Some of the best wheels are Banebots wheels. They come in a massive range of sizes and widths with a choice of 3 durometers [Hardness to me and you] The 30 shore are to soft for combat really unless you want to change each fight, 40 shore is used my mots people. 50 Shore is hard and reliable but on the metal floor of the arena it tends to slide a little.
Unfortunately they are a little pricey but you get what you pay for and the are Imperial so at some point you will have to go from inches to mm.
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