In reply to abr1966:
The cycle track goes from Glencoe to Oban, with a gap of a mile or two immediately after Duror, and a longer gap (3-4 miles) from Connel to Dunbeg. Also, the pavement between the Ballachulish bridge roundabout and Curran ferry has been redesignated as a combined footpath/cycle track, with the surface widened and improved at various points. The surface is fine for road bikes, carbon or otherwise, and quite a lot better than the current state of most of the roads about Lochaber. But take your chances with the potholes if you prefer... The only thing to watch out for on the cycle track at this time of year, apart from frost, is the occasional green spot in shady areas. A good loop, about 70 miles with some climbing, is Glencoe-Corran(ferry)-Strontian-Lochaline(ferry)- Fishnish-Craignure(ferry)-Oban, then home. All but 5 miles or so on very quiet roads or cycle track. For something shorter, down the cycle track to Appin, then do the Port Appin-North Shian and/or Loch Creran loops, and return same way. You could also nip over to Lismore on the wee ferry from Port Appin if you fancy it.