Mr Lees, 19, and an 18-year-old man, who has yet to be named, were riding home from work on the bike at a Wetherspoons pub in Walsall when they died in the smash on Tuesday night.
Paramedics treated the teenagers at the scene but were unable to save them.
A 58-year-old man was arrested on suspicion of drink-driving and causing death by dangerous driving and has been released pending further investigation.
Tributes have flooded in for the two men, with friends and colleagues unable to comprehend such a tragic loss of young life.
Aneeka Khan, who used to work with Mr Lees, told Sun Online: ''He was such a funny and hardworking friend.
''We used to work at McDonald’s together and with Alex around it was never boring, we always used to have banter.
''Alex was a really good friend too, he was always there whenever you needed someone to talk to. I will definitely miss him a lot.''
On Facebook, one post said the teenager's death was ‘heart-breaking’ and described the 19-year-old as ‘amazing’.
While another said: "So so shocked to hear about Alex Lees, such a great lad taken way too soon. Sending my love to his family, rest in peace Alex."
Others were seen comforting each other as they laid flowers and cards at the scene of the crash .
One card read: “How can this happen to such an amazing person?”
Other tributes said: “Alex, taken too soon. God bless. You will be sadly missed.”
Mr Lees was a keen sportsman and his teammates at Wednesbury Hockey Club have also paid their respects.
Speaking on behalf of the club, Chairman John Taylor said: 'It is always a painful day when we offer our condolences for the passing of a club member.
"It is even more distressing when it is for a young player.
'Today the club offers our heartfelt sorrow and regret at the passing of a young 19-year-old player who had made his mark in the first team. A young player with a great personality and who had good skills and a great future.
''Alex Lees passed away as the result of a road traffic incident around midnight on March 13th/14th 2018.
''Our condolences to his mum and dad on the loss of their only child.
''What else can be said, nothing, as we are all speechless at mourning the loss of a team mate and friend.
''God bless Alex.''
West Midlands Police is now calling for anyone who witnessed the crash to come forward with evidence.
Pc Karl Davies, from the Collision Investigation Unit, said: “This is a heart-breaking incident in which two young men have lost their lives.
"It appears they were heading home together from work when the collision happened.
“Our officers have conducted house-to-house enquiries and are in the process of seizing CCTV in the
area in a bid to build up a picture of what happened in the moments leading up to the collision.
“Broadway is one of the main routes into Walsall and I’m sure other road users will have witnessed the collision or the bike riding along the road.
"I’d urge anyone with information to contact the Unit as soon as possible.”
Anyone with information on the smash can contact the Collision Investigation Unit on 101 or email FL_COLLISION_INVEST@west-midlands.pnn.police.uk
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