BMX Sizing Chart December 1, 2014 Ronald Average Age Height of Rider (m) BMX Size 4 – 6 Years 1.22 Micro 6 – 8 Years 1.22 – 1.36 Mini 8 – 10 Years 1.31 – 1.46 Junior 10 – 14 Years 1.41 – 1.61 Expert 14 to 16 Years 1.61 – 1.71 Pro 16 + 1.64 – 1.83 Pro XL 16 + 1.83 + Pro XXL / Cruiser