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what is the worst that can happen by putting a 28c tyre on a 19mm width rim ?
You won't feel the benefit.
Nothing truly terrible happens if you observe the pressure limits set by both tyre and rim manufacturers, but you may end up not being able to find a pressure which gives both good ride and good handling. Set it low for good ride, and the handling goes squirmy, set it high for good handling and the ride goes to boneshaker.
right , what is the worst that can happen by putting a 28c tyre on a 19mm width rim ?