Chain skipping

nitrogen

I am aware several threads exist on this problem (And they have helped to narrow down the issues), but I am hoping I can get some feedback on a specific problem.

New chain, old cassette (10S). The chain slips (Doesn't change gear) when pressure is applied only on small chain ring and middle rear sprocket (Most used), it doesn't slip when in big ring and in the same middle rear sprocket. If a sprocket was worn, wouldn't it be slipping in both rings?

Could this just be the result of the chain not being straight and the rear derailleur in need of some adjustment, or does it look likely I might need a new cassette?

Thanks

ps. For people having a similar problem.

pgd-pgd

Could be related to new chain length.

Heres a link that might help.
http://www.sheldonbrown.com/derailer-adjustment.html

blorg

No, you need a new cassette. The rear derailleur even if out of adjustment won't cause in place skipping.

Holyboy

When you're in the smaller front ring a lot more torque is transferred to the rear sprockets and wheel even though the gear seems easier, when in the larger ring it is the opposite and the chainring takes the brunt, it may also have a small amount to do with chainline too, I guess you should just change the cassette before it wears your new chain out too much!

nitrogen

Thanks for explaining the cause of the problem.

Just when I thought everything was good, gotta take out the credit card again.

Muchas gracias

blorg

For the future, if you change your chain earlier, you don't need a new cassette. It is only if you leave it too long, it damages the cassette and you need to replace. You should be getting around four chains to each cassette.

nitrogen

Thanks, blorg.

I left it way too long to change the chain. Anyway, will know better next time.

elchupanebrey

blorg wrote: »

For the future, if you change your chain earlier, you don't need a new cassette. It is only if you leave it too long, it damages the cassette and you need to replace. You should be getting around four chains to each cassette.

How often would you want to be changing the chain?

nitrogen

I've read between 2,000km & 3,000km.

Holyboy

Just for the record, I am not a fan of replacing only chains, I think it's much better to wait until it's all worn out and then replace the lot!!
What ever some websites might say, putting a new chain on even a slightly worn cassette is just going to wear the chain much quicker and causes bad shifting and many gearing problems.

nitrogen

Holyboy wrote: »

Just for the record, I am not a fan of replacing only chains, I think it's much better to wait until it's all worn out and then replace the lot!!
What ever some websites might say, putting a new chain on even a slightly worn cassette is just going to wear the chain much quicker and causes bad shifting and many gearing problems.

You might have a point since that I had no slipping on old cassette + old chain, but problems with new chain. But what about strain on the chain, ignoring wear by friction – surely the chance for a chain breaking is higher the longer you use it?

Holyboy

nitrogen wrote: »

You might have a point since that I had no slipping on old cassette + old chain, but problems with new chain. But what about strain on the chain, ignoring wear by friction surely the chance for a chain breaking is higher the longer you use it?

Good question,imo a worn chain isnt more likely to break if its in good condition,most chains that I see broken are usually very dry and damaged,im not sure why lack of lube causes a chain to break but it seems to!

blorg

Holyboy wrote: »

Just for the record, I am not a fan of replacing only chains, I think it's much better to wait until it's all worn out and then replace the lot!!
What ever some websites might say, putting a new chain on even a slightly worn cassette is just going to wear the chain much quicker and causes bad shifting and many gearing problems.

This is an incredible waste of money and entirely unnecessary. A chain is much cheaper than a cassette. If you replace your chain on time (measure it to check) there is absolutely no need to replace the cassette. Additionally, if you _really_ leave it too long you will also wreck your chainrings, which are even more expensive to replace!

I have experience of all of this (ruined cassettes, worn chainrings, broken chains) until I started to clean and lube and replace the chain when necessary. I started doing this in 2007, so four years ago.

I have not replaced a cassette since with about 60,000km riding. Note I do have multiple bikes (10) and wheelsets (5 between my 2 road bikes) as well as a couple of spare cassettes in different ratios- so the use is distributed, although the road bikes would have seen the bulk of it. I replace my chains on time.

On my current ride (touring on one bike) I have been replacing between 2,500km and 5,000km. Over 12,000km in and on my third chain, original cassette. No skipping. Mostly dry riding but I haven't been looking after the chains very carefully and have had a fair bit of sand.