Reno Bike Map
The RTC publishes a bike map for the Reno/Sparks area. Updated for 2012, it is available at local bike shops and a few other government-type places. The RTC Bicycling Page has a complete list of locations.
There is also a PDF version: RTC Reno/Sparks Bike Map
You can also use Google Maps and turn on the Bicycle layer. This is fairly complete, but there are a few streets missing.