In reply to Russell Lovett:
Also, why Roybridge? There's parking at NN 2553 7886 which is closer to the hills. Or if you do cycle do it the other way round and stash the bike there. Much quieter and very dense forest to hide a bike in.
And yet another option if you don't have a bike would be to park at the grid ref above, do the walk but drop of Aonach Mor to the NE instead of going all the way down to the car park. Pick up the 'Puggy Line' (dismantled tramway on the OS) and walk back along that. Shorter and more interesting than the Leanachan forest tracks.
Post edited at 21:48