i need to know if there is alot of difference in the actule tire size 180-55-17 between brands ? i had michelin's on my 92 and it fit fine whan i replaced it with the same size dunlop it dident fit so well it rubbed my chain or my brake arm. so is there alot of difforence in all the brands or was that just a fluke thing ? to be on the safe side i went bacl to thestock size 170-60-17 d207 but i dont feel as comfortable on the smaller tire what can i do?