Chain Comes off

[Downward]

My chain comes off a lot maybe once every 5 miles when I am changing the front gears.

Tonight it did it and threw all the gears out so I had to plod on home with my gears rattling and changing up and down.

 

[rich p]

Does it come off on the inside or outside? There are 2 limiting screws on the front derailleur which stop the chain going too far either way. You need to adjust at least one of them.

 

[Downward]

Does it come off on the inside or outside? There are 2 limiting screws on the front derailleur which stop the chain going too far either way. You need to adjust at least one of them.

Inside - I adjusted it as it wouldn't go on the biggest ring. Could do with a chain catch or somthing

 

[johnsie]

Could be the same problem I had, the large and small rings were not quite bolted together as snug as they could be, and there was the equivalent of a wheel buckle in the large ring - every so often pushing the chain from one ring to the other would coincide with the "buckle", thus going too far and dropping off - any help?

 

[rich p]

Inside - I adjusted it as it wouldn't go on the biggest ring. Could do with a chain catch or somthing

You need to adjust the screws to limit the derailleur movement. The lower limit screw won't affect the upper limit and vice versa.

This may help but there are others.

View: http://www.youtube.com/watch?v=ngm6dr-1na0

 

[Globalti]

Make sure your chainrings are not loose.

If it's dropping off the inner chainring, consider the length of the chain. I had this problem recently and I got lots of advice on here but in the end shortening the chin by 2 links almost resolved the problem.

 

[tyred]

Check for bent chainrings.

 

[02GF74]

check that the derailluer cage is parallel to the chain rings - it can be knocked out of line quite easily.

 

[cyberknight]

And it is set the right height above the chain ring , i had this same problem and cured it by dropping the mech till it was a coins width above the chain on the upper chain ring




http://bicycletutor.com/adjust-front-derailer/