Oldtimer
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Looks like 23.1 x 26 to me, very common on the 540D. Nice middle of the road rubber, good float, OK in deep snow, stable on a side-hill. But tough on axles and steering.
Those tall 34" tires are what you want for deep snow and rocks / stumps...and mud. But don't try turning around on a side-hill.
Those tall 34" tires are what you want for deep snow and rocks / stumps...and mud. But don't try turning around on a side-hill.