Given that we appear to be about evenly divided between UK and US folks (and given that "Britain and the United States are two countries divided by a common language"), there should be a dictionary of regional differences in bike terms. The main differences seem to be American English and UK/AU/NZ English.
This was discussed on meta a bit, with some ideas there.
Definitely worth looking at http://cooking.stackexchange.com/questions/784/translating-cooking-terms-between-us-uk-au-ca-nz for ideas how to format well.
I'll make this a community wiki, please simply edit the one answer.