john, you will have to excuse me for my ignorance of all the forms names/designatores. i am a younger guy just getting into this.
i have a major repair and alteration sheet in my logs that show that i had 600X6 tires replaced with 850X6 tires on cleveland model 30-631 wheels.
if this would help you i could get you a photo-copy of this.
bill 208-681-8757
800 X 6 tires
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