First ride on new Aksium race wheel set.

By 35 miles, the front (radial spoked) was creaking/popping, most noticeable a low speeds i.e. climbing. By 50+ miles, loud and clear at 20 MPH. I stopped a couple of times to make sure the wheel wasn't going to fall apart.

Seems to be spoke nipples moving in rim. Spoke tension is fairly even, maybe went down a bit during the ride.

Thoughts?