I can't remember for sure but have around 14 oz. regular BB's in each of my 39.5 TSL's. I've had the Blazer up to at least 50-55 mph and even at trail pressures (single digits) there are no bad vibrations.
I ran a smaller amount in a pair of 33" Trxus MT's on my daily driven tow rig for a couple of years and when the tires were worn out I pulled them off and the BB's and inside of the tires looked the exact same as when I installed them.
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