After weeks of speculation, Specialized have launched the new triathlon-specific Shiv frame at the Ironman World Championships in Kona, Hawaii, and announced it will be the race bike of two-time Ironman world champion Craig Alexander.

The original Specialized Shiv was launched in Hawaii two years ago before a UCI-legal version hit the mass market, but the 2012 Shiv tears up the UCI rulebook with a radical triathlon-specific shape.

Specialized say the new bike will be more aero in a wider range of conditions and its five-size range and fit options mean riders of almost any size will be able to find a Shiv to fit.

Specialized S-Works Shiv Di2

The Specialized Shiv Di2 is the range-topping complete bike

Specialized S-Works Shiv Module

The S-Works Shiv module comes with reversible seatpost

The 2012 Specialized Shiv features a much deeper downtube, which would breach UCI regulations but gives a better aerodynamic advantage for triathletes. The tube shapes have been optimised to cope with crosswinds – which should be put to the test by Craig Alexander in Kona – and the new integrated drink system means there’s no need for drag-creating bottles on the frame.

The module also comes with the new ultra-adjustable Specialized Carbon Aerobar with semi-integrated stem, and S-Works FACT carbon OSBB (over-sized bottom bracket) crankset with TT chainrings, removable carbon spider and ceramic bearings.

Specialized Shiv Pro SRAM Red

The Specialized Shiv Pro SRAM Red comes built with DT Swiss Axis wheels

Specialized Shiv Pro OSBB frameset

The Specialized Shiv Pro OSBB is also available as a frameset

Specialized Shiv Expert

The Specialized Shiv Expert has a different seatpost to the higher-end models and is specced with Shimano Dura Ace gearing

Specialized Shiv Comp Rival

The Specialized Shiv Comp Rival has an alloy aerobar but keeps the adjustability of the higher-priced models

Specialized Shiv Elite A1 Apex

The Specialized Shiv Elite A1 Apex is the only UCI-legal frame in the range and is a hydroformed aluminium frame with SRAM Apex gearing