• Cranks shouldnt be an issue at all, i would guess its sqare tapered,so loads availabe, but from what you say its more likely the bottom bracket getting loose not the cranks. If its not 531 or above it's likely to be Raleighs 26 tpi, making changing the bottom bracket harder. It maybe someone on here can suggest ways of stopping it loosening, which may be a better solution. If you need to replace it though, check the bottom bracket size needed, and if it's 68mm there's a threadless one sold by sjs cycles that I've been itching to see if it works.

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