My reluctance to stay verticaly aligned with the bike is psychological. I had no trouble staying with the bike with the 20x1.5 OEM tires, or on road bikes with 700x22 tires, but with the Stelvios, I've just entered a new, significantly faster, realm. The Stelvios are "28.6 mm" (1-1/8"). I'm in the 20x1-1/8 adjustment period.