In reply to KennyWright:
Is that the lodge further on from The Kingshouse? (At work, no maps)
If so, we once biked from Glencoe to Rannoch Station, and it was a challenge over Rannoch Moor, with more pushing than riding. You definitely needed a MBK. There were some new (at the time) fire roads through new plantation I seem to recall, that made it a shade easier as we got West.
If it isn't, my apologies for a crap post!