I'm not sure what my speed is, but I do know I get going faster than 50 km/h on the way in on the big downhill. On the flats, I probably hit 40 for a few blocks at a time. With the inevitable lights, I probably average 20 km/h, but when I'm moving it's closer to 30 km/h on the way in, 25 km/h on the way out...