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seen Nov 21 '12 at 9:49

Oct
31
comment How to reassemble spring assembly on Shimano M520 SPD pedals
I've taken mine apart for a good cleaning and I'd also like to know :)
Oct
4
comment Six speed chain on an eight speed bike
Now you've given more info it sounds more than likely your rear sprockets are worn and need replacing. Your most commonly used front chainring is also most likely starting to wear and may 'slip' when you're doing some powerful pedalling with the new chain. To reduce wear on the sprockets, keep the chain clean and replace it before 12 outer links (which should measure exactly 12 inches) grows by more than 1/8th of an inch.