Thanks for the comments, I'm happy to report that today I took off my 700x25 tires and replaced them with.....rear 32cm and front 28cm. I can't believe how much smoother the ride is, now I realize why so many touring types run the 28's and 32's! I especially like the addl load capacity of the rear 32 with the trailer being pulled. This Saturday I'll be doing a "dry run" 80 miler with full trailer/cargo (in the Graeagle area of the Sierras) , we'll see! Raydog