InflaTube

The tubes in bicycle tyres leak air slowly; replenish tyre pressure on the go with INFLATUBE. This is a small plastic reciprocating pump that can be put right inside the tube, with just a few millimetres of travel and maybe a cubic centimetre or so of capacity. the pump is squeezed and released when it reaches the lowest point in the course of rotation of the wheel. The travel of the pump would be close to, but slightly greater than, the expected distortion of the tube at its lowest point when properly inflated.

Source: halfbakery.comAdded: 20 January 2006