cassette replacement (i think)

cycling_simon

Hi

a month or so ago my chain snapped whilst out on a ride so i decided it simply needed to be upgraded.

I got a sram chain of ebay, but have the problem of the chain slipping. it generally only happens when i am in the very smallest ring on the back (i think)

I have a hardrock pro and am not that fussed about having the best.

do i just need to get a rear cassete?

what one shall i go for? I was looking on chain reaction and 'Narrow 8-speed IG chains' for the http://www.chainreactioncycles.com/Mode ... elID=23318 .

I am totally confused!

What shall i get.

Please help me

Thanks very much

Simon

cycling_simon

I think these are the ones to chose from...

http://www.chainreactioncycles.com/Sear ... ed+cassete

Ciaran500

Any of those will fit fine, you will also need a chain whip and a one of these if you plan on replacing it yourself. http://www.chainreactioncycles.com/Mode ... delID=7975

zero303

Don't assume yer cassette is dead...

I had a LBS do a service on a bike I got given (had no tools or workshop space at that time), would change properly and chain skipped a lot. I assumed the whole drive chain was shafted but rode on for a few weeks.

Long story short, the chain snapped on a climb and I accidentally pedaled the broken link through the front mech and trashed it. Different LBS did the work, I mentioned that I felt the whole drive chain was shafted as well and needed replacing - turns out it just needed servicing and setting up properly and the other LBS had done a rubbish job.

Your cassette may be ok, just need some drivechain TLC...

GHill

It could well be the problem. If you take a look at the offending ring can you see any wear on the teeth - you're looking for hooks or "shark fins"? Cassettes are held on with a lock ring in the centre, if you take a look on there it may well tell you what model it is.

To replace the cassette you probably need a cassette tool to remove/tighten that lock ring and a chain whip to hold the cassette in place. It might be worth factoring in the cost of those tools, if you need them.

cycling_simon

my friend will be able to do it for me, he works in a bike shop. well I say a bike shop, but i mean Halfords!

I dont think it is the set up, as it was fine before the chain went.

will a bike shop be able to diagnose the problem for me?

cycling_simon

also, was i right to just replace the chain?

GHill

cycling_simon wrote:

also, was i right to just replace the chain?

Yup. Once they've gone once it's best to just replace them.

Ciaran500

cycling_simon wrote:

I dont think it is the set up, as it was fine before the chain went.

will a bike shop be able to diagnose the problem for me?

Chains and cassettes wear together, so by replacing the chain it doesn't fit snuggly onto the cassette like the old one. Have you ever replaced the chain? How long have you had the bike? Did you readjust the gears after you put the new one on?

A good bike shop will be able to tell you whats wrong but if your chain & cassette haven't been replaced in a year+ I'd guess that you need a new cassette.

Anonymous

if you needed to change the chain ( you can only really tell by measuring it) you will probably have needed to change the cassette too.

if the new chain is skipping on the old cassette, it might well be that you need to re-index your gears though so i would do that first.

supersonic

My guess is a worn cassette. As above, they wear together, so the new chain doesnt match the pitch of the old cassette causing it to skip. Though it could be the gears that need adjusting!

If it does, then an old LX 8 speed would be my recommendation. It will work fine with your 8spd SRAM chain.

cycling_simon

got one off ebay, £18 posted

thanks for all your help guys

simon
xxx

cycling_simon

what is the difference between the tool with the pin and without? is it just to guide the tool in?

supersonic

The tool for the cassette? Yes, it does just that, and stops it falling out. If the tool doesnt have one you can put the QR skewer loosely through. If you need to, I never have!