Not a complete answer but having an 8000ton forged wheel vs a 4000ton forged wheel does not necessarily make it stronger in all cases.
If the wheel design is exactly the same and the same exact amount of material is used then yes 8000ton would be stronger.
But if a company using 8000ton forgings decides to shave a lot of material off to make it super light then a 4000ton forged wheel using the proper amount of material can be stronger.
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