The price is primarily driven by the Ply Rating (PR), which indicates the load-carrying capacity; a 4PR or 6PR wheel will cost more than a 2PR due to increased durability. Additionally, the rubber content percentage (typically ranging from 20% to 40%) significantly impacts the price, as higher rubber content ensures better abrasion resistance and prevents premature cracking. Buyers should also verify the bearing type (e.g., 6204-2RS) and rim thickness, as heavy-duty steel rims with powder coating command a premium over thin, galvanized alternatives.