Chain slipping

Nemanrio

Hi guys,

Hope I'm posting this in the right section.

Whilst riding in certain gears, the chain keeps slipping between one ring and another ring (the back one).

What could be causing this?

Thank you in advance.

Pinch Flat

Nemanrio wrote: »

Hi guys,

Hope I'm posting this in the right section.

Whilst riding in certain gears, the chain keeps slipping between one ring and another ring (the back one).

What could be causing this?

Thank you in advance.

Cold be a number of issues - maybe an incorrectly indexed derailleur (easy fix) Or a worn chain and / or cassette. How old is it?

Nemanrio

Pinch Flat wrote: »

Cold be a number of issues - maybe an incorrectly indexed derailleur (easy fix) Or a worn chain and / or cassette. How old is it?

Thanks for the reply Pinch.

The bike is 5-6 years.

Pinch Flat

Nemanrio wrote: »

5-6 years.

Assuming it has high mileage on it, I'd replace the chain and cassette.

Nemanrio

Pinch Flat wrote: »

Assuming it has high mileage on it, I'd replace the chain and cassette.

Chain was replaced, so I am assuming cassette or derailleur

Pinch Flat

Nemanrio wrote: »

Chain was replaced, so I am assuming cassette or derailleur

Some posters disagree, but I replace my chain and cassette together. You can also consider rotating chains and prolong the life of the cassette until you've worn the cassette out completely. But more for the DIY bike maintainer.

Hoe often is the chain cleaned? A well maintained chain will last longer (and not wear out other parts).

You could give derailleur adjustment a go - it may be that the tension is slightly off which would cause it to skip. Sheldon Brown a fountain of knowledge for all things bike related:

http://sheldonbrown.com/derailer-adjustment.html

Nemanrio

Pinch Flat wrote: »

Some posters disagree, but I replace my chain and cassette together. You can also consider rotating chains and prolong the life of the cassette until you've worn the cassette out completely. But more for the DIY bike maintainer.

Hoe often is the chain cleaned? A well maintained chain will last longer (and not wear out other parts).

You could give derailleur adjustment a go - it may be that the tension is slightly off which would cause it to skip. Sheldon Brown a fountain of knowledge for all things bike related:

http://sheldonbrown.com/derailer-adjustment.html

About once per month.

Wishbone Ash

Nemanrio wrote: »

About once per month.

Better to express that in kms - one a month for some is 2,000kms, for others it may only be 200kms.

Carawaystick

Look at the teeth on the cassette & chainring.
If they're sharkfin shaped, then you need to replace them
see the middle ring esecially, but the big ring too
http://bicycles.stackexchange.com/questions/429/does-this-chainring-need-to-be-replaced

as an exmple of sharkfinning. Both your cassette and chainrings may be affected

Nemanrio

Wishbone Ash wrote: »

Better to express that in kms - one a month for some is 2,000kms, for others it may only be 200kms.

Closer to 200km.

Nemanrio

Went to bike shop. They said the hanger (not sure what that is) needed replacing for €15.

They recommended that I change derailleur . Ordered one from chain reaction for 25 quid.

Pinch Flat

The hanger is the little hooked shaped piece that attaches you derailleur to your bike - bit like this

http://store.khsbicycles.com/wp-content/uploads/wpsc/category_images/derailleur-hanger-277.jpg

It is quite vulnerable to damage - did it myself - and is designed to snap to prevent the derailleur being damaged in a fall / crash. 15 quid is reasonable to replace this. Might be that the derailleurs is bent as well.

Nemanrio

Pinch Flat wrote: »

The hanger is the little hooked shaped piece that attaches you derailleur to your bike - bit like this

http://store.khsbicycles.com/wp-content/uploads/wpsc/category_images/derailleur-hanger-277.jpg

It is quite vulnerable to damage - did it myself - and is designed to snap to prevent the derailleur being damaged in a fall / crash. 15 quid is reasonable to replace this. Might be that the derailleurs is bent as well.

Ya, you're bang on tbf.

He straightened the derailleur as much as he can without snapping it.

The derailleur and idler lower pulley aren't lining up perfectly so he suggested a new one.

Pinch Flat

Ah fair enough, replace the derailleur then and it looks like you're good to go.