Shane & Trevor have just come back from test riding this run.
From Tench Reserve to Springwood then on to the siding will be 1 hour 15 min with a catch up at the Hawkesbury Rd lookout.
From Springwood it is all 50 Kph so suitable for small bikes.
The Lapstone route will go about 40 minutes and is all 50kph
Return is 20 minutes
So perhaps a tiddlers run ?