Bridgestone aren't happy with Vale.

http://www.motorcyclenews.com/MCN/sp.../?&R=EPI-95111

Surely if the manufacturers are in agreeance that there shouldn't be a single tyre supplier, the easy way to railroad such a decision would be to announce that none of them would tender for the supply contract. A bit difficult to have a control tyre if no-one is willing to supply the whole field.