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anyone ever have a rear derailleur explode?(6 posts)

anyone ever have a rear derailleur explode?slow-ron
Jul 7, 2002 6:09 PM
I now know the reason for a replaceable rear derailleur hanger.

I was 25 miles into a ride a few days ago and mashing up a steep hill in granny gears when I heard "ping", and the cranks just stopped. I looked back and the body of the derailleur split in half. The damage was incredible. Bent hanger, ruined the chain, bent a cog tooth, lodged the chain into the spokes and boogered the wheel. I had a terrible time getting home after converting the thing to a single speed.

The part only had about 500 miles on it. Anyone ever had this happen, know why it happens, and if I can prevent it from happening again?

Major pain and expense to get the bike going again but I took her for a spin around the block tonight.

I know why.High Gear
Jul 8, 2002 2:12 AM
The shop that put on the new derailleur and or rear wheel never set the stop on the derailleur. What happened is you shifted it into the wheel. This type of thing pisses me off. The same thing happened to a friend of mine. He's big, 250lbs. 6'5". He was on his way home and "bang", locked up the rear, the skid mark was incredible, blew out the rear tire too! I would take it back to the shop and ask them to help cover some, if not all the cost.
Similar problem with 8 speed 105 rear derailleurPaul
Jul 8, 2002 3:37 AM
The return spring went, and bent the hanger, locked up the rear wheel. I switch over to Dura Ace and have never had the problem again. One time I downshifted to my small chainring, and it bent into the frame. This happen while climbing, and I was able to coast over to the side of the road, and lean against a bank.

I got rid of my 105 junk.
You think the springs are different on 105 v D-A? nmmuncher
Jul 8, 2002 4:58 AM
Good question, I would hope so. Have a friend who had thePaul
Jul 8, 2002 5:55 AM
same problem awhile back with the spring going on his 105, another friend had his 105 go, but I forget the problem. Haven't heard about der. problems on Dura Ace. Maybe someone can chime in. Shimano has a history of quality control. Like the early 9 speed Ultegra shifters falling apart. New ones seem to have been corrected such as putting a screw (like Dura Ace), in the cap on the top of the shifter. Early ones were falling off. One guy put a bevel on his Dura Ace SPD-R pedal to help him get out of it better. Other guys unclip to the inside. Rush to market I guess.
Jul 8, 2002 12:23 PM
Sometimes the Shimano pin fails in the chain and the link blows open and splatters the der. when the wide link seizes in the der. Check your chain and see if that link is ok, just for grins.