Vic racing probe into wrong-sized sulkies

The late scratching of all but four horses from the 2014 Ballarat Pacing Cup is being investigated by Victoria's racing integrity commissioner.

Six of the 10 runners were scratched on December 13 after stewards discovered the use of oversized sulkies.

The probe will focus on how and when the sulkies arrived in Victoria, when Harness Racing Victoria became aware of the problem, and its response.

A report will be handed to Racing Minister Martin Pakula by March 2015.