This trail is typically snowy from November through February and may be closed during the summer months due to fire danger. Check with the USFS for current status.
Gear Grinder begins at the intersection of Lower Pine and Pinon and runs west. It's a twisting trail with numerous rocky sections. Gear Grinder is definitely the chunkiest trail in all of the eastern Otero area.
Regardless of which direction you ride this trail, the amount of climbing and descending is about the same. You'll get a workout in both directions, but riding from north (where it connects to Bear Scat Trail) to south is a net-downhill route.