But they also express anger and concern over why Kyrees Sullivan, 16, and 15-year-olds Harvey Evans and Saul Cookson died on the streets of Cardiff and Greater Manchester this year.
"Really didn't deserve this," says one tribute in Snowden Road in the Ely area of the Welsh capital, where best friends Kyrees and Harvey died. "Kids on bikes don't kill," reads a sign at Langworthy Road in Salford, near where Saul crashed.
This week, as it emerged the two officers who followed Kyrees and Harvey had been served gross misconduct notices, politicians, academics and bike industry leaders, called for a review of police tactics - asking whether officers should ever pursue children who are riding electric bikes without helmets.
Sioned Williams MS, Plaid Cymru's spokesperson on social justice, said: "We've got to look at the tactics that are used. I think the police need to review how they are assessing these incidents and the proportionality of how they are responding." She said children should not be pursued if they posed no danger to the public.
Natasha Asghar MS, the Conservative shadow transport minister in Wales, said: "I feel it's vitally important that all police officers within all forces should receive training on pursuing e-bikes and e-scooters." Asghar also called for more thought to be given about greater controls on electric bikes.
Dr Fred Cram, the director of the Cardiff centre for crime, law and justice at Cardiff University, said it was difficult to think of scenarios in which chases of children without helmets could be justified.
He said: "Keeping in mind that in a pursuit the safety of the rider should generally not be put at risk, no matter what they have done, I think the police need to be able to answer a specific question here: is it possible to pursue a juvenile on an e-bike safely?
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