Tire Collection & Processing Facility
RB Recycling, Inc.
8501 N Borthwick
Portland, OR 97217
These folks take old tires and turn them into recycled athletic flooring, playground surfacing, commercial flooring, etc.
Bundle your bike tires 10 per bundle ( I usually use an old inner tube the bundle them, no wire ties please ), pay a recycling fee and throw them onto the big pile out back. The fee is the one downside to this (around 2-3 bucks per bundle, I forget) and keeping away from the great big front end loaders moving piles of big old tires around in order to throw your wee little bundle onto the pile.
There used to be other places that you could send tires too (Splaff flops was such a site) But they are not accepting anymore. If someone knows of a better place to recycle tires, I’m also open to suggestions.