'Black, minority ethnic' ie. non white Brits.
I see all sorts of folk riding bikes to get from A to B, old, young, ethnic minority etc. I don't see older Muslim girls or women riding bikes actually, but I no longer live in an area with a high Muslim population, so there might be more of them, I just don't see them now - but I get the impression that cycle clubs are still mainly white.
Not sure why this is; maybe people have the impression that you need a flash bike and all the gear to join and that expense is beyond many in the BME community, who are more likely to be less well off. Same reason why folk don't take up golf, I suppose.