1926 TT rear tires are 6.00-20.
Mac's advises 36 to 60 psi.
Seems to be a large range.
The TT has a steel pickup bed, larger than a T or an A bed.
Will be carrying about 750 pounds of displayed items.
Please tell me your recommended inflation pressure.
What is molded on the tires for recommended pressure?
Jay's advice is good. Check the tire. I have 6.50 - 20 tires on the rear of my TT. They call for a max. Inflation of 60 psi, but I run them at 50. The darn thing already rides stiff, 60 psi just make it bounce more.