I have a BX24 with 300 hrs on it. Bought in 2007.
My rear turfs are nowhere near 16" wide. I wear an 11 and my shoe is longer than the tire is wide.YES, considerable. Varies by brand of tire. You cannot change just rubber, you must change rims and rubber in combination. Wheel diameter proportions must be maintained or 4-WD will undergo stress, potentially fail.
Turfs widest 16", R4s 12," R1s narrower than R4s 10-1/2".
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Turfs widest 16", R4s 12," R1s narrower than R4s