Aluminum parts: Rims, especially have been given second lives as furniture (see Resource Revival and Bike Furniture Design). Even if you don't have the hankering to be a craftsperson, or get the materials to someone who is, there is still enough value in aluminum that it is often cost effective to separate it out and sell it as scrap to a metal recycler.
Inner tubes: Inner tubes have a lot of secondary uses before they need to be discarded. Generally they are great for "tie-downs". Inner tubes can be used for tying loads to racks, or trailers or hanging things from the ceiling. They have also been woven and used as webbing for chairs and to weave purses and bags.
Tires: A stack of mountain bike tires turned inside out and supported with rod or canes stuck into the ground, make very good composters. Some tires are better for this than others.
Chains, chain rings, etc.: Local artists may be interested -- ask around. They find uses for things. Also, there are instructions floating around the Internet on how to make crafts like belts and wallets from busted tubes and picture frames from chains. If you have exhausted your local options you can check with Resource Revival and Bike Furniture Design).
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