The spring surge is the whole first half of the year. It arrives with the first dry weekend, it lasts a fortnight, and the workshops that ranked in February take it.
Marque searches travel. An owner of a particular make will ride past several general workshops to reach one that knows the model, which makes those pages worth far more than their volume.
Tyres and chains are the steady traffic. They are searched urgently, decided locally and turn into work the same week, which makes them the reliable half of the diary.
Storage is searched in October by people putting a bike away. It fills months that would otherwise be empty, and it delivers a serviced bike and a customer back in spring.