@South Coast Martin (UK) wrote- "...I've got 15x5.5 fake Fuschs (chromed) but currently I'm running 195/55x15... The steering is too heavy for me (large scrub radius and wide grippy tires) and the clearance is marginal. And I prefer narrower tires for less grip but with a more controlled breakaway. So I'm going to go 175/65 x15 if the car can handle the extra 7mm of radius difference, or 175/60x15 or even 165/65x15 if not.
Hope this helps.."
Great looking Speedster! Any more pics? Did it take any extra work to get the 195's under the fenders on the back?
All those sizes are on the small side of what the front suspension was originally designed for (5.60-15- a 25½-26" diameter tire) and will of course work, but since you have 195/55's on the back, 175/60's are almost exactly the same diameter and (I think) the right call. Al