Rear Tire Question

hayabusapower

Registered
I've been debating with friend the diffrence between 190/50 17 vs 190/55 17.
If I go to a 190/55 is this like adding +1 or -1 on the rear sprocket?
 
Just switched back and I had to change my speedohealer again. But I love the way it feels in the corners.
 
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