But my observations are not based on 350 kms driven between 2 cities. Its simply that the Stepney mat is bulging up because of Michelins and mat appears slightly swollen, and this swollen character was not there with Bridgestone, which prompted me to look up for the cause !!
Its like there is a 225 spec tyre in the Stepney bay, instead of 215, which it actually is !!