MotoGP remains a prototype racing series, despite the increasing use of spec components. In 2009, MotoGP switched to a single tire supplier, a spec ECU in 2014, and spec software in 2016. Bore and stroke, and the number of cylinders are specified, meaning that all six manufacturers in MotoGP use four-cylinder 1000cc engines with an 81mm bore.
Despite the fact that so much of the rest of the bike design is unregulated, some components become almost de facto spec. The choice of brake component suppliers is completely free, and yet every MotoGP bike on the grid is fitted with parts that come exclusively from Brembo, the Italian brake manufacturer which dominates the sport, on both two wheels and four.
At Brno, I had the chance to talk to two people with intimate knowledge of Brembo's braking components: Andrea Pellegrini, chief engineer for Brembo inside the MotoGP paddock, and Santi Hernandez, crew chief for world champion Marc Márquez in the Repsol Honda team. Pellegrini provided the perspective from the side of the brake manufacturer, while Hernandez gave an insight from the end users' point of view.
New tires, different braking styles