The Rosier is a col located in Stoumont, in Belgium’s Wallonia region. It can be climbed from Spa in the north, where riders use the steady climb to test their legs in what’s known as the “Rosier Test.” Or you can climb it from the east, like the pros who race in the Liège-Bastogne-Liège classic.

That’s what Zwift’s portal segment is based on, and from this side, the climb is shorter and significantly steeper!

Here’s the IRL segment: