Dimensional equivalences

Step 1


Determine the corresponding SRI using the original dimension.
SRI: “Speed Radius Index” is a parameter used to calculate the theoretical speed of vehicles during EU certification procedures and for the interchangeability of tyre dimensions.


Step 2

Based on the SRI result from step 1, determine the possible dimensional equivalences. This equivalence chart has been produced using ETRTO data; it is not exhaustive. Please consult us for other conversions.


• In no case does the SRI correspond to a specific value of the circumference of the bearing.

It is only given for information purposes only. It is necessary to verify via measurements.

• Any transformation requires the ratio between the bridge and the rate of preponderance to be calculated

in order to check that the width and diameter of the rims are compatible (see technical pages).