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Old 08-04-10, 06:32 AM   #1
the_don
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1996 Klein Quantum pro stem change! HELP!

Hi, brief intro, just got a Klein 1996 model, pretty much perfect except for a small ding on the TT, nothing serious. I haven't bought it as such yet, but it is from a friend and has a full 2007 Dura-Ace groupset on it and Aksium Race wheels and he is asking $1200 for it, which seems fair considering the groupset.

The frame is sweet, it rides really nice, but I find it a little too stretched out, I know the steerer is 1-1/16th, so does that mean I can put a 1-1/8th stem on it with a shim?

i hate the look of the stock stem and I see a lot of photos on your blog page of similar year bikes with different stems. So I want to get a shorter stem (Thomson preferably)

What can I do???

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Old 08-04-10, 07:31 AM   #2
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The MC3 stem is more normal looking (normal stem clamp), you probably won't hate it as much.
But yeah, several stem makers sell 1 to 1-1/8" shims and you just need one that's half as thick.
Klein used to sell such a part.
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Old 08-04-10, 06:53 PM   #3
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I have been searching the interwebs to no avail shim wise.

I might try the coke can shim method!
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Old 08-04-10, 10:23 PM   #4
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If the sizes are correct--1 1/16 from 1 1/8 would take a total of .0625, or shim thickness of .03125 (since the shim goes around the tube, only half the total for each side is required). Most auto parts stores should have .030 shim stock.
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Old 08-05-10, 12:08 AM   #5
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Don't forget any spacers will also need to be shimmed.
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Old 08-05-10, 01:43 AM   #6
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Quote:
Originally Posted by badamsjr View Post
If the sizes are correct--1 1/16 from 1 1/8 would take a total of .0625, or shim thickness of .03125 (since the shim goes around the tube, only half the total for each side is required). Most auto parts stores should have .030 shim stock.
I live in Japan...

I don't do inches, only metric, i hate all this 1 1/16" business, I much prefer to use the mm

I think it's about a 1 1/16" = 26.9875mm

1 1/8" = 28.575mm

Difference of about 1.5875mm so 0.79375mm thickness shim

A coke can sidewall is about 0.13mm thickness so 5-6 layers of can should do it!

Cheap and easy to cut to measure!

I might go to the bike shop on the way home tonight to get a Thomson stem, some spacers and a can of coke!
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Old 08-05-10, 02:14 AM   #7
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although how does the MC2 stem clamp to the steerer tube? I thought I saw a lock nut when I took off the Klein top cap.

Does it work the same as a normal stem? do I need to get a star nut as well?

i guess I don't need to keep the crappy rubber klein top cap.
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Old 08-05-10, 02:29 AM   #8
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Hang on, how do i get an Airhead set wrench????

this is insanity!
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Old 08-05-10, 06:30 AM   #9
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I wouldn't get rid of any parts. I'm pretty sure that this vintage of quantum pro used a "collet" type of stem. These were proprietary for Klein. You can search out a different length of Klein stem but I don't believe you can put a 1-1/8" ahead type stem on there. No expert on this subject, just a fan of the quantum pro - especially this vintage.
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Old 08-05-10, 07:24 AM   #10
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Yes, he has a collet clamp for the steerer.

But the steerer is bonded to the bearings so he doesn't need a star nut.

What's different is the stem doesn't set the bearing compression; so there's no star nut, no top adjuster, and you don't even need the spacers but it'll look kind of funny without them.

The MC3 stems have regular clamps for the steerer.
Proper shims and a Thomson stem will work fine.

Take a photo sequence and post here for the next guy who asks.

Last edited by DiabloScott; 08-05-10 at 01:32 PM.
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Old 08-05-10, 05:44 PM   #11
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Will do, need to get my hands on a tool first!
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