The 900m comes from a few peoples Polar/GPS units and the 728m from the mapping website. Its safer to believe the 900m when considering the ride

Grades, don't know, but the profile is fair compared to rest of the ride.

For any first timers, the start time is a sharpish 6.30pm to make sure we are back with some light to spare. So please don't under-estimate your journey time to Thalwil.