Tire switcheroo: In preparation for an off-road adventure, we replaced our street tires with some knobbies. Tires: Heidenau Tires // Street: K28 // Knobbies: K67 // (Ask your dealer for their thoughts on load and speed ratings.) http://www.HeidenauTires.com Bike: This is one of our 1WD sidecars, a 2016 Ural Motorcycles cT. http://www.imz-ural.com Results: In mud and rocks and mucky surfaces, the K67 trials-type tires did incredible. In places we thought we'd be stopped, the torquey Ural and knobby-tire combo impressed us. Video: http://www.GoodSparkGarage.com Music: "Jack" by Podington Bear - http://www.soundofpicture.com