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Polyurethane Solid Tire, simply called PU Tire, has one kind of solid structure. Its main material is microcellular polyurethane elastomer. For the 6 inch Polyurethane Tire, it is usually used as the caster wheels of electric wheelchairs.The Load capacity of this tire is around 30-40kg.
link:http://www.pu-tire.com
6x2 PU Tyres For Wheelchair Front Wheels