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Discussion Starter #1 (Edited)

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They're run-flat tyres though - require a pressure sensor to be fitted as well (to be safe).
 

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They have stiffer sidewalls to maintain the profile of the tyre after a puncture - however because of this it is unlikely you would know you had a puncture until it became dangerous - hence the need for the pressure sensors. The stiffer sidewalls also tend to reduce the ride quality and transmit more road noise into the car.
 
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