i went to my local tire shop... was gong to put on some winter tires... they want to charge me to change my valves .. they said that i have tire montoring system and these need to be changed when i change my tires .... i know from the past with reg rims they told me the same but i never did them... but do i nned to have this done with this system,,, i never had a car that had this so this is new to me... thanks