The s works tarmac features an impeccable s works fact 11r carbon fibre construction thats unbelievably light stiff and reactive in other words its purpose built to be a true all round race bike which is no accident in fact it comes as a result of our rider first engineered design that applies specificity to every tube size and carbon layup for every frame size this creates the optimal balance of rigidity weight and responsiveness so every frame regardless of size performs just