Size Head Angle Seat Angle Top Tube cm Headtube cm Chainstay cm Wheelbase cm Standover cm | S - 16” 71.0 ° 73.5° 57.5 12 42.5 106.4 78.5 | M - 18” 71.0 ° 73.0° 59.5 13 42.5 108 80.5 | L - 20” 71.0 ° 73.0° 61.5 14.5 42.5 110 82.5 | XL - 21” 71.0 ° 73.0° 63.5 16 42.5 112.1 84.4 |