A clean look, and some rust protection
When I used to live in a tropical area by the seaside, I noticed that the open end of a two-piece bicycle crank was among the first places attacked by rust. Now I live far from the sea, but the swingarm pivot area of the z900rs has exactly the same vulnerability, so I got this set with that in mind. Crucially, the O-ring channels are ample enough to allow for a good preventative greasing, and the caps fit flush with a few taps from a rubber mallet. I had to hand-fab little collars out of aluminum piping to get the frontmost caps to fit into the sockets on the crash bars (SW Motech), but they fit flush to OEM frame tubes.
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