Is a Radial Tube Safe in a Radial Tire ?

you can seal the centerline with windshield sealer. I run tubes in my 2 Centerlines because the stupid valve hole is eroded so they all leak there. My Cnnterlines are old anyway and say 'Bias Ply Only'right on the hub. Radial Centerlines use a stronger lip to compensate for the sidewall flex and bulge built into a radial tire. Thats off a Centerline web page.