Good old Stinko.  Why would you want a hard flat track tire?

How dare you put air in it.  

Oh, I wasn't thinking about dirt tracks.  Oops.

Not sure but Goodyear made the tread design , but for a time they used them as a “Rain” tire  for the World GP. In the GP they race in the rain , I think they race in any weather conditions. Easy tires to mount , so soft sidewall. They are huge but once on rim , not much bigger than that rotten Carlisle. I’m interested to see if the rear one fits in the swing arm and clear the chain. The front mounted is almost as tall as a mounted 21” enduro tire.
The BSA is not a big bike and the tires are tall it’s going to be interesting to look at. While I’m just puttin it back together , I’m staying true to keep it a vintage racer , but it’s gonna be race ready too. I would love to ride some TTs on it but we will see what the hip thinks about it. I might start hangin  out at the track after I retire. A good way to spend Friday nights. I think with some practice laps I’ll find out what I’ve been missing all these years. I quit racing to raise a family , I always say “ life gets in the way of building bikes” ! It’s time to play , almost ! My leathers shrunk , I need some leathers. If you’re young and have kids , it about a 30-35 yr layoff from racing. I really just want to ride the track and not race but that will all go by the wayside after the first time I get passed  

Good tip.  Of course, I did not do that last time.  I got lucky.

Sent back the 140/80-19 Shrinko. Both of those are better suited for a twin rather than a vintage single. So the 130/80 going to the rear and put a Dunlop K180 100/90 and it’s a tad smaller than I like but I’m runnin it. I’m getting good at changing tires after all these years. If you do your own tires you have got to get one of these , Motion-Pro Bead Buddy 2. No more wishing you had a third arm , slide it over the rim slide it over a spoke , after that it’s one hand , one lever , Done. Wish I had one 40 years ago. Bead Buddy only for Spoked wheels.