It will not protect or repair a shredded tyre at 03.00am on wet night in the middle of nowhere as happened to me in hire car..
Bro-in-law has had two tyre failures this year; his nice new Renault Megane is blessed with pressure sensing tyre valves and a can of foam instead of any spare wheel.
He found the foam useless for the first incident, large split in sidewall. Second time was Bank Holiday Monday, replacement tyre not in stock, so not fixed till Tuesday.
" No spare " cars seem to be a triumph of marketing over common sense, what can you put in the space a spare would occupy which is more useful?
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