These E.M.S will often have been programmed to monitor tyre overall diameters and will pick up the differential if the new tyre/s exceed specifications. Why? Many newer vehicles have engine management systems installed. WHEN FITTING DIFFERENT TYRE SIZES TO SPECIFICATION, CONSULT YOUR VEHICLE SPECS WITH RESPECT TO ON-BOARD COMPUTER (E.M.S) (Should the tyre width be narrower than the rim width, the reverse of the above will occur). Sudden air pressure loss may also be experienced. The third problem being the bead of the tyre will not seat or seal itself correctly onto the rim and this can cause "bead rock" or chaffing of the bead of the tyre, against the rim flange. The second visible fault are the side walls of the tyres will not "stand straight" and will lean in from the shoulder of the tyre relative to the bead flange, which seals the tyre to the rim. The first is the tread of the tyre will distort to the extent that the tread will not be able to make proper road contact across the tread area. Why? Should the tyre width exceed the width of the rim width, three major faults will occur. ENSURE, WHEN FITTING WIDER, LOWER PROFILE TYRES, TO EXISTING RIMS, THAT THE RIM AND TYRE WIDTH ARE COMPATIBLE.
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