For a very long time, equations have been proposed to predict bike fit. This is probably inspired in the many equations available to estimate body density and fat tissue. Anyway, a recent paper proposed a new equation using very interesting methodology. Even though these equations provide a good contribution to the literature, we are working in testing their accuracy in a separate dataset. This is critical because, it is unclear if errors observed by these equations are too large or not to be useful in a clinical setting. Watch this space as we come through with some data to compare some of the existing equations available in the literature.