Kawasaki Ninja ZX-4R or ZX-4RR: The Differences, and Which Makes Sense for You

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Kawasaki surprised the market by reviving a formula many thought lost: a mid-displacement supersport with an inline-four that spins beyond 15,000 rpm. The Ninja ZX-4R and ZX-4RR share exactly that DNA, both making 77 hp (80 with ram air) from a 399cc four. With the engine identical, equipment and suspension set the two apart, and this piece breaks down which suits which rider.