Wow, not heard of them being supplied as standard. What's the ride like? My only experience was in a friends BMW 1 and they made the ride awfully hard.
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First time experience for me as well actually didn't know they were run flats until changing wheels, of course they should be harder than normal tires but ride is still acceptable, the wheel shop also told me that these Bridgestone run flats seemed to have softer sidewall.