A brushless motor is used in the "fumpas", the mini compressors that put up to 8 bar into a racing tire. The "mini fumpa" version is so small that it fits in the back pocket of a jersey - although you would hardly want to ride around with an angular little block near your spine. The compressor is powered by a rechargeable battery, which is supplied with power via a USB port. On board is a pressure display in psi or bar. Anyone shaking their head at this mini-compressor can at least think about the waste of resources caused by C02 cartridges.

www.fumpapumps.com