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@deleted
Hmmm. I personally believe that if you very gradually build up to it over time you'll probably be ok. This is my very humble opinion. There are too many experienced riders out there turning big gears on a daily basis who don't have any problems for me to think that you are certain to cause yourself damage. I think its a bit much to suggest that Tom is going to knacker his knees because your Dad did.
The bigger issue is people ramping up their inches too quickly or just jumping in too big.
I'm not going against the conventional and very valid wisdom that spinning is better for your knees but if you're strong enough, you can spin 100" let alone 84".
My Dad hasn't riden a bike since his early teens and he is touching 70yo now. He has knackered knees...perhaps his ratio was wrong ;)