I could do with some advice please, i have a problem with my chain. When i am in a gear usually middle of cassette to bottom the chain slips occasionally especially when i put bit of power into the pedals. It is not when i change gear and i generally set my self up in the right gear if i am starting on a climb etc. Also i rotate two chains normally and clean them after each ride and then re-lube them when i put them back on the bike.
Any ideas???
worn cassette
or worn chains
or most likely both
Hey big guy
Your mech hanger straight?
Or like SFB says.
Evening Mrs.
Should add, chain measuring well under 0.75% wear
Somminks worn 
prob cassette even if it looks OK IME CRC for PG990 cassettes for £45
did you replace chain & not cassette ?
worn cassette & unworn chain would do that nicely wouldn't it/they ?
I had exactly the same problem this week. In the end, after the usual grumbling and tool throwing I changed to a new cassette and the problem was solved.
Well thanks everyone it's looking pretty obvious what i need to do 
looks like somebodys sold you a ropey old bike 
seriously though, are you sure its slipping on the cassette? sometimes it can be a worn middle ring and it just feels like the slip comes from the back
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