Loss of tyre pressure

[robby boy]

Personally I would not recommend putting tubes in, if you get a nail in the tyre it will deflate at a much higher rate with a tube and if that happened on a spirited ride going into a corner who knows where you might land, I would check the valve stem where it comes through the wheel, if no leak there try round the rim and round the tyre, use warm water with a dash of fairy, (warm water sticks to the rubber and does not run off like cold) if it is round the rim clean all corrosion off and use the liquid rubber like others have already said.