cleatus (Martin) and I are doing a 150km (and fairly hilly) bike ride on Tuesday: from Warburton to Mt Donna Buang, turning off at the Acheron Way and going up to Lake Mountain, then on the return trip (if our legs are up to it), going up Mt Donna Buang. It's partly an AAC 200 training ride, and partly because bike riding up mountains is fun.
Martin plotted the route here: http://www.bikely.com/maps/bike-path/Acheron-is-a-river-in-hell
. He said the Acheron Way is unsealed but in good condition, so I'm guessing any tyres except for really skinny road tyres would be OK (although I'm certainly no expert on this).
I'm guessing we'll be in Warburton by roughly 8:30 to 9:00, so if anyone cares to join us, let us know, and we can arrange a rendezvous.
I know it's very late notice for a fairly major bike ride, though, but I thought I'd advertise this anyway.