I have the rear Duro HF-308 on the machine. My results were about the same as Tarnand's, nominally 1/4" to 1/2" left & right. Pretty good agreement for two separate installations. Center stand works the same, tire height is virtually the same as the K70, maybe 1/4" larger. Didn't have the alignment issues t120Rbullet did, but this was a newer & different ply tire, 6 ply vs. 2 ply. Maybe these have actually gotten a bit smaller over time as a cost savings measure...? Anyway, the profile is rounder than my K70 at 2K miles. If the Duro still has air in the morning that means the Tyre Gawds were smiling (and I lucked out with my tire irons again) and I'll do a test ride. I'm not too demanding on rubber, I just want more than 2K-3K out of a tire. In a month or so I'll try one on the front. I ABSOLUTELY LOVE the "loosen struts, lift the rear fender" built in 1940's engineering. Obviously these guys were enthusiastic motorcycle riders, a quality lacking in industry today.
Mrunderhill1975a & cyrusb were helpfully commenting on rear wheel bearings on another link. I have the QD wheel (thank gawd) and the sprocket bearing at 8,400 miles was greasy but shot, the cage was busted up and the balls were orbiting eccentrically at random. Didn't seem to have a lot of noise. My sprocket bearing as found was unshielded. I replaced it with another unshielded out of a NOS kit I had. I'll have to order a full new set, front & rear, rubber shielded. It's always something, eh?
ANYWAY - the Duro HF-308 fit my 1999 Bullet's rear end with zero modification. It is rated at 780 pounds vs. 506 for the 3.50 x 19. Theoretically it's wider than the 3.50x19 K70 Dunlop/Sumitomo it replaced. I can't see how it wouldn't last longer, and for my needs it should suffice. It is really stiff when mounting, a lot like a tubeless tire carcass. Max Pressure on the sidewall says 35 PSI, and with those sidewalls I suspect 32 - 34 PSI is a good place to run it. Time will tell. Mine was about $60 from Chaparral thru Amazon, free shipping. Dennis Kirk should have them back in stock soon, even cheaper, according to an e-mail I received from them a few days back. - ACR -