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Yes, Yes, Yokohama ZPS (runflat) tyres require extended hump rims in order to work. When flat Yokohama can be driven upto 80kmh for no more than 80kms, and Yokohama instruct not to repair theirs after having been driven on flat.

Sorry, you are right. Runflat tyres can be fitted to a standard rim. But is not recommended. They will not function as a runflat. Dedicated runflat rims have an extra extended hump/lip which acts as a bead lock to ensure that the heavy reinforced sidewall's bead of the runflat tyre remains...

Runflat tyres require a special/different type of rim. It is not possible to fit runflat tyres to standard rims.