I bought these to protect the fork tubes on my 2011 V-strom 650. The top hole is 41mm and works well for pipes. The bottom hole was too big for my bottom sliders which are about 63mm. I had to trim a bit to make a tight seal, but it wasn't a big problem. The first of the included zip ties broke when I tightened it, so I put them on and used some decent ones. Finally, I would recommend using a small hole punch and making a small hole in the bellows in an inconspicuous place to allow air to flow in and out of the boot as you move. The rubber is pliable and should last for a while, which is good considering I don't want to yank the forks again anytime soon.
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