It is the name that started a whole new way to motorcycle, and it is turning 40-years-old this year.

The iconic “GS” (short for Gelände/Straße) is a category defining series of motorcycles from BMW Motorrad, and to celebrate its birthday, the German brand is releasing a flurry of special edition middleweight models.

The unique BMW F750GS, BMW F850GS and BMW F850GS Adventure models are easy to spot with their special yellow and black livery, but the Bavarians have also packed a few features into these machines to help them party.