Bicycle Mechanics - Rear dropout axle opening issue
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06-21-08, 06:44 AM
Bike is an 04 LeMond Poprad (853 tubing)--just got it (frame/fork) about a week ago, and was set to build it up this weekend. Overall seems in excellent shape--as in no overt indications of having been crashed (or even raced, for that matter).
The problem I came up against pretty quickly is that the rear hub axle (Phil hub) will not even get started into the axle opening. The offending opening is the hanger/drive side dropout--non drive side opening accepts the axle as pretty as you please.
My metric rule seems to indicate >1mm difference between axle and opening. With a bit of elbow grease, I'd imagine I could file it open.
I guess I'm wondering if this is a relatively common occurence (it isn't in my limited experience), and/or an indicator that the drive-side dropout has been bonked enough somehow to close up the opening a bit (line of sight shows it essentially in-line side-to-side). Thought I would try to get some thoughts or suggestions before I just dive in with a file...
06-21-08, 06:48 AM
Have you tried any other hubs, to see if they fit? Just wondering what the previous owner did...
06-21-08, 07:12 AM
Yes--an old Campy Record rear hub (wrong spacing, of course). Same problem. I also flipped the Phil hub--the cassette side fit right in the non drive side dropout, but the QR axle end still would not go into the hanger side.
How it got this way is a bit puzzling because you can see the indentations (the QR teeth marks, if you will) on the dropout from a wheel having been on before. It was packed up pretty well, but maybe got a blow during shipping? I dunno...
06-21-08, 07:20 AM
Is it just excess paint in the dropout area or is it actually deformed to form a smaller diameter?
06-21-08, 07:32 AM
Pretty sure it's not paint (classic misuse of screwdriver/rubber mallet to see if the axle would "tap" on in). It's not really that much, but it actually seems to be slightly deformed inward at the opening.
I'm sure it can be filed, of course, but it would be a bit more than just knocking off a burr.
06-21-08, 10:37 AM
It got bent. Bend it back. :rolleyes:
06-21-08, 10:58 AM
It got bent. Bend it back. :rolleyes:
Now why didn't I think of that?! :bang:
Actually one of the local shops (pestering you good folks didn't seem nearly sufficient :D ) has their head mech on tomorrow (Sunday) and they have the stuff on hand to check it out alignment-wise. Worth doing given that something is clearly amiss, I guess.
06-21-08, 11:12 AM
It sure sounds like the hanger got a bang on it during shipping or other handling. Bending it back would be the right thing to do since the hole for the derailleur will then be in the right place. Otherwise a 1mm closure of the axle opening would indicate a 3 mm or more displacement of the derailleur mount hole. And that sort of distortion WOULD affect your shifting. Filing out the dropout may let the axle fit but it wouldn't do anything for the hanger being out of place.
06-21-08, 11:47 AM
Hmm, OK. Thanks. That's two good reasons not to do extensive filing (the first being the wheel itself spinning off-line). When I get back home I may put a couple of strokes onto the very opening itself to make sure there isn't just a bit of a "hump" in the opening (though not in the part where the axle actually gets seated), but failing a miraculous fix there I'll see what the instrumentation verdict is.
Ugh--hope I don't have to get the dropout replaced...
06-22-08, 12:54 PM
UPDATE: yeah, "bend it back," was it. The guy at the shop was very cool--took a look right away, and asked me how adventurous I felt. :twitchy:
On the stand with me holding the fork and triangle, he took a long pair of channel locks and bent the hanger straight backwards--three tries got an axle to drop in. He then checked the rear dropouts' alignment to each other (just a fuzz off), and then the hanger alignment with a wheel in place (little bit of a twist).
Best 10 bucks I've spent in a long time, I think. I gave him my thanks then and there, of course, but thanks as well to you guys who were nice enough to take notice. :thumb:
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