The difference between Volvo B9R and Volvo B11R primarily lies in engine size, with the B11R featuring a more powerful 11-liter engine compared to the B9R’s 9-liter engine. Additionally, the Volvo B11R is longer at 15 meters, while the B9R measures 13.7 meters. A key difference between Volvo B9R and Volvo B11R is the axle configuration – the B9R is equipped with a pusher axle positioned before the main drive axle, whereas the B11R features a steerable tag axle located behind the drive axle.
