I asked Polley Motorsport and Yokohama UK and got quick and helpful answers, respectively: The AO21R will still be legal for use after 2015 if you already have them, what I mean by this is current stock and any tyres you have will still be road legal but new stock from Japan will be rebranded for competition use only. After 1st November 2014 the current A021R range will not meet the latest EU legislation regulation requirements [R117], however it is still ok to supply the tyres if the production date is before 01/11/14. The tyres will also still be ok to use on normal roads. Production of A021R after 01/11/14 will be in a modified form, with different sidewall markings and will be supplied only for racing/competition use.I then asked Yokohama if they could tell me which part of R117 caused the problem but haven't heard back. Jonathan