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@ExTra
I got the BMX cranks only because they are the right size for polo - 25T, and they were cheap and cheerful, ish, but they are heavy. So I am keeping my eyes out for something lighter, but you know with things like this, it's always a bit of luck. And since I have only just started out, I don't want to spend too much on it. This is my reason, but I think some people like the cranks being a wider or something? I am not sure.
The BBs have different ways of installing, A bit more annoying to install from what I can see on the Internet, and require a bit more maintenance, I think? Have yet to try myself.
I am sure someone else would be able to provide a more sensible answer than me.
I feel good now I have learned something new!