Chill out how longs a string , my drive tyres are at 4 mm although they look bad 1 mm is the limit , my drive axle is 8 tonne empty and never ever spins but I know the rigid flats have the same Hancook Dh03 on have to be removed at 4 mm because they’re so much lighter they spin a lot and bits come out then they have no casing value not that hancooks have much value anyway ,hope this helps .