In the rear at least, there's a big flat headed screw on each side. The sides of the bumper have a keyed slot that this screw fits into. You can adjust the screw up and down a bit to level the bumper. You need to remove the bumper to get to it and adjust it (there are instructions in the Cardisc manual).
It can be a bit tricky to get the bumper lined up with both sides properly slotted. If you get it wrong the leading edge of the bumper will stick out at the rear of the wheel well. Really a two (or better three: one at the rear and one on each side) person job to make it easier.
It can be a bit tricky to get the bumper lined up with both sides properly slotted. If you get it wrong the leading edge of the bumper will stick out at the rear of the wheel well. Really a two (or better three: one at the rear and one on each side) person job to make it easier.