Attention: Due to trail renovation works, the Hinterautal is closed for MTBers from the Gleirschhöhe.
Route: Scharnitz Nature Park Info Center - Gleirschhöhe - Isarursprung - Kastenalm - Lafatscher Niederleger - Hallerangerhaus - Lafatscherjoch - Speckkarspitze - Lafatscherjoch - Hallerangerhaus - Lafatscher Niederleger - Kastenalm - Isarursprung - Gleirschhöhe - Scharnitz Nature Park Info Center
Very long hike that requires good physical condition and for the summit climb a head for heights and absolute surefootedness. To save time, it is recommended to go by bike to the Kastenalm.
From the nature park information center, follow the Hinterautalstraße to the Gleirschhöhe. From there, take the left forest road in the direction of Isarursprung/Kastenalm. Park your bike just before the Kastenalm and go over a small bridge to the right, then go steeply uphill past the LafatscherNiederleger to the Halleranger. Once you reach the alpine pasture, the trails split. At the fork, keep right until you reach the Hallerangerhaus. At the house again keep right and follow the path up to the Lafatscherjoch. From there, a narrow, initially easy trail leads to the left towards the west ridge of the Speckkarspitze and later in easy climbing