bicyclepost

Hey all, the quill stem on my bike is extremely difficult to move up or down and remove from the fork. I thought maybe it was seized but when I finally got the bolt loosened (though it still doesn't turn easily) I was able to wiggle out the stem after probably almost an hour of work and some chain lube. The stem would twist back and forth but moving it up and down was an extremely slow process and impossible without the wiggling. Here are some photos. Does this look normal to you? I'm new to bike mechanics and it doesn't look how I thought it would. It also doesn't slide back into the fork, though I haven't tried too hard yet. What could the problem be and what should I do next? Thanks.

curbtender

I'm wondering if it was over tightened and that flared the stem at the bottom.

Chuck M 

It looks like you may not have loosened the bolt enough as the wedge still appears to be engaged with the stem. You should usually be able to loosen the bolt until it starts to extend out of the stem and then rap it with a soft mallet or block of wood and that should loosen it enough for removal.

KCT1986

The top part of the wedge shape on the stem is broken or chipped badly. The bottom of the stem should have wedge shape that is similar to the wedge on the expander nut. Totally unscrew the bolt and you'll see what the wedge shape looks like.

Tightening the bolt should cause the 2 wedge shapes to slide against each other and expand to lock against the steerer tubes inside.

KCT1986

SurferRosa

The wedge is in backwards. Post 5 shows how the wedge should be oriented on the bolt at the bottom of the stem. Also, the first pic in the op makes it appear as if the bottom of the stem is damaged.

Pop N Wood

SurferRosa nailed it. Clean it up and check for gouges before trying to reuse. If that one gouge is real bottom of the stem will need to be repaired. If there is sufficient length cut a quarter inch off the bottom of the stem then taper all the sharp edges with fine grit sand paper.

bicyclepost

The wedge was definitely in backwards. I've cleaned it up but the end of the stem is rough. I live in an apartment and don't have any tools to cut the stem. Do you think I could just sand this with lots of manual labour?

KCT1986

A bit more cleanup is needed. The wedge shaped portion of stem and the expander needs to be able to slide against each other when the bolt is tightened. This sliding pushes each part against the inside of the steerer tube and holds the stem in place.

fujidon

I think this stem can still be used. Just clean up the outer edges and the face where the wedge slides against the stem. It may be a bit of work because the stem is probably steel. If it's aluminum, it will be a bit easier. Be sure to use plenty of lube (I just use ordinary grease) when you reassemble.

SurferRosa

You can do it with an iron file. Check out the cheap ones that harborfreight sells. They work.

dedhed

Looks like an alloy stem. Take it out to the concrete sidewalk and use that for the rough "sanding" then finish off with sandpaper/emery cloth for the final clean up.

ClydeClydeson

You could take the stem outside and use the sidewalk or a flat stone as an abrasive to remove the burrs.

Geepig

Are you really, really sure that you tightened the bolt instead of loosening it? We all do dumb things at times, but that thread looks like the wedge was recently much further down the bolt.

curbtender

Probably need to cut off about a quarter inch at least to make it useable. Chop saw with abrasive blade or a grinder. Or just find a replacement and install correctly.

masonv45

I wouldn't say it's backwards - more like 180° out of place. PO installed it incorrectly.

Mr. 66

I'm wondering if the stem, with the length of bolt there, has been cut down.

bicyclepost

Alright so I sanded it down with some 60 grit sandpaper but the wedge and stem end don't have the same angle. I put the bolt in the stem and the wedge on the end and tightened it up outside of the headtube to see what would happen and it works ok but it seems like it might twist around and go backwards again like it was in my original post if I'm not careful. Also, the stem itself barely fits in the head tube. I did some sanding around it to thin it out but I still have to apply some pressure and wiggle it to fit it in despite the stem measuring ~21 mm and the head tube ~22.2 mm (with a tape measure, I don't have caliper's). Is this worth saving or should I just get a new stem? Thanks everyone for your responses, much appreciated!

Pop N Wood

Looks pretty good. Shouldn't be hard to sand a little more and get the angles to match.

Are you greasing everything when you put it back together? Check your headset and make sure it isn't torn up from the last go around.

As long as the stem is seated well inside the headset your should be OK. I think the only way to get what you had would be to insert it incorrectly from the get go.

SkinGriz

This might not have helped in this situation, so take following instructions with a grain of salt.

Here’s what I do with quill stems.

1) Hose it all down with penetrating oil. Let sit for a couple days. Might even be worth it to flip bike upside down spray penetrating oil from other side. Charcoal lighter fluid makes a passable penetrating oil if you don’t have any.

2) Turn the bolt on top counterclockwise maybe 3 rotations. The bolt that goes through the wedge.

3) Strike that bolt down pretty hard and fast with a hammer.

4) Strike the quill stem down. Everything should now be freed up. If the quill stem is hard up against the bearing lock nut, maybe don’t strike it.

5) Grip front wheel with your legs and wiggle the handlebars back and forth while pulling them up. Should slide right out.

These steps won’t work if the previous owner messed things up, or if the aluminum stem corroded to the steel fork tube.

These steps work good for generically old rusty parts.

It should be like a 3 minute job.

sovende

In general, a reasonable solution for a rusty/stuck stem quill. I’m sure many cringed at the “flip bike upside down” suggestion (without further qualifications)! I rarely (if ever) do so but the times I have, I always placed the mid section of the handlebar on a block of wood tall enough to prevent the brake cables from being kinked and/or to prevent damage to the brake levers! I also place a pad of some sort underneath the saddle to prevent scuffing or any other damage.

sovende

The first and second pic in the OP seem to show that (in addition to the wedge being 180 degrees out of position) the wedge has been pulled into the stem quill and has flared it out a bit. I know it’s beyond the capabilities (tool wise) of the OP but I would definitely (as suggested in another reply) trim a bit of length from the quill to get rid of the flare and to correct the mating angle with the wedge.
The “field expedient” method of using a concrete sidewalk to remove some of the damage on the quill came immediately to mind for me too! SurferRosa’s suggestion (an iron file from HarborFreight) is a bit more elegant tho. Unfortunately, no HarborFreight stores in Canada (plus there it would be HarboUr Freight)! I believe the Canadian equivalent is Princess Auto

J.Higgins 

Somewhat OT, but one thing I'd like to comment on is that a couple weeks ago, I removed a stubborn quill stem from an old school Marin MTB. It just didn't want to "act right" as I would remove it similar to what you've described above, but it just didn't want to come out. It took quite a lot of taping on the bolt to free it up, and only then was I able to remove it. Come to find out, the wedge on the end of the stem was made of aluminum! I've never seen that before. The wedge had corroded and welded itself to the inside of the steerer tube. I cleaned it out and greased everything up and it slid back in like butter. Weird though. That particular Marin model wasn't notable for being lightweight or particularly high-end, so why the effort to save weight on that particular component?

SkinGriz

Maybe they just ordered in bulk and it was the part on hand.

dabac

Considering the poorly fitting angle, and the excessive amount of threads showing I think you’re looking at a Frankenstem, assembled from parts of other stems. While it’s probabliy possible to make the parts fit, you may want to consider another stem.