Better steering, lighter feel , and much nicer if you run into twisty roads.
Its a decent difference, and very much worth the extra 6.00 the larger tire costs. If you google it, you'd find 95% of the users liking the change. https://www.google.com/search?q=190/55+for+concours+14&ie=utf-8&oe=utf-8It's technically 9.5mm taller, right? 190mm x (0.55 - 0.50) which is 3/8-inch. I will probably stick with 50 aspect. I can't disagree with the anecdotal evidence, but I don't see how or why this would make a big difference. I change my own tires, so I know I will experiment with it at least once. Agree the OE 21's are loud, especially mine are 5-years old and new! They hold pressure well so far and I'm happy that the TPMS matches my manual gauge. I like Bridgestone, but I will probably try PR3's and Angel GT's. Whatever turns out to be the best interstate/highway tire. Twisty roads scare me; I like to go straight.
The bike is a beast in the curves regardless. It is a very high speed bike and nimble and high speed usually add up to twitchy. I don't want twitchy at 120. The Trophy is not as comfortable at high speed, but much better in the curves.
This is why two bikes is a blessingInteresting. For certain the Concours is not a problem for me in the corners, it's just something I notice. Even my Z1K was like that, but it would turn on a dime. It was fun to rider after riding the C14--it felt nearly weightless.