After your helmet, your skinsuit and your position, one last – but not least! – parameter comes into play in the quest for the smallest fictions: your tires. Which tires for which rolling coefficient? This is what we are going to explain in this article.
Your position matters!
The biggest part of your drag comes from your position
Your position has a direct impact on the aerodynamic drag. It is likely to observe more than a hundred watts between the efficiency of the position on the time trial bike and that on the road bike.
CdA is a product your position strongly influences
The two key drag parameters that your position influences are surface area exposed to the air (A) and the profile (Cd). To minimize your drag, finding the right tradeoff between A and Cd is crucial.
The position is a combination of many parameters
Your saddle setback, handlebar height, forearm height and setback, arm spacing and inclination, head position, shoulder spacing are all parameters you can play with. What is the best configuration? There is no magic. The only solution: test it!
It's not only about the bike settings, but also about your attitude!
On the left is an example of drag differences captured with our sensors of different attitudes on the bike illustrated in the pictures. We are not talking here about just few watts, but about tens of watts*!!
*0.001m² of drag is equivalent to ~1W at 42.5km/h at sea level and 15°C air temperature.
Can we go really faster on a bike without taking your position into account? Impossible! Let’s find out how your position influences the aerodynamic drag and why it needs to be tuned to optimize the aerodynamic coefficients.
Did you know that even your skinsuit allows you to optimize your performance on a bike? This is 100% due to aerodynamic drag. The weaker it is, the faster you go. Let’s discover more about it.
Choosing your helmet depends on multiple variables, including your morphology. In order to save your energy, it’s important to make the most efficient helmet choice to match your morphology. But first let’s try to understand why.