Originally Posted by
shelbyfv
The "height" increases as does the width. This graphic has been posted many times. There is no reliable way to calculate as tires respond differently.
The graphic has me puzzled - it appears that the tire casing increases as the rim width increases. For example, look at two of the curves for 25mm GP4000 – the “100psi on Ardennes” (light blue curve), and “100psi on 19mm” (white curve). The blue curve totally encompasses the white curve. So the increase in rim width appears to expand both the tire’s height and width … in other words, the tire casing itself appears to expand. Magic?