Bicycle Mechanics - Derailleur Hanger on old Road Bike - How to install.
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So I have an old steel road bike. It has the derailleur tab that has a slot to match the dropout slot. Are they designed so that anytime you remove the wheel, the DR will fall off? It seems odd, but there's no way I can see to affix it. It appears to be held on entirely by the skewer. Is that right? If not, how ?
08-25-11, 09:23 AM
Are you talking about an adapter claw like this? http://sheldonbrown.com/harris/derailers-rear.html#hanger
It should have a bolt that holds it in place.
08-25-11, 09:37 AM
Some may have been designed with a longer slot but no bolt, in which case you would need axle stops.
Look at the little pieces here. This seller on ebay wants $10, but you could probably get some for less or free at your LBS or co-op
Thanks for the responses. Yes lostarchitect, it looks exactly like that. So, there should be a bold through the hanger that threads into a nut which locks it in place in the hanger. That bolt and nut were missing on the original bike as I found it. It had a non-quick release and the nuts on the axle were just tightened down to hold the hanger in place. It worked unless you ever needed to remove the wheel.
That means the other side has to be adjusted such that the wheel doesn't slide all the way back to the end of the hanger with the stops in the pic from ex pres?
Looks like I'll need to go in search of a few replacement parts. The other old steel framed road bike I have was exactly the same - missing the nut/bolt and stop for the other side.
I wonder why they built them that way. Seems complicated when it could be pretty simple. And it leaves a lot parts that could shift and misalign the rear wheel.
08-25-11, 10:20 AM
They built them for cheaper derailleurs that had an integrated claw in the hanger, and a bolt that screwed into the eyelet in the top of the dropout.
Yes, you will have to set it up so the wheel is evenly seated in the dropouts. The claw itself is cheap so you might just want to go ahead and buy a new one.
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