I'm having some difficulty in finding a pair of wheelset compatible with the Sirrus Expert 2016.

After looking for awhile I decided to get the Fulcrum Racing 5 DB but I was told it's not compatible due to the spacing in the axle of the frame, or something like that.

So, other than the Axis 4.0, is there any other set of wheels compatible with this bike? My budget is preferably under £500.

Thanks