Ulverstone Police is calling for witnesses following an evade by two members of an outlaw motorcycle gang on Monday.

Police were conducting random breath tests on Preservation Drive at Penguin about 8pm on Monday 19 November when two motorcycle riders on Harley Davidson motorbikes refused to stop for police as directed.

Both riders were wearing colours identifying them as members of the Rebels outlaw motorcycle gang.

Police had a number of motorists stopped at the site at the time and would like to speak to anyone who may have witnessed this incident or have any information which may help police with this matter.

Information can be provided anonymously by calling Crime Stoppers on 1800 333 000 or online at crimestopperstas.com.au