... solid, or semi-pneumatic, steel or plastic rim, hub length, bearing diameter etc.Commonly: a wheel includes: tyre+tube+rim ... or centereed. If steel: powerrd coated, or zinc platedBearing: ball bearing, roller bearing or nylon/steel bushingDetail refers to spare parts (tire, tube ... are interested in our products, please don't hesitate to contact us, we will give you our best offer upon receiving ...