Are you looking for trails around the Groveland/Yosemite area? The Groveland Trail Head’s are working on documenting all mountain biking trials on the MTBProject website.  A big thanks to MTBProject for making this great resource.  You can download their android or iphone app to get access to trails on your phone and you can download the GPX trail files to upload into your own GPS system. Let us know if you have any questions or feedback and be sure to rate all our trails after you do them!