The question I have concerns my wife's '04 Ninja 250. The only 2 options we seem to have for tires are the OEM replacements which are Dunlop K 630. Rear size is 130/80 16 and front is 100/80 16.
The other option is Pirelli MT 75
We like the Pirellis better as they appear to be a more aggressive tread design and are cheaper. The problem is the rear is only a 120/80 16. Would there be a significant difference in handling with a slightly narrower tire? Georgi is a spirited rider, but obviously the bike is small and light.
Any thoughts, ideas would be appreciated.

1998 R1100R
2004 Ninja 250
2004 Ninja 500