http://www.scottishmountainbike.com/Pages/kirkhill/kirkhill.php
You can cycle almost all of the way to the top of the most Easterly of the Munros, Mount Keen, from the North (I've walked it, not biked it)
http://cycling.visitscotland.com/find_route/whiskycountry/glen_tanar_mount_keen?view=Mountain%20bike
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http://www.scottishmountainbike.com/Pages/kirkhill/kirkhill.php
You can cycle almost all of the way to the top of the most Easterly of the Munros, Mount Keen, from the North (I've walked it, not biked it)
http://cycling.visitscotland.com/find_route/whiskycountry/glen_tanar_mount_keen?view=Mountain%20bike