The Zipper features 2 miles of hiking trails near Sparks, NV.
On I-80 headed whatever direction get off at sparks blvd. headed north. Follow it a long ways out until you get to the Spanish Springs windmill. Then keep following it. Go past the starcrest sign and on your next right you should see a big park being built. Follow the BLM signs all the way to the back of the park. Follow the dirt road for around 1/2 a mile and you should see the singletrack.
http://www.tripleblaze.com/trail.php?c=3&i=1269