It's time. Did quite a bit of research and found most tires had both pro's and con's. Finally decided to go with the brand currently on the front, a Metzeler. The trike now has 25,000 plus miles, but since I purchased it used, I would imagine this may be the second tire. Could be wrong since it had less than 17,000 miles at purchase. Had to do this before heading to Eureka Springs - probably wouldn't have made it there and back on the current tire.