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Not sure where we will have camped the night before, but we'll want to get to Edi that evening.. So anywhere up to 150km I guess (ideally less – aiming to meet friends at the pub at 3.30!)
speculoos-
There's not a huge amount of gravel that will take you directly east from Callandar. This route is a fairly direct whack via the best cycle paths (avoiding indirect unscenic wobbles) around Dunblane, Alloa and Dunfermline, with some bonus gravel secteurs around Rosyth and a fun off-road way into west Edinburgh. The Alloa > Dunfermline bike path is inspiring for the quality of the infrastructure and, at a stretch, Clackamannanshire's rich post-industrial history.
For camping, if you don't mind a punchy climb to end your day, there are good wide open spaces in Glen Artney above Callandar. The slopes along the side of Loch Lubnaig are nice but quite steep. I grew up in Crieff but, beyond that, my knowledge of these airts isn't terrific.
JacqueLucque
How long do you have/how far are you willing to ride in a day from Aberfoyle? If you don't mind an indirect loop I can plan something nice.