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New derailleur hanger not perfect

Old 03-07-18, 04:26 PM
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Kbfore1
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New derailleur hanger not perfect

I recently had a new RD hanger put on my cannondale synapse. The new dropout is a little deeper than the one on the left so the tire does not fit straight when the axles are both all the way in the dropouts. Yes a wreck caused a slight bit of bend in the original RD and electronic shifting I recently had installed would not run perfect. The wheel does not need dishing and frame Is fine. The shop checked all that out for me.
So now I have to tighten the quick release a little off center to get the wheel center. Does this make sense?

Just wondering if it isn’t bad not to have the QR not against the dropout on one side.
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Old 03-07-18, 04:56 PM
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In the case of a solid axle with a nut it is normal for the axle to be midway. So this should not be a problem, just a nuisance. Historically there had been some contraptions for there grabbing the axle, so you might consider patching up something along those lines, see the Sheldon Brown's page, for good positioning.
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Old 03-07-18, 05:11 PM
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With the vintage horizontal droputs, one would center the wheel as part of installing the wheel, but the axle would always rest on the top of the dropout.

If you have a space (or radius) above the axle, then I would think there is a risk of a bump causing the axle to shift, as well as bending the QR spindle.

Is your replacement derailleur hanger a Cannondale OEM hanger, or is it a generic you bought off of the internet?

If it was me, I'd probably take a file and carefully adjust the new hanger while trying not to damage the frame.

Or, if your original hanger isn't too badly bent, I'd first try to repair that one.
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Old 03-07-18, 05:15 PM
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Oh, one might note that the Shimano/Vintage style internal cam QR skewers have a reputation for being able to be tightened better than the external cam skewers that are increasing in popularity with some brands now.

I did try an external cam skewer on a horizontal dropout once (with very tight tire clearance). It would only work if I would pull the Drive side of the skewer back slightly before tightening.

In your case, you could go with the internal cam skewers, and perhaps also pull the skewer spindle tight against the part of the axle you wish to hold in place.

Anyway, it might work, but I'd still go for the solution of getting a better derailleur hanger, or gently filing yours to fit properly.
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Old 03-07-18, 06:01 PM
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Rd

Originally Posted by CliffordK View Post
With the vintage horizontal droputs, one would center the wheel as part of installing the wheel, but the axle would always rest on the top of the dropout.

If you have a space (or radius) above the axle, then I would think there is a risk of a bump causing the axle to shift, as well as bending the QR spindle.

Is your replacement derailleur hanger a Cannondale OEM hanger, or is it a generic you bought off of the internet?

If it was me, I'd probably take a file and carefully adjust the new hanger while trying not to damage the frame.

Or, if your original hanger isn't too badly bent, I'd first try to repair that one.
The new RD was bought by the cannondale shop. It has the S on it so it is real.

How would I adjust the new hanger? It is deeper than the one on the other side?
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Old 03-07-18, 06:03 PM
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Originally Posted by CliffordK View Post
Anyway, it might work, but I'd still go for the solution of getting a better derailleur hanger, or gently filing yours to fit properly.
I would have to file the non drive side right?
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Old 03-07-18, 06:09 PM
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Mmmm... maybe some photos (advanced editor, and paper clip icon )

I had assumed you meant the new derailleur hanger descended further than the original, and thus the filing would only be on the derailleur hanger (which is replaceable if you mess up).

You can file the dropouts on the bike, but that is dangerous to do, as you could get it wrong if you're not careful.

If you bought the part at the shop, you could also go back to your shop and ask them to get it right. Hopefully you can get an experienced "mechanic" to do the mod.

Of course, also before filing any dropouts, double check the alignment on the frame and dishing of the wheel.
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Old 03-07-18, 06:12 PM
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Originally Posted by CliffordK View Post
Mmmm... maybe some photos

I had assumed you meant the new derailleur hanger descended further than the original, and thus the filing would only be on the derailleur hanger (which is replaceable if you mess up).

You can file the dropouts on the bike, but that is dangerous to do, as you could get it wrong if you're not careful.

If you bought the part at the shop, you could also go back to your shop and ask them to get it right. Hopefully you can get an experienced "mechanic" to do the mod.

Of course, also before filing any dropouts, double check the alignment on the frame and dishing of the wheel.
You really couldn't tell anything from a pic. It is too small.

You are right about taking it back. I was trying to make sure I wasn't wasting a trip. They are a good shop. Thanks.
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Old 03-07-18, 06:15 PM
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Originally Posted by Kbfore1 View Post
I would have to file the non drive side right?
I would not. Maybe make some careful measurements with the wheel in the correct position and add a shim -- like a crescent or gauge pin(s) epoxied in place. Easily reversible.
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Old 03-08-18, 07:40 PM
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Originally Posted by AnkleWork View Post
I would not. Maybe make some careful measurements with the wheel in the correct position and add a shim -- like a crescent or gauge pin(s) epoxied in place. Easily reversible.
I am not sure what those things are. Is there a pic online of a shim?
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