Introduced in 2005, the Isaac Impulse set the standard for mechanical characteristics in a monocoque frame. A new mould for 2008 with smoother lines and smaller headtube.

54cm frame weighs less than one kilogram, yet exceeds the tough EFBe Top Performance fatigue test standard. It has a stiffness-to-weight ratio of 80.6 Nm/0/Kg., providing efficient power transfer and positive, stable handling. This blend of low weight with high strength and efficiency is a rare combination.

The Impulse is laid-up totally by hand using Torayca T1000G carbon. This is a ‘high modulus’ material that is widely used in high-performance structural applications such as military aircraft and high-end motorsport. The precise orientation and positioning of hundreds of separate pieces of material create a structure ‘tuned’ to provide the desired qualities of low weight, high strength and efficient damping properties.

A fork, headset and seat post are included in the frameset package. Isaac’s 2.718 fork is of a one-piece monocoque design – to spread and dissipate stresses and impacts. The steerer uses a dual-diameter form. The larger diameter lower section provides additional strength and stiffness without a weight penalty. This feature also provides a larger lower bearing in the headset. The lower bearing suffers far greater loads and impacts than the upper bearing, and therefore this asymmetrical design makes very good sense. The dual diameter steerer and asymmetrical headset are original Isaac innovations