Co Antrim boy (9) with ASD learns how to cycle in a month with expert help Harrison with Sustrans Active Travel Officer, Johnny McCrystal Learning to ride a bike led to a Co Antrim boy conquering his fears while discovering a fun new hobby — all thanks to the help of an expert. Harrison Brown had been trying to ride his bicycle without success since pre-school but ended up riding his bike at a local BMX track in less than a month thanks to a Sustrans schools’ officer..