If the East Highland way is the Great Glen Way then yes, if it is the old General Wade road and the Corrieyairack Challenge route then I'm not the one to ask but I have heard it is pretty tough going.
I also know that the upper loch lomond side section of the West highland way is pretty unrideable in sections - a huge hike a bike rocky challenge so travel light
I also know that the upper loch lomond side section of the West highland way is pretty unrideable in sections - a huge hike a bike rocky challenge so travel light