Total Square, the developers of the iphone/ipad app Mountain Bike Trails, has partnered with IMBA to offer the app free as a promotion during Interbike–that means this week only, so get on with it, download it now from the itunes store.
Mountain Bike Trails has detailed directions to thousands of trails all over the U.S., Great Britain, New Zealand and Australia, and adds new trail information with every update. Preview the trails, add a trial, or join in on a forum here.
