As others have experienced, we (Toledo Ohio Bike Co-op) have accumulated unwanted knobby tires (typically 26x2.0) that we don't often give/reccommend for bikers in our all-flat-pavement city.  Has anyone on the list looked at the best options for getting these to someone who can really use them?  Is there any $ense in $hipping them to another group who will include them with a shipment to our third world brothers and sisters?   Thanks, Andy-in-Toledo