Welcome to the madness. Pic's are always welcome too. Replacing the balloon tires depends on how much you plan on riding and where. You'll need two adapter plates for the rear axle hubs and another up front if you don't replace to a '75 and newer axle/hub assembly. The best storage advice with balloon tires on the bike is to raise off the ground eliminating flat spot cracks.
"HJ"
’84 YT60
’85 350x (423cc) with ’81 XL500 head conversion
’83 XR500 (628cc) converted 3 Wheel hybrid
’73 CB750 K3 converted 3 Wheel hybrid
’86 TRX250R chassis XR650L engine hybrid
’89 TRX250R (stock )
’90 LT500 Quadzilla
’85 FL350 Odysses ( water cooled head )
Lost (sold) but not forgotten ’80 ATC 110 (205cc on alcohol ) ’83 200x ( 222cc ) ’83 200x ( 185s eng ) ’85 350x ( stock )
added to the collection recently, (2) '70 US90 Aquarius Blue and '74 ATC90 Daytona Orange