A senior bikie has warned Sydney's escalating feud between rival motorcycle gangs is set to explode, as clubs fly in reinforcements from overseas and stockpile weapons.

The source, who has a long history with bikie gangs and wants to remain anonymous, is predicting more killings after months of rising unrest, shootings and fatal assaults.

The man, who also has a criminal history, has rejected police suspicions that he could be linked to the recent violence.

He says other senior bikies have scoffed at a recent peace overture made by Comanchero president Mick Hawi, and he is predicting further killings.

Mr Hawi has ordered his members not to wear club insignia or ride their bikes, and is calling for a meeting of senior bikies to sort out problems following the fatal bashing of a Hells Angels associate at Sydney Airport on Sunday.

New South Wales Police and politicians have expressed scepticism but Mr Hawi's lawyer, Lesly Randle, says it is a genuine offer.

"The course taken by the police to criticise genuine efforts by other persons of influence are unnecessary and unhelpful," she said.

But the source, who travels with six bodyguards in two cars and would not do an interview on tape for AM, says Sydney's bikie war is far from over.

He has laughed at the Comancheros' olive branch, saying other bikie clubs are also cynical about the prospect of peace and are describing the offer as a "ruse".

Stockpiling weapons

The source also describes chilling details about clubs' gathering strength. He says reinforcements from interstate and overseas have already arrived in Sydney and are preparing for war.

He adds clubs are amassing a significant stockpile of firearms and explosives.

The bikie has told AM the recent bombing of a Hell's Angels Club in Sydney was just a test of bomb-making capacity. He says bikies have also been stealing cars to use in the city's spate of drive-by shootings.

Canadian-based international bikie expert William Marsden says it is not uncommon for clubs to call for backup from their overseas affiliates.

"That can be likely," he said. "It was known that the Bandidos, for instance, came to Canada to try and organise and strengthen their associate clubs against the Hell's Angels.

"They lost out in the end but absolutely that's been known.

"But generally speaking, it's up to the individual clubs to strengthen themselves, to keep themselves going, to organise whatever retribution or war they're going to indulge in."