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OS bikes have a USA bottom bracket shell.New school cranks have either a 19MM or 22MM spindle,so all you need to do is buy a matching size USA bottom bracket bearing set-all decent BMX shops will have them.niceone didnt know that shall get hunting, many thanks HEYWOODBMX
Billy ask Stodgy in the Radshop about twin pinch Redline Flight cranks, he had a good deal on them a little while ago, and you need cromo cranks not alloy
This is so i can make my old school bike as light and strong as poss for racing on.