OT, but I recall a very fine afternoon in the Fens a few years back when Kim and I cycled from Mildenhall to Prickwillow Museum with a stonking tailwind. We were dreading the return trip, but holy of holies, the wind was, if anything, even stronger when we came out, but it had turned 180°. We were cycling on the flat (in the Fens?!) at about 30mph.
ISTR that Kim, on her Street Machine, outpaced me marginally on my Thorn, but I discovered that I hadn't changed into top gear...