Changed out my rear tire this weekend... went from a Dunlop 404 140/80-15 to a shiny new Kenda Challenger 130/90-15. And by shiny new, the date code says the tire came out of the mold the last week of June 2015... so it's a 6 week old tire.  

Mostly I did this change for extra clearance under the fender because I'm hoping to add bags this fall/winter. And the Dunlop was pretty well toast and needed to be replaced.

Anyways, the new rubber rides nice, grip is good, and definitely more clearance than before. Bike seems to handle a little quicker, rolls into and out of leans better. Oh, and the speedo is now close enough to call it accurate.

Thanks for the ideas folks, much appreciated, I think I'm a lot happier with this tire than the one that came on the bike.

I went with Dunlop 404's...130/90/15 on the rear.  Stock shocks up to the #5 position.  Dynabeads for balancing.

WOW!!!  Handles like a totally different bike.  Vibrations in grips are noticeably less.  I should have put the beads in months ago.  I have used them on big tires for years so shouldn't have been surprised.

Also, remember the 140 tire has a taller sidewall which will deform more than a 130 in a turn.