Tyre
weight is proving difficult to find, best estimate would seem to be:-
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The weight of a used truck tyre is about 53 kg.
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From:-
http://www.mfe.govt.nz/publications/...tml/page3.html
but that would be a much larger tyre than 7.50x20.
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an 18/32" rib tire in the 295/75R22.5 size, which would have an overall weight of around 110 lb. as an example.
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From:-
http://www.bridgestonetrucktires.com...ctor_facts.asp
I would therefore guess at about half that weight - maybe 60lb at most.
When I was working I would have had access to all the weights that you require. These were published (by me) in a thick catalogue which was supplied to bodybuilders. Included was the dimensions (including weights) of every production option - so that the bodybuilder could calculate payload (and therefore body size required).
If only I still had my books . . .