Dutch roundabouts - the cycle ring
Most modern Dutch roundabouts have a dedicated cycle ring - a separate circular path for cyclists that runs around the outside of the car roundabout. At most of these roundabouts, cyclists on the ring have priority over cars entering and exiting. Cars must yield to you when crossing your ring path.
But - and this is the critical detail - you need to check for shark teeth at the car entry and exit points to confirm this priority. If the teeth face the cars, you have priority. If there are no teeth at all, cyclist priority on the ring is not established, and normal rules apply. You cannot assume priority just because a cycle ring exists.
Older roundabouts, rural roundabouts, and some suburban ones may not have shark teeth. At these, treat every car entry and exit as a potential conflict point and proceed with caution.