Bicycle Mechanics - Bent Deraileur Hanger

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transient
08-02-02, 09:20 PM
Is there anything that can be done with a bent (non replacable) deraileur hanger, or is it time to get a new frame at that point? I know I can bend it back, I just don't know if it will stay there. This isn't my bike, and my friend (who's buying it from me) can probably deal with it the way it is, but if there was something I could use to reinforce it or something, that would be great.

TIA

pokey
08-02-02, 09:26 PM
Depends on the dropout material.Some take to bending better than others and it also depends on how bad it's bent.Don't feel like guessing or making assumptions.Shiffting typically goes in the toilet if they are bent.Is this guy really your friend?
transient
08-02-02, 09:28 PM
mmm... it's an older GT agressor, i'm guessing it's aluminum, but i'm not sure.

Hunter
08-02-02, 09:32 PM
Most of todays frames with a non replaceable hanger can be manipulated to a point. You need a der. hanger alignment tool to get it correct. Take the thing to a LBSto get it done. It should not take that long or cost to much. Yes a GT agressor was an Alu. frame.
transient
08-02-02, 09:44 PM
Sweet, thanks for the info. I feel much better selling the bike now :)
pat5319
08-02-02, 11:43 PM
The hanger can be bent back but, alumninum loses a LOT of strength when it is bent. If it is bent again, (and again), at some point a removable hanger may/will have to be retro-fitted. Yes, a good shop can do it. I installed a few myself when I wrenched for one of the largest GT dealers.

Ride Straight Again
Pat
transient
08-02-02, 11:49 PM
Hmmm, so you can retrofit a removable hanger? How much would that run, and how is it done?
pat5319
08-03-02, 12:01 AM
There is a kit ( or used to be ) that can be ordered by a shop. The old hanger is cut away and a portion (slot in the side) of the drop out is cut away as well and the replacable hanger is bolted on. The finshed product does have similar apperance to a stock replacable unit.

As for cost- I can't recall wow much we charged, my guess would be $20 to $30 labor plus parts

Ride and Ride Some More
Pat
transient
08-03-02, 12:06 AM
Wow, that's not bad at all. Thanks a bunch!
Calvin Jones
08-03-02, 06:49 AM
The derailleur hanger typically sees very little stress from actually riding and shifting. It gets bent and stressed from impacts. You have nothing to lose in trying to have it re-aligned. The stress of riding and shifting is on the chain and cogs, not the derailleur or hanger.

A good shop can do this for you. See the process at

Derailleur Hanger Alignment (http://www.parktool.com/repair_help/DAG.shtml)


http://www.parktool.com/images/repair_help/DAG03.jpg