Upgrade tires before suspension, unless you are significantly heavier than "average".
It would also depend on the quality of the tires that are on it now and the type of riding you do. If you have the money, do both, but I feel tires are the most important.
I'll add - I don't know the quality of the OEM tires on the Ninja 300, but I bought a new cycle that had terrible OEM tires on it. I replaced them after riding for 500 mi. A good set of sport tires made a huge difference in the handling. With the OEM tires it was sketchy and would slide and squirm even at a moderate street pace. After installing a set of quality sport tires the handling was 10X more predictable. Just because they are new, and came with the cycle, don't assume they are good - or even good enough.
Last futzed with by jkv45; October 13th, 2014 at 11:13 AM.
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