I can't say what the strongest wind I have ever ridden in was but my riders log shows that I left home more than a dozen times this year with the sustained winds above 25 and gusts well into the high 30s or more. Generally I try to start out with a charge into the headwind so I can coast home after I am wrung out. Nothing worse than realizing that you are 30 miles downwind of the car and you are already used up.