In the early 1980s, I bought a one-owner '67 Volvo 144, a nice car that lasted me quite awhile. When I got it, it had maybe half-worn Dunlop GS4 radials (165R15, same size as typically used on TR3/4). Those tires might have been ok when brand-new, but first time I drove the car in a heavy rain I found out that those tires floated on water better than an Amphicar (with Herald engine, providing further required Triumph content for this post)! I bought a set of Michelin XZX tires soon after that, and they were actually quite good under most all conditions!
Meanwhile...I'm still trying to figure out why anyone would WANT to be able to easily slide a TR3 around...unless you're planning on going "drifting"? :laugh: