Stay Strong x Avian Forks. We have collaborated with Avian to bring you these Versus carbon race forks. The Versus steerer tube is made of 4mm thick 7005 aluminum and features an M10 thread internal locking system to eliminate expander plugs & star nuts that often compromise strength. The aero carbon fibre legs are made of highly durable Toray fibre with 10mm alloy drop-outs. The Versus Youth Fork is compatible with BMX frames that have both 1" and 1-1/8" head-tubes. Headset spec will be determined by your frame manufacturer. Rider weight limit for this fork is 115lbs.