Originally Posted by
CliffordK
Hmmm... I hadn't thought about wind-up of round spokes.
First thing I thought of when I read the OP. But I wasn't a member when this thread was started.
The other thing the OP might want to check is make sure the cassette lockring it torqued properly.
I was once fooled by thinking rear wheel click when it fact is was the rear lock ring had worked loose. It only presented itself after I repaired a rear flat. Started clicking.
But if both wheels tick, I'm betting poor build, spoke binding.
But check the rear lock ring anyway.