I have a pair on my KLR. They are HEAVY. Seem to work too. Never had a flat with one. The rear is actually an 18 but seems to work fine on the 17" rim. I have used the same pair in two sets of tires without problem.
BWT, I managed to bend the aftermarket shift lever. I've been told that it may be too strong and put undue stress on the shaft in the event of a get-off. Don't know if that's true. What I do know is that the original can be easily bent back, the new one is another story.