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Tread setting is measured between center of tires
Radial-ply tires do not require special rims.
Cast wheels are used inside and steel wheels on the outside on tractors with duals. Cast and steel wheels
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have two positions for 16.9, 18.4, 20.8, 23.1 and 650/75 tires. Steel wheels for 14.9, 320/90 and 420/80 tires have 16 positions.
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