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Ah ok. I presume they would have a min BB height - I'll try and find out. What's the easiest way to check mine, out of interest? Bit of string between drop outs then measure vertically from that?
Edit: unlazied myself and asked the internet about BB heights. Mine is about 11.5" from the floor which meets newports 11" minimum. They say 165mm cranks though, and I've got 170mm. Would that make a huge difference to the minimum necessary BB height?
You'll also need to be sure the BB is at adequate height. Older track bikes tend to have been built with lower BB shells to be ridden on shallow tracks not steep modern banking.