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@Phil.J
Andy.w - The chainring, chain and rear cassette are all in good order, and reasonably new - I'm pretty sure it isn't that.
Basically, whenever i accelerate out of traffic lights, or I'm pushing really hard up hill (i.e when I'm putting it under a lot of pressure), something goes "BANG" and it feels like something jumps or slips. I cleaned everything really well, but it still does it?