Taking the Beach road today and have some speed work. Holding at 40kmh against the wind is ok. Not much cross deviation compare with the Tarmac. One the speed is on it can be hold at 40kmh. It is a bit tricky in the new Dura Ace that I'm missing a 53-16T combo (in a 11 speed 11-28 cassette the ratio is 11-12-13-14-15-17-19-21-23-25-28).