can you compost tires?
No — a scrap tire is twenty-odd pounds of vulcanized rubber, steel belt, and zinc built specifically to resist breaking down.
which bins can take it?
- hot pile no
- cold pile no
- worm bin no
- bokashi no
- tumbler no
- curbside no
why?
Everything engineered into a tire fights decomposition: it has to shrug off ultraviolet light, ozone, heat, and 50,000 miles of grinding on pavement. Tire compound runs on the order of 1-2% zinc oxide by weight, and the antiozonant 6PPD converts in the environment to 6PPD-quinone, the compound tied to coho salmon die-offs in urban streams after rainstorms. Steel belts run through the carcass, so even shredding one is a job for industrial equipment.
watch out for
- Tire planters and potato towers are a long-running garden tradition, but extension programs steer people away from them for food crops because zinc and organic additives migrate into warm growing medium.
- Never burn a tire or use one as fire-ring fuel — tire smoke carries dioxins and heavy metal particulate, and a smoldering tire pile is notoriously hard to put out.
what to do instead
Tire shops take old tires when you buy new ones, usually for a state-set disposal fee of a few dollars each, and most counties run scrap-tire collection days. From there they become tire-derived fuel, running-track surfacing, or crumb rubber.
often confused with
- Rubber — Same polymer chemistry, bigger problem: a tire adds steel belting and a heavier dose of zinc and extender oils.
quick answers
Are bicycle inner tubes any different from car tires?
Only in size. Tubes are butyl rubber, which is even less permeable and no more compostable. Bike shops and some outdoor retailers collect old tubes for recycling, and crafters buy them for straps and bags.
Is crumb rubber safe under a swing set or in a raised bed?
Playground use is regulated and studied; garden use is not. The practical concern for growers is zinc buildup in a confined bed, so keep crumb rubber to paths and play areas rather than soil you plant into.