Theres not really much difference as the ZZR came with a 17" wheels. That said the KR1-S forks & swingarm moved both wheels backward relative to the frame. That definitely improved the turn in, this thing now turns on a thought.
Weight is the only real difference between different wheel/tyre size combinations & 16" came to the fore because they were lighter than the normal 18" wheel/tyre combination of the day. The down side was they needed higher profiles to get the correct rolling circumference, but that had its own issues. So 17" became the preferred option due to lower profile tyres reducing weight even if the rim weighed a little more.
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