Cassette & chainrings

[jps71]

Hi guys

A couple of questions.
I have recently fitted a new chain which is starting to jump under load.
So I figure I need a new rear cassette.
could some one please look at the attached photos and tell me.
A/ is the cassette worn out.
B/ are the chain rings ok.
C/ the bike is fitted with a sram rear deralleur so do I need a sram cassette or will any 8 speed cassette do.
D/ finally is it a cassette or a screw on freewheel hub

Hope some on can help.
Cheers Jim

 

[Joffey]

Could do with a clean...

 

[Tim Hall]

It's hard to tell from the pictures whether the cassette is worn, but the symptoms, especially after fitting a new chain, say that it is the cause. Check for a tight link in the chain as well though, just to be sure.

I'd not change the chain rings just yet - they look to have plenty of length left on the teeth. Of course, if it still skips, then change them too.

In my experience a Shimano 8 speed works perfectly with a SRAM 8 speed mech. The spacing is the same.

I can't tell from the picture whether it's a cassette or a freewheel, although my guess is a cassette. A picture with the wheel out of the frame, looking straight on to the cassette/freewheel will help.

 

[jps71]

Hi Tim

Thanks for the reply.
I have checked the chain & can find no tight links.
I have attached a couple of photos of the wheel removed.

Cheers Jim

 

[steve50]

Thats a cassette

 

[Milkfloat]

Thats a cassette

A worn one.

 

[Tim Hall]

As the others say, it's a cassette. You'll need a cassette removal tool (Shimano pattern fits SRAM) and a chainwhip.

 

[jps71]

Cheers Guys.

Thanks for all of the replies
Guess its time to buy a new cassette.
Does it have to be a sram cassette or will any 8 speed do.

cheers Jim

 

[migrantwing]

Clean the cassette first off, then post new pics. Hard to tell being so dirty, but it looks like the cassette is worn.

As has been said, any 8 speed cassette will do, depending on what gearing you want.

 

[Andywinds]

In my limited knowledge of cassettes and on the basis that I changed one, that needs to be replaced.

 

[jps71]

Cleaned it as best I can at the moment.
Looks pretty worn to me.
Here's the photos.

 

[steve50]

A lot of the teeth on the two largest sprockets have shark fins, they are totally worn out. depending on whether your bike is a hybrid or drop handle road bike you want to get either a cassette with high gear for the hybrid or standard road gearing.
the second link is for an Sram the same as you have now.
Hybrid, http://www.ebay.co.uk/itm/Shimano-A...e-Sprockets-/291431673135?hash=item43daae6d2f

Road bike, http://www.ebay.co.uk/itm/SRAM-Cass...sette-12-23-/401008803484?hash=item5d5dfcbe9c

 

[jps71]

Hi Steve

Thanks for the reply.
It is a carrera vulcan mountain bike.

Cheers Jim

 

[LetMeEatCake]

If you want to keep exactly the same gearing, I think you're after an 11-32 cassette.

 

[migrantwing]

Your style of riding should reflect in your cassette. Road or everyday riding, you wont need a 32t. If your going off-road and cycling up steep 'off the beaten track' areas, then a 32t will help.