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Stem Length/Tube Issue

Old 07-22-08, 04:50 PM
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spacerock
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Stem Length/Tube Issue

I'm trying to bring my handlebars closer so I've been looking at purchasing either the Nitto Technomic or Deluxe. I'm afraid the Technomic may be too long to give me the proper handlebar height when I insert it in the steerer tube.

As I gathered from Sheldon Brown's site, the end of the steerer tube is butted. Is this standard? Is there an easy way to measure where the tube becomes butted and thus determine how far the stem will descend into the tube? My tube doesn't really look butted but it's really hard to tell. I tried measuring how far the wedge attached to the bolt of my current stem would go but I can't tell if it won't go any farther because the tube is butted or because the tube looks a bit rusty.

My bike is a Lotus Challenger which I believe was manufactured by a Japanese company in the 80's.

Thanks.

Mike
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Old 07-22-08, 09:20 PM
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oldbobcat
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I've never heard of butted threaded steerers. My quill stems have always gone as far as the gooseneck or the brake bolt will let them, whichever comes first, on a variety of steel and aluminum bikes.

Try cleaning the inside of your steerer, maybe using a bottle brush and solvent. Then be sure to grease everything after it dries. Lotus made lots of nifty bike back in the day.
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Old 07-23-08, 04:02 AM
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orangepaint
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Originally Posted by oldbobcat View Post
I've never heard of butted threaded steerers.
Not true. Try inserting a long quill stem down a very short steer tube on a lugged crown fork. The steer tubes on lugged crown forks are butted.

I recommend this at your own risk but I have cut stems down so that they would go farther down the steer tube. Make sure you cut exactly parallel to the original end of the quill otherwise you will have to over-torque the wedge bolt for the stem to stay put. You can't do this with an expander wedge.

By the way, why would you buy a technomic if you didn't want your bars high?
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Old 07-23-08, 05:50 PM
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spacerock
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thanks guys. after looking it over again, regardless of whether it is butted or not, it looks like a technomic should fit to the height i want my handlebars (btw, orangepaint i do want my handlebars raised, i'm just afraid if my steer tube clearance is too small, i'd be stuck with really high bars, not just high bars). hopefully i won't realize i want them lower or if so, just cleaning up the tube will give me the extra room i need. thanks again.
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