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 fork strength. The aero carbon fiber legs are made of highly durable Toray fiber, and the alloy drop-outs are available in your choice of 10mm or 20mm. ###section### Product Specs Steerer Length: 170mm Wheel Size: 20" Material: Carbon Dropout Size: 20mm Offset: 32mm Weight: 21.8oz (with stem-lock & top cap)