For motorcycles over 5 years old, an ITV is needed every 2 years. Having never seen motorbikes at the test centre where I took my Roomster, I imagine that they are not set up to do these tests there.
As it happens, people in Bigastro can have their test done in the town. The inspectors will be setting up a mobile test station in the parking lot he other side of the by-pass on Wednesday, 4th December. Inspections will be carried out between 9:30am and 2pm and then again between 4pm and 7 pm.