Schoberer Rad Meßtechnik (SRM), or Schoberer Rad Messtechnik, is a company which created the first mobile ergometer for bicycles. Formed in 1986 by Ulrich Schoberer, the name literally means "Schoberer’s bike technical measurement." The SRM Powermeter uses built-in strain gauge

Strain gauge

A strain gauge is a device used to measure the strain of an object. Invented by Edward E. Simmons and Arthur C. Ruge in 1938, the most common type of strain gauge consists of an insulating flexible backing which supports a metallic foil pattern. The gauge is attached to the object by a suitable...

s to determine the power, in Watt

Watt

The watt is a derived unit of power in the International System of Units , named after the Scottish engineer James Watt . The unit, defined as one joule per second, measures the rate of energy conversion.-Definition:...

s, that the cyclist outputs to the bicycle cranks and chainring.