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Old 07-12-09, 03:00 PM   #1
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Bent frame hanger

The derailleur hanger, the one that is part of the frame, not replacable, got bent when I skidded out on a sandy road. Now when I shift, it does it, but its delayed kinda. My lbs sort of bent it back but its not perfect, anything to do about it?
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Old 07-12-09, 03:04 PM   #2
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Find another bike-shop! There is a simple tool from the Park Tool Co. called the Derailleur-Alignment-Gauge. It is Park Tool DAG-2. They cost around $60. There is no excuse for a shop not to have one - either from Park or another company. They are simple to use, and the job will be perfect.

Here it is:

http://www.parktool.com/products/det...=48&item=DAG-2

Total cost of repair - no more than $15.
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Old 07-12-09, 03:07 PM   #3
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The derailleur hanger, the one that is part of the frame, not replacable, got bent when I skidded out on a sandy road. Now when I shift, it does it, but its delayed kinda. My lbs sort of bent it back but its not perfect, anything to do about it?
You need to get it bent correctly. The tool for the job is Park's Derailleur Alignment Guide (model DAG-2). Can be had for about $55 shipped.

A shop should be using this (or a similar) tool for re-bending hangers. If they're taking your cash and "sort of bending it" but not bending it right, I might find a new shop.

How much did they charge? If you figure you'll be riding for years and might ding your hanger more than a couple times, that Park tool might save you money in the long run. I just ordered the DAG-2, looking forward to fixing a bike that's had a bent hanger for a while.
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Old 07-12-09, 03:08 PM   #4
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The LBS should have been able to get it pretty near perfect. They have a tool which serves both as a bending bar, and gauge for doing the job precisely. Ask the shop to check their job, they should be able to either get it right or explain why it can't be made better. If it is right and still not shifting well, you might have also dinged the RD slightly in the same crash
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Old 07-12-09, 03:15 PM   #5
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They did it for free - and used one of those. I think they said the guage showed it was straight, or at least very close to it. It obviously isnt. It shifts fine overall except going from 3-2
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Old 07-12-09, 03:27 PM   #6
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They did it for free - and used one of those. I think they said the guage showed it was straight, or at least very close to it. It obviously isnt. It shifts fine overall except going from 3-2
OK, then another possibility: The hanger was bent some before your recent crash, and the shifting was tuned to account for it. After bending the hanger straight, the shifting's a bit off. Play with the barrel adjuster to tune the shifting and you should be OK.
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Old 07-12-09, 03:42 PM   #7
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Some people probably don't use the DAG-2 correctly in shops. For instance: Did they check to see if your back wheel was on straight? A wheel out of adjustment will throw the DAG-2 off.
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Old 07-12-09, 03:46 PM   #8
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What is your frame made of? Aluminum, steel, or Ti?
Ti must be heated to properly bend. If not heated it could snap off.
Aluminum and steel should bend ok.
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Old 07-12-09, 04:10 PM   #9
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I went for it and purchased a DAG-2 some time back. Cost me $60 + shipping. A very useful tool indeed.
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Old 07-12-09, 06:45 PM   #10
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Ron asks a good question. Aluminum hangers are pretty much a lost cause if bent, because they'll be severely weakened or break when bent back. Hopefully, your frame is steel, which is much more "repairable".
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Old 07-12-09, 09:21 PM   #11
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It is steel. And, the wheel is in straight, i was playing around with the adjusting barrel with no luck, which is when I got the hanger checked and "fixed".
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Old 07-13-09, 03:32 AM   #12
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Could be possible that something else was thrown out of whack by whatever incident caused the bent hanger in the first place.
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