Heres how to calculate ground clearance change due to change in tyre configurations- Rolling radius is the distance to ground from center of tyre. It is depicted in the below picture with a red line: From the definition of Rolling radius we know that its enough to compare the difference in the rolling radii of two tyres to know how the ground clearance has been affected. Its calculation is demonstrated below with an example: For example if the tyre is 215/45 R17: Section Width of tyre = 215 mm Aspect Ratio of tyre = 45 Rim Diameter of tyre (D) = 17 inches = 431.8 mm (1 inch = 25.4 mm) Sidewall Height (SH) = 215*(45/100) = 96.75 mm Hence rolling radius for the above tyre will be: (SH + D + SH)/2 = (2*SH + D)/2 = (2* 96.75 + 431.8 )/2 = 312.65 mm Some more examples: For Active/Dynamic: (165*.8*2 + 14*25.4)/2 = 309.8 For EP (current Emotion) (195*.60*2 + 15*25.4)/2 = 307.5 With 195/65 R15 tyres (195*.65*2 + 15*25.4)/2 = 317.25 We do not know with which tyre profile the speedo is caliberated for Indian puntos so its difficult to guage how the speedo will be affected. Others please feel free to add to the above information !!