Yes they are adjustable, but not in the sense that you can do it quickly without tools! You need to remove the dog bones and replace them in a different position to make the adjustment.

They do jack-up and lowering versions, but interestingly neither has a "stock" or zero position. They start at +5mm or -5mm.

Jack-Up

Lowering

Also worth noting that, if you have a centre stand fitted, the links can only be fitted in two of the four positions without fouling the stand's bolt threads protruding out of the nuts (although the bolts can be reversed to avoid this issue).

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