Wheel choice
While choosing a wheel, you'd consider several elements: what size and load, pneumatic or solid, or semi-pneumatic, steel or plastic rim, hub length, bearing diameter etc.
Commonly: a wheel includes:
Tires: different tire thread, 2PR or 4PR
Tubes: natural or butyl tube
Rim: Steel or plastic rim, offset or centered. If steel, powdered coated, or zinc plated.
Bearing: ball bearing, roller bearing or nylon/steel bushing
Details refers to spare parts (tire,tube and bearing)
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