For me it isn't as cut and dry as X-wind speed is a go/no-go. It totally depends on wind direction and gusts. If it is a steady but strong wind in a "predictable" direction I ride. i just pick a route with mostly tail/head exposure and consider it a "challenge." If it is gusty (?) and/or the wind direction is changing a lot then I consider not riding. Crosswinds and gusts turn a managable windy day into a constant threat of pavement-kissing. Yesterday was supposed to be 7-12mph winds and they were real steady when I headed out. No problem. 2hrs later it was gusting at 2x the mph (my perception) as a crosswind in addition to the steady headwind. This was strong enough to slide my front end 5inches laterally into the roadway. By some miracle I did not fall but, this was definately a no ride condition despite the "7-12mph" reported speeds...