I just purchased a set of Ksyrium SL wheels. With the wheels installed, if I give the front wheel a spin by hand, it spins away for at least a minute before coasting to a stop. Giving the rear wheel a hand-spin though, it spins for about 15 seconds before coming to a stop. Is that normal?

I checked my old wheels (Ultegra hubs + Open Pros) and they just spin and spin and spin and spin...

There's no brake drag on the Ksyrium's. Seems like the hub is dragging. Before I go try taking apart the hub and taking a look inside, does anyone know if this behavior is normal? Or meaningful in terms of real-world resistance?