... .Rim:steel/plastic 4.Bearing:16,20,15,19 PU foam tyre 250-4Our factory is one of the leading manufacturers ... ! More details:1.Model/typle: PU foam tyre, pneumatic wheel, solid wheel etc.2.Size : PU foam tyre(6x2,2.50-4,3 ... ,13"x5.00-6,4.80/4.00-8,etc.)pneumatic wheel(6"x2",8"x2.50-4,200x50,10"x280 ...