Why is my chain skipping in the 12t sprocket?

[C R]

Most of the Shimano ones I’ve fitted are.

I am curious about the mechanism that makes them directional.

 

[Webbo2]

I am curious about the mechanism that makes them directional.

When I open the box and get the leaflet out, it tells me that the Shimano logo should be on the outside and the quick link has markings that go one way.

 

[C R]

When I open the box and get the leaflet out, it tells me that the Shimano logo should be on the outside and the quick link has markings that go one way.

Yes, that's the mechanism by which they show which way it is supposed to be mounted. What I am asking is what makes the chain behave differently if you put it the wrong way. What particular feature of the mechanical design of the chain causes it to behave differently depending on its orientation.

 

[Webbo2]

Yes, that's the mechanism by which they show which way it is supposed to be mounted. What I am asking is what makes the chain behave differently if you put it the wrong way. What particular feature of the mechanical design of the chain causes it to behave differently depending on its orientation.

I guess if you can’t see the logo it won’t work as well.😉

 

[Vapin' Joe]

Yes, that's the mechanism by which they show which way it is supposed to be mounted. What I am asking is what makes the chain behave differently if you put it the wrong way. What particular feature of the mechanical design of the chain causes it to behave differently depending on its orientation.

The inner plates are a different shape to the outer to make shifting up the cassette easier.

 

[faster]

Was the new cassette fitted at the same time as the new chain?

The reason I ask is that if you'd run the new cassette with the old chain, it's probably already worn out.

It only takes a few miles.

The other way round (new chain with an old cassette) is fine, but old chain on a new cassette will very quickly destroy it.

 

[Illaveago]

When I open the box and get the leaflet out, it tells me that the Shimano logo should be on the outside and the quick link has markings that go one way.

So does that restrict you to only fitting Shimano chains?

 

[MontyVeda]

Was the new cassette fitted at the same time as the new chain?

...

it was.

 

[Pentti]

possibly.... that's the screw that i honestly don't know what its function is. I know what it does, i'm just not sure why but I'll look into it. Thanks

On the smallest cog the chain can become slack (normally due to wear) adjusting the "B" screw allows the derallieur to re-tension the chain and take up the slack. Not so obvious when the bike is upside down.