@REI-BryanV thank you Bryan. I appreciate your response. What's the thinnest tire that can go with my existing rims on the Cannondale Quick CX3 ? I think the width of the existing Maddux rim on my bike is 24 cm, and my existing tire is 40mm wide. With the stores closed, I will have to buy the tire/tubes online, and install it myself. If they don't work, then I'll have to return (which I am trying to avoid).