08:09 PM   #7
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.. top cap in a threadless steerer presses down on the top edge of the stem,
[so It must be 1.125" type]
and the spacer rings beneath the stem, to do the headset pre load adjustment.

Then you tighten the pinch bolts in the stem around the fork steerer to maintain that adjustment.
if the fork steerer is a 1" type, then the shim tube makes up the difference
between the 1 inch steerer OD and the 9/8 inch stem ID, it is 1/16th of an inch thick.
so when wrapped around the 1" tube the new OD is 1.125"..
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Old 12-30-10, 08:13 PM   #8
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Almost all 1-1/8" stems come with a reducer bushing to let them fit a 1" steerer. So, add 1" spacers as needed, above the headset and below the stem, then add the stem with it's reducer above the spacers. The reducer will let the 1" spacers work properly. Use just enough spacers below the stem to let the steerer to project about 3 above the stem. Then, above the stem add a 5 mm 1" spacer and put the top cap on top of it.
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Old 12-30-10, 08:15 PM   #9
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Quote:
Originally Posted by fietsbob View Post
.. top cap in a threadless steerer presses down on the top edge of the stem,
[so It must be 1.125" type]
No it doesn't have to be a 1-1/8" top cap if you use a 1" spacer ABOVE the stem.
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Old 12-30-10, 08:16 PM   #10
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Originally Posted by fietsbob View Post
1, .. top cap in a threadless steerer presses down on the top edge of the stem
But isn't the 1" top cap pressing on the 1" shim that is pressing on the 1" spacers. Which can then be tightened in place with the stem pinch bolts. I'm not seeing why it wont work with the 1" bits. Someone explain to me why I'm an idiot and I'm going to die with the 1" bits.
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Old 12-30-10, 08:23 PM   #11
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But isn't the 1" top cap pressing on the 1" shim that is pressing on the 1" spacers. Which can then be tightened in place with the stem pinch bolts. I'm not seeing why it wont work with the 1" bits. Someone explain to me why I'm an idiot and I'm going to die with the 1" bits.
Yes you're right.

Your 1" top cap will press down on 1" spacers. You do not need 1 1/8 spacers.
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Old 12-30-10, 08:28 PM   #12
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If the shim tube is continuing the transfer of the compression of all the spacers exerted by tightening the bolt
in the top cap, then all is good. the stem is gripping the shim and squeezing it ,
which in turn is squeezing the slotted tube around the steerer tube ..
a gap above the the top of the steerer tube to the stem top edge, is typically how 9/8" stuff is set up.

insure that the gap cut in the shim is facing back so it gets squeezed by the stem, effectively.
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Old 12-30-10, 08:39 PM   #13
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....a gap above the the top of the steerer tube to the stem top edge, is typically how 9/8" stuff is set up..
It's also how 1" stuff is set up. But if the steerer is carbon, leaving the steerer long enough to require a spacer above the stem is a good idea and useful with any other steerer material too. In this case it will allow a 1" top cap to be used with a 1-1/8" stem.
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Old 12-30-10, 11:27 PM   #14
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It's also how 1" stuff is set up. But if the steerer is carbon, leaving the steerer long enough to require a spacer above the stem is a good idea and useful with any other steerer material too. In this case it will allow a 1" top cap to be used with a 1-1/8" stem.
He's heading for a darwin award with 85mm of exposed steerer on a 1" system anyways. 1" carbon systems tolerate much less spacers than 1 1/8.
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Old 12-31-10, 12:12 AM   #15
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You could make one .. access to a few machine tools,
you could always use a single tube to serve as spacers and the shim.
just need a slot, where the stem grips, so it can compress that portion,
around the actual steerer tube..

Last edited by fietsbob; 12-31-10 at 06:44 PM.
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Old 12-31-10, 05:15 PM   #16
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He's heading for a darwin award with 85mm of exposed steerer on a 1" system anyways. 1" carbon systems tolerate much less spacers than 1 1/8.
Yeah but I have to assume (hope?) the 85 mm includes about 40 mm for the stem? Even so, a 1" carbon steerer still won't tolerate the residual 45 mm of spacers but a steel steerer will. Most 1-1/8" carbon steerers would too.
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Old 12-31-10, 06:43 PM   #17
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Hopefully it will be sandy muddy course if it does break,
then He will just go down in a soft goo.

Is it carbon steerer Luckett ? I dont read you offering that detail,
just others have suggested so ..
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Old 12-31-10, 08:50 PM   #18
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You guys seem to be enjoying the idea that it's carbon so much that I hate to bring you back to reality!

It's a chunky AL steerer and I've been hammering on it for over ten years, so I don't expect to be doing any Hincapie impressions with it soon.
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Old 12-31-10, 09:18 PM   #19
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You guys seem to be enjoying the idea that it's carbon so much that I hate to bring you back to reality!

It's a chunky AL steerer and I've been hammering on it for over ten years, so I don't expect to be doing any Hincapie impressions with it soon.
That steerer broke because it was previously crashed. Not because it was weak.
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Old 12-31-10, 11:20 PM   #20
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Originally Posted by HillRider View Post
Almost all 1-1/8" stems come with a reducer bushing.
I sold numerous brands of stems and don't remember any being supplied with a shim, or reducer bushing. They are available separately of course.
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