All Diamondback tires are modern radials. They DO NOT require tubes.

I have 16" Diamondback tires on my Packard and they have no tubes. Original 4" rims, too.

Call the company and ask them. Maybe if you have worn out rims that leak or won't allow the tire bead to seat properly then maybe a tube is required.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)