[Richard230]

Here are a few words (not everything you need to know  ) regarding the Shinko motorcycle tire lineup. Check out their Classic 240 tire design. That looks like something that might look good on an RE Classic or Iron Barrel, if they come in the proper sizes.  https://www.motorcycle.com/products/shinko-motorcycle-tires-everything-you-need-to-know

[hpwaco]

Don't find any 18" sized for 535gt

[AzCal Retred]

Virtually identical tube-type Shinko 270 87-4624, 4.00 x 18"

Shinko 705 Dual-sport   87-4525   ,  4.10 x 18

Shinko SR777, tubeless, multiple 18" options

And there's these "Pirelli-like universal tread" for $79.19...they wear well, but if you ride your GT535 hard you probably need actual sticky tyres.
https://www.midwesttraction.com/store/c7/street/p5609/duro-hf308-400-18-frontrear-4-ply-motorcycle-street-tire/

[hpwaco]

Thanks for info on Duro tires

[AzCal Retred]

My 4.00x19's seem like they'll be good for 12K or more, like the K70's of yesteryear. Pavement traction is plenty for my needs, and the tread works well on dirt backroads.

[Karl Childers]

I like Shinko tires and use them quite  bit. I have used them on sport bikes, dualsports and cruisers with good results, They work as well as other brands costing much more. I currently have a pair of retro style on my Harley bobber and an aggressive on road / off road pair on my 1200 GSA. Geeky name but great tires.