Help - changed cassette and chain - but not working

[summerdays]

i changed the cassette and chain today but had to abandon it before it was complete. Now I'm checking all is fine, and it's not.

Symptoms: pedals turn when I'm pushing the bike, and the chain is not flowing properly.

I could do with sorting this tonight else it's the bus for me tomorrow!

 

[summerdays]

Chain looks a little short .. Big big ring combo, but I made the chain the same length as previously and I've checked both old and new cassette max is 34 teeth.

 

[potsy]

Have you threaded the chain correctly through the derailleur?

 

[summerdays]

Have you threaded the chain correctly through the derailleur?

I thought so but it is the sort of thing I could get wrong!

 

[potsy]

I thought so but it is the sort of thing I could get wrong!

I would compare it to another bike if you have one handy

 

[Crackle]

I can't tell from the picture but I'm suspicious. Is the chain inside the guard on the upper jockey i.e. it's running on the jockey and not across the cage.

 

[wisdom]

As above.Also is thechain the same length as the old one it does look very tight.

 

[summerdays]

Have you got a tight link where you joined the chain? (ignore this if you are using a power link). If you take the rear wheel out, does the cassette 'freewheel' when you turn it (backwards) by hand?

In answering that last point... It doesn't freewheel...

So Mr Summerdays suggested putting the old cassette back on with the new chain and it seems to be working fine in that combo.

So the old cassette was a SRAM PG980, and the new one was going to be a Shimano XT Deore, I had decided to try Shimano... I thought they were interchangeable? Mr Summerdays is suggesting it looks like it needs a spacer to move it away from the wheel?

 

[Deleted member 1258]

In answering that last point... It doesn't freewheel...

So Mr Summerdays suggested putting the old cassette back on with the new chain and it seems to be working fine in that combo.

So the old cassette was a SRAM PG980, and the new one was going to be a Shimano XT Deore, I had decided to try Shimano... I thought they were interchangeable? Mr Summerdays is suggesting it looks like it needs a spacer to move it away from the wheel?

Silly questions time, have you got the right cassette? Every where I look its telling me that the PG980 is a 9 speed and the XT Deore is a 10 speed?


Edit I've found a Deore in 9 speed Deore XT CS-M770 9 speed

 

[summerdays]

Silly questions time, have you got the right cassette? Every where I look its telling me that the PG980 is a 9 speed and the XT Deore is a 10 speed?


Edit I've found a Deore in 9 speed Deore XT CS-M770 9 speed

Yep that's the one!

 

[User33236]

In answering that last point... It doesn't freewheel...

So Mr Summerdays suggested putting the old cassette back on with the new chain and it seems to be working fine in that combo.

So the old cassette was a SRAM PG980, and the new one was going to be a Shimano XT Deore, I had decided to try Shimano... I thought they were interchangeable? Mr Summerdays is suggesting it looks like it needs a spacer to move it away from the wheel?

I had that problem when I replaced a cassette some time ago and missed a spacer from behind it. Are you sure all the required spacers are on behind the cassette?

Don't know about SRAM but at one point (again don't know if it's still the case) Shimano Tiagra didn't require a spacer due to some 'bumps' on the rear of the cassette which 105 didn't have.

 

[Deleted member 1258]

I had that problem when I replaced a cassette some time ago and missed a spacer from behind it. Are you sure all the required spacers are on behind the cassette?

Don't know about SRAM but at one point (again don't know if it's still the case) Shimano Tiagra didn't require a spacer due to some 'bumps' on the rear of the cassette which 105 didn't have.

Thats still the same with Tiagra, I have 10 speed Tiagra and it doesn't need a spacer behind it, I believe its held together with rivets and its the rivet heads behind the cassette that means it doesn't need a spacer.

 

[wisdom]

Glad your sorted.No bus tomorrow.

 

[Deleted member 1258]

Yep that's the one!

I think you need to look at whether it needs a spacer behind the cassette or not, and look at the chain length.

 

[hopless500]

View attachment 127749 Chain looks a little short .. Big big ring combo, but I made the chain the same length as previously and I've checked both old and new cassette max is 34 teeth.

Dunno whether it helps but Mr Hop thinks the chain looks short and derailleur not lined up right, but he said hard to tell from the photo