Originally Posted by klx678

Of course it should also be noted that going larger on the front will definitely very noticably slow up the turn in and require higher effort to initiate a turn (aka slower handling). The larger rear will also slow turn in and increas effort. Part of that is due to the leverage factor increase due to tire width, slowed turn in due to larger diameter, and part is because there is more rotating mass to change course. That rotating mass also takes a bite from the available power when accelerating and in higher speeds.

If none of that bothers you, have at it.

I actually went down in profile on my bike, from a 110/80-17 to a 110/70-17 to quicken the turn in as well as raising the rear end about an inch and a half or two inches. I like the quick handling, similar to that of my dual sport, but would be considered "a bit nervous handling" to most.

Fat tires may look cool, but if it cuts into performance I won't do it. Neither my 550 nor my 650 need more than the 140 or even a 130 for that matter. I would like the look of a bit wider tire, but just can't sacrifice better performance. If it was a 1000 supersport with 130+ hp it would be different.