Man dead, another fighting for life after Sydney motorcycle crash

A man has died and another is fighting for life after a motorcycle crash in Sydney's west.

The two men were seen riding without helmets in Blacktown, with police attempting to pull them over about 1.10am today.

The rider allegedly failed to stop and rode away, crashing into a Lexus SUV a short time later on Balmoral Street.

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A man has died and another is fighting for life after a motorcycle crash in Blacktown.(Nine)

One man was treated by paramedics but died at the scene.

The other was rushed to hospital where he remains in a critical condition.

The four people inside the SUV were not injured.

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Police allege the two riders were seen without helmets before colliding with an SUV.(Nine)

Police have established a crime scene and a critical incident team are investigating.