So couple days back I unmounted the rear wheel to fit the bike into my car, I only assembled it back today to go for a ride and then this happens, rear derailleur not shifting back staying stretched and the chain becoming very loose. What should i do to fix it ? Thanks!
Rear derailleur not moving properly ?
byu/Savings_Treacle_7330 inbikewrench
by Savings_Treacle_7330
14 Comments
Chain is too long.
That chain is miles to long
Derailleur looks like it has no tensionÂ
Is this a joke?
The heck with the chain length?
Chain lenght is ok, dr cage dont sprung back
Guys the chain length is not the main issue here at all or even issue. The derailleur cage is not returning to position after being pulled forward by going to a larger sprocket. And thus when they shift to a smaller sprocket the chain appears long or slack.
OP: your derailleur cage return spring is either broken or the spring tap bent and slipped from position. for a experienced tech this is easy to diagnose and maybe event fix if parts are not damaged. remove chain and then removed the derailleur cage from the main parallelogram, Check the spring, It could also be the main pin holding the cage to the derailleur body being dirty and corroded not letting the cage move free. when taking the cage off you be removing pin anyway and clean and polish it with steel wool.
If you do not know how to do the thing i described take to a shop.
why does your chain so loose?
OP got that 300 link chain
No tension on derailleur. It’s stuck somehow. Chain too long and ffs people stop tuning your bice upside down while your wife’s boyfriend turns the pedals
If its a SRAM derailleur, you may have activated the cage lock? Any way chain is way too long.
Derailleur is not mounted on the gear hanger correctly. Remove and refit
This has nothing to do with chain length. Your derailleur arm is not tensioning the chain properly. I would make sure you didn’t hit a switch on it locking it in position. Some derailleurs have clutch switches that could of locked it in place.Â
There usually is a button you push to KEEP the derailleur in this position to work on the chain or remove the wheel. Take a closer look if it is engaged. Usually by pulling the derailleur a bit towards the front of the bike will disengage the button and the derailleur will work fine.