Way back when I decided to build a real chopper . . . I had "old biker dudes" selling me parts (at reasonable rates) and giving me stuff. One guy donated a rear fender to my project - the trailer style flat fender off his old chopper. I had a 16" wheel all set up to go, until I realized the arc of the fender fit an 18" wheel. If you run a 16" rear wheel, you have a choice of around 150 different tires. If you run an 18" rear, you have a choice of about 3 good tires. I first ran a Continental ($150.00 Retail) - and the last two tires have been these Kenda Challengers ($85.00 Retail) and they work great ! I get more miles, they grip, they're a heavy 4 ply with a good 3 ply sidewall. I've run air pressure from 15 to 35lbs. and these tires hold up, decent ride all around.
This latest tire I just received looks to be manufactured just last month ! They're a popular tire, so they sell well, and you should always get a fairly fresh one . . .