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does bent derailleur = replacement ?(6 posts)

does bent derailleur = replacement ?RojoRacer
Mar 20, 2002 3:59 PM
This morning I had a fall on the bike (2 months old!!) and the damage was:
-bent rear derailleur, it's bent pretty bad towards the wheel, but not hitting the spokes
-bent handlebar

My question to all you mechanically minded people is: does a bent rear derailleur mean I have to replace it or will an LBS attempt to straighten it out... ?


re: does bent derailleur = replacement ?weiwentg
Mar 20, 2002 4:42 PM
happened to me. probably your derailleur hangar, and not the derailleur itself, was bent. if it's steel, the LBS can straighten it. if it's aluminium, they can do that too ... but it will break. anyway, they're not expensive to replace.
Derailleur or hanger?Kerry
Mar 20, 2002 4:44 PM
Are you sure it is the derailleur, and not the dropout derailleur hanger? If it's a steel bike and it's the hanger, it most likely can be straightened. If it's an Al or CF bike, hopefully the hanger is replaceable, as an Al hanger that's been bent (and bent back) is not too reliable. If the derailleur is truly bent, it still might be something that can be straightened, depending on what is bent. The standard technique for straightening a derailleur is to slip the jaws of an adjustable wrench over the pulley cage and tweak it back into position. Since the derailleur is aluminium, it may not survive the straightening process, and you should be checking carefully for cracks and strain marks. Look at it this way - you've got nothing to lose. If you can salvage the derailleur, great. If you can't, you aren't out much for the effort.
Probably bothgrzy
Mar 20, 2002 5:09 PM
Arm chair logic says that you should just fail the weakest link - however as the forces shift and things become work hardened it's not so simple. I never seem to be able to bend just one and not the other when I wreck. Got a small collection of rear der. that aren't quite straight and own the Park DAG-1 alignment tool. It's always worth trying to straighten things, but don't be surprised if it doesn't work quite right or breaks. As Kerry said, you've got nothing to lose by trying.

Anyone wanna buy a slightly twisted rear der.?
re: does bent derailleur = replacement ?RojoRacer
Mar 20, 2002 6:08 PM
Thanks for the replies..

I just went downstairs to look at it again .. (and cry some).. it DOES appera as though it's the hanger and the derailleur as well... I'm leaving work early so I can take it to LBS. BTW, bike is 853..

it still sucks though... I woke up this morning, it was raining. I didn't have my beater because that was getting repaired from a previous accident, so I thought I'd take my new one out.. and then in the last 5 minutes of a 2 hr ride, jaywalker runs out "from nowhere" and I try to avoid him - have to avoid some tram tracks (I live in Melbourne, Oz) and don't quite make it, so I'm sliding on wet tram tracks - gritting teeth - and bang, I'm on the floor - the guy is nowhere to be seen.. no one around to id him. Bastard.
Mar 21, 2002 7:15 PM
Next time nail the SOB - he'll break your fall and he won't get away. ;-)

Your LBS should be able to fix you up with a minimum of hassle - steel bends back more succesfully than aluminum. Your rear der may work OK for a while if you need to get a new one.

I'd say there is a message in there somewhere: when I have too many close calls or accidents I take it as a sign that I'm riding too agressively for my surroundings. You have to make the decision to back off a notch or continue crashing. You have to admitt that the guy probably wasn't trying to make you crash.