A fairly short one - go up to North Richmond, chuck a left at the lights, I believe that road is the Grose Wold Rd, follow that thru some nice twisties. Come back down thru the Kurrajong township. Go across the main road intersection (which now has lights on it as I found out, coming back from a rally in Bathurst 2 weeks ago) and you are now on the Comelroy Rd, follow that all the way thru and it brings you out on the Putty Rd, left to go to the Colo, right to head back to Sydney.
Have to agree about the Old Road. Been riding it on and off since the late '70's. Just don't go up there anymore (unless it's for a good reason). Best time, like as was said before, was when it was posted 100kmh and when I had my old Mk4 LeMans
Bob