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bent hanger- Al bike(8 posts)

bent hanger- Al biketemplecat
Apr 14, 2002 7:48 PM
Got an aluminum bike that got a bent hanger, dunno how it happened.. just one day the shifting was off & I couldn't
adjust it. Took it to the LBS where I bought it and they
bent it back. (there is a nick on the rear derailleur but I don't know where that came from either.. does not look serious enough to have bent the frame...). Only a couple of hundred miles on it. Now when I'm jamming up a hill the rear of the bike creaks and pings like crazy. (Is the bike thus dangerous to ride???)

The LBS sez they'll put on a new hanger. (can small shops do
proper welding?). Is this a fix or is the frame trash?
Are some hangers really made of butter?? Worth pursuing as a warranty issue?

tks
re: bent hanger- Al bikeweiwentg
Apr 15, 2002 4:09 AM
normally i'd bet that the derailleur hangar is replacable: ie it is a separate piece that attaches via allen bolts. what bike is that?
re: bent hanger- Al biketemplecat
Apr 15, 2002 4:36 AM
No allen bolts here, it's pretty welded on.
Wonder how much of a paint touchup will be needed too.
re: bent hanger- Al bikeweiwentg
Apr 15, 2002 6:43 AM
argh... obviously they know much more than i do, but generally bending (cold-setting) aluminium is not safe. good luck...
re: bent hanger- Al bikeRusty Coggs
Apr 15, 2002 7:38 AM
Small shops typically are not set up to do Al welding.A frame builder might not even touch it due to having to re-heat treat the frame. Bent hangers are not warranty issues.Bending Al generally is not recommended either.Your skin, not mine.Ride on....
re: bent hanger- Al bikegttrek
Apr 15, 2002 4:43 PM
Yes you can bend back an aluminum der hanger pending on how much it is bent, take your bike to a bike shop that has a
der gauge and straightener, they can check it prior to bending it back to normal or close to normal position.
Yes this not a warranty issue, most likely the bike was dropped or the chain slipped off the smallest ring in the back while pedaling. Bent der hanger just doesn't happen on its own.
Hanger repair and subsequent useCalvin
Apr 16, 2002 5:29 AM
Hanger repair is possible on aluminum. The stress of riding is not on the hanger, the stress is on the cogs, chain, and dropouts, but not the hanger. Typically, if a hanger survives a repair, it will survive the use.

Your creaking and pinging may not be coming from the hanger. Have someone ride with you to double check.

For more on hanger repair see- http://www.parktool.com/repair_help/DAG.shtml
Try this:Spoke Wrench
Apr 16, 2002 6:42 AM
Turn your cranks backwards and watch the chain as it runs over the bottom derailleur pulley. What you are looking for is a tight or bent chain link. My guess is you bent a chain link when you bent your derailleur hanger. A new chain should make your bike rideable again.