What size tyre did you change to to keep the circumference the same as the original 200/55? 190/55 is smaller circumference and 190/60 is larger!For what it's worth going to a 200 rear more often then not makes the handling worse. My Ninja H2 had a 200 rear std from the factory and handled very well however I took a punt and went to a 190 and it handled even better! . I was told "oh you don't wanna mess with it" from guys that don't know anything or people that have never been out of the comfort zone. But in the real world bum on seat riding and experience you can tell if something works or not. Wasn't recommended for TC corruption possibility reasons but even so handled noticeably better. I was careful though to get a tyre virtually identical in circumference not to change the geometry of the bike ( which I was very happy with). Changing even what would be regarded minute (in circumference) by most people does change pretty dramatically the handling of the former setup. I would say it's not the way to make these handle better but perhaps going one size smaller would be a better bet in that regard. Going to a 200 rear might look cool but in the next corner look out. Of course going to a bigger tyre is going to mess with the TC capability thresholds etc.
As for the comments on the OEM tyres are crap (that's interesting) although they aren't my choice of tyre, correct pressure and suspension setup they are fine in my opinion just have bad durability and don't last as long as the Michelins that I am used to.
Here here! Nice to see well informed members !and another small thing to be taken into consideration.
Normally an oversized tyre takes more effort to lean from one side to the other. Not only the physical profile but also the reciprocating mass is increased. Therefore the bike actually will turn slower unless you put more effort into the same transition.
In the old days a lot of the club racers I would hang around with would often put a smaller tyre on for quicker handling and better grip on the track. If you were less tired (pardon the pun) towards the end of the race you will always stand a better chance of putting one over on your competitors.
Of course things have moved on and bikes are more powerful and tires are whey better. In the real world I don't think it will make a lot of difference, it's all knit picking really.
I've have some pretty good riders pass me on what I would consider pretty $hitty tyres and I wouldn't even have the bottle to attempt what they had just done on some of the best latest rubber!