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@mikec
Well I put my new chain on and my bike is still making a creaking noise when I push down hard. So it wasn't the chain that was causing it. Although it is now much smoother and did need replacing anyhow.
Is it likely to be coming from the BB? When I take off the chain and spin the crank arms its very smooth so I figured not, but is it possible that there is a bb problem that is only noticeable under heavy load so that it still spins freely? I have checked the bike for cracks and Im pretty sure the frame is still 100%. Its a cheap shitty BB been on there less than a year