More than 2300 people took part in the 101-kilometre race circuit linking Forrest Estate in Renwick with Picton and Havelock.
The event has been hailed as a big success, with most involved having a great time, but some cyclists broke the road rules by crossing the centre line and may yet be prosecuted.
Constable Michelle Stagg, of Blenheim, said police received complaints from motorists about cyclist behaviour on State Highway 1 near Spring Creek and State Highway 6 between Havelock and Renwick.
"It's very disappointing," Miss Stagg said.
Police officers took photos on Saturday showing cyclists riding several abreast and crossing into the opposite lane, Miss Stagg said.
Cyclists are allowed to ride two abreast at most, according to the Road Code.
We must pray Miss Stagg never takes a holiday in London on the last Friday of the month, as this would be very bad for her blood pressure.
