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Hub wont slide on one side of drop out..? Which is the problem?

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Hub wont slide on one side of drop out..? Which is the problem?

Old 06-10-20, 09:42 AM
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shuru421
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Hub wont slide on one side of drop out..? Which is the problem?

Just did a quick test fit on a frame with a Campagnolo Record 11spd hub and although the NDS slid in as it should into the dropout, the DS dropout would not slide in. It seems to be a bit "narrower", simply wont budge. Ive tried another hub (Mavic 571), and this hub-axle diameter seems smaller and had no issues. So what do I do..? Find another hub that will work? Or work on the drive side drop out somehow, someway? Is there a tool to 'spread' the drop out just a cinch?? I just never had this issue, dont know what is best..help please..
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Old 06-10-20, 09:44 AM
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Flat file to open it up. I would file on the bottom face of the opening. If you file the top it will effectively shorten the seat stay on that side, which might be undesirable.
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Old 06-10-20, 09:51 AM
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shuru421 check that the DO surfaces are parallel. If you have a caliper, measure near the closed end and then at the open end. If there is less at the open end, I would use a crescent wrench set to fit over the bottom part of the DO to open it up. The DO material is relatively soft so it will not take much force to bend it. You will want to keep the adjustment screw in the DO,

IIRC the axle is likely 10mm. If your opening is 10+ opening then there is a different problem.
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Old 06-10-20, 10:55 AM
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+1. the bottom of the DS dropout probably rec'd a bump, slightly closing the mouth of the slot. This is fairly common if the frame is accidentally dropped, as the hanger almost invariably contacts the ground first. Once you open up the mouth, check the alignment of the hanger, as it may also be comprised, which will cause problems with indexed shifting.
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Old 06-10-20, 12:03 PM
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Just to confirm that it's that DS dropout, flip it round and attempt to mount it backward.

Do you have another frame you can attempt to mount this wheel on?
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Old 06-11-20, 08:54 AM
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Thanks for the suggestions. I took it to my lbs and had them take a look, seems like filing it some is probably what we'll end up doing as its just a hair too tight. He'll call me back in a couple days or so, so crossing fingers itll turn out as needed. Left him the 11spd hub as well for testing.

So can filing both top/bottom a hair width of the dropout affect the seatstay negatively? Now makes me want to call and cancel the work..
Ive tried fitting the hub left right, backwards, opposite ends, still no dice. So I decided to get an experienced mechanic to take a look. Its a really precious frame to me, so I didnt want to work on it myself and potentially ruin it.

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Old 06-11-20, 10:58 AM
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shuru421 I can understand your concern. It is sometimes difficult to decide to risk doing it myself or letting someone else screw it up. I always take the responsibility unless I really trust the other person. I don't like the ideal of filing something because it is bent slightly. Bending it back is not a high risk effort IMHO. Especially if it is fractions of a mm.

Read the responses in this thread Is this dropout toast?
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Old 06-11-20, 03:27 PM
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Originally Posted by shuru421 View Post
Ive tried fitting the hub left right, backwards, opposite ends, still no dice.
If it's always the right dropout that's blocking, rather than the problem switching sides as you try different orientations, then that pretty-much narrows it down to the dropout. Presumably that mechanic has a caliper and can measure for a difference between the two dropouts, and compare with other frames. If it's so little a difference that other axles fit, then I'd say it's very unlikely you'll risk anything by having the mechanic file it or bend it out a bit. As we often say here in C&V, it _is_ steel.

Last edited by madpogue; 06-11-20 at 03:35 PM.
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Old 06-12-20, 08:14 AM
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Thanks everyone for your quality input!
Just got the frame/hub back yesterday, and indeed they ended up opening up the dropout a bit rather than filing it entirely. All in all, everything worked out just as I hoped! They made sure all alignments were correct. Time to plan a build!!!!!!!!!
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