The frame of the triathlon bike defines the weight, strength, stiffness, durability and the cost of the bike. Most frames are constructed of steel, aluminium, titanium or carbon fibre. Each has it’s unique characteristics around which the frames are designed.

Steel: Steel is cheap and easy to work with so can produce the least expensive frame. Compared to other materials mentioned, it is heavy but improved steel frames built with Reynolds 831, Dedacciai or Columbus tubing can rival the lightest frames on the market built from other materials. A well made steel frame will last for years with the proper maintenance but it can rust in humid climates.

Aluminium: Aluminium is reasonably priced. Rustproof, stiff, lightweight and responsive, and tubes can easily be formed into aerodynamic shapes. An aluminium frame can be too stiff though making it uncomfortable on long rides. It is also difficult to repair and has a life expectancy of only 5 years.

Titanium: Titanium is rustproof, responsive, light, supple and absorbs road shock for a comfortable bike ride. It has only half the density of steel and makes the lightest frame available. It is very durable and will last forever. It is the most expensive of the four frame materials and is difficult to repair.

Carbon Fibre: Carbon Fibre is four times stronger than steel for the same weight. It can be moulded into any shape and it’s fibres are orientated to make it stiffer laterally than vertically. This means that a carbon fibre frame will not flex with hard pedalling but will still absorb road shock. It is rustproof but is difficult to repair and is expensive.

Armed with this information, you should be well on your way to deciding what triathlon bike will suit you, your pocket and your triathlon goals.