Two teenage boys killed in a horror bike crash in Sydney’s west have been remembered as best mates in a wave of emotional tributes from devastated friends.

Adrian Lai, 15, and William Drake, 16, were riding a trail bike along the Liverpool Parramatta Transitway at Bossley Park when tragedy struck about 7.15pm on Monday.

Emergency services rushed to the scene to find the bike had collided with the side of a commuter bus before becoming wedged underneath the vehicle. Both boys died at the scene.

Within hours, harrowing footage began circulating on social media showing the motorcycle trapped beneath the front of the bus as paramedics desperately performed CPR on one of the teens.

Heartbroken friends flooded social media with tributes, remembering the pair as fun-loving boys who were highly- respected within the bike community.

‘Rest in peace Adrian, one of the most funniest ones I knew,’ one friend wrote.

‘Seeing you today and not knowing it was going to be the last time is crazy and sad.’

‘William, never thought I’d lose you this early. Thank you for everything you taught me on the bike. I’d be nowhere near where I am without you,’ another added.

William Drake and Adrian Lai died on Monday when the motorcycle they were riding hit a bus

Within hours, harrowing footage began circulating on social media showing the motorcycle trapped beneath the front of the bus

The pair were riding tandem at the time of the crash

‘It’s a wake-up call to everyone – get rid of these bikes, they are not toys.

‘It kills to know you’re gone and doesn’t feel real.’

William’s older brother, Byron Drake, also shared his grief, thanking a family friend for posting a tribute.

‘Thank you so much for this video you have posted for my little bro,’ he wrote.

Friends have since organised a memorial ride in honour of the boys, set to take place on April 3 at Bankstown Airport, urging those attending to ‘ride safe and respect the day.’

There has also been concern for the bus driver, who was taken to hospital for mandatory testing following the crash.

Police confirmed neither the driver nor any passengers on board the bus were physically injured.

While the teenagers were initially believed to have been riding an e-bike, transport officials later confirmed it is now thought to have been a petrol-fuelled trail bike.

Adrian often posted pictures of himself performing stunts on his bike

The bike was wedged under the front of the bus

Friends have organised a ride in memory of the teens

Read MoreBREAKING NEWS One teen dead and two others fighting for life after horror crash in Queensland

Both boys regularly posted updates to their social media accounts showing them performing wheelies in the street and riding tandem.

NSW Police Commissioner Mal Lanyon said it was a tragic scene that would impact many.

‘We’ve got two young boys who won’t grow up, we’ve got two families who will grieve forever at the loss of their loved ones,’ he told 2GB.

‘Importantly as well, we’ll have a bus driver who will be significantly impacted, and for our first response officers, our emergency services who have to attend these scenes, they are incredibly difficult to go to.

‘So our thoughts are very much with the families and certainly those impacted.’

The crash came just hours after NSW Police revealed they had issued 170 fines during a two-day operation targeting illegal e bikes in Sydney’s south last week.

Officers spoke to more than 215 e-bike and e-scooter riders last Wednesday and Thursday and issued a further 99 cautions.

‘More than 250 people were breath-tested and 26 people were drug-tested,’ police said in a statement on Monday morning.

Tributes poured in for the bestmates with classmates sharing their memories

The pair were well loved members of their bike community

The tragedy comes as new laws allowing NSW Police and Transport for NSW to seize and crush illegally modified e bikes are set to be introduced into parliament

‘There were five e-bike riders who tested positive to drugs.

‘Police laid five charges for criminal offences and 21 traffic charges.’

Traffic and Highway Patrol operations commander Anthony Boyd said officers take illegally modified e-bikes and dangerous riding seriously.

‘NSW Police will continue to conduct operations to prevent reckless riding where other road users and pedestrians are put at risk,’ Superintendent Boyd said.

It comes as new laws allowing NSW Police and Transport for NSW to seize and crush illegally modified e bikes are set to be introduced into parliament.

The proposed laws are aimed at curbing the growing use of throttle-only high-powered e-motorbikes, which authorities say are fuelling dangerous anti-social behaviour.

The legislation has been modelled on existing laws in Western Australia, where police already have the power to seize and destroy illegally modified bikes.

In an Australian first, the laws will also introduce roadside dyno units designed to detect whether an e-bike can exceed the 25km/h speed limit.

Transport Minister John Graham said the changes marked a significant step forward.

‘We don’t want to discourage safe and healthy e-bike use, but we do want to discourage dangerous and illegal e-motorbike use and these powers will do exactly that,’ he said.