A massive brawl erupted in suburban Long Island as 20 members of rival biker crews tangled in a bloody clash across two towns that left four people stabbed and seven facing rioting charges.

Round one of the throwdown erupted at 1683 Sports Bar & Grille in West Islip on Sunday afternoon before the crews dug in for more fighting at Phillips 66 gas station in Lindenhurst, police said.

In Lindenhurst, five miles away from the bar, round two of the fighting ballooned into a full-on street showdown — with blades drawn and blood splashing onto the street, a gas station attendant who witnessed the melee told The Post.. 3

Five men were taken to the hospital and were treated for non-life-threatening injuries.

Four had been stabbed , while another was left bloodied, bruised and battered

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