I may be wrong (probably am!) but I don think the XCEs have the spring tension adjusting screw on the calipers. Instead, there is a thin nut on the brake post stack, on the back side of one of the calipers-- in between the caliper and the frame. You will need a cone wrench to get under there and set the proper tension with that. Most of the time you need to loosen the brake post bolt, set the tension with the cone wrench, and then tighten the bolt down.