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You have got also the Oxford option (http://www.oxfordproducts.com/bicycle/brands/oxford/bottom_brackets/bottom_bracket_sealed_cartridge_68mm_threadless/).
Bought on french website mentioning that there is no need on adding a chamfer to the frame, installed it without a chamfer, had no problem. Worth checking with oxford if it does in fact require chamfer though
paulbiche
http://lecycleur.com/parts/mavic-bottom-bracket/
Useful info on the 610 BB...
It would appear that specialist tools are required for mounting it.