700x23c

700x23c is a traditional bicycle tire size most commonly associated with road bikes. In this labeling, “700” refers to the approximate overall outside diameter of the tire, “23” indicates the tire width in millimeters, and the “c” is a historical letter from the French sizing scale. In modern standards, the same tire typically corresponds to an ISO/ETRTO size of 23-622, where 622 mm is the bead seat diameter of the rim.

The actual compatibility depends on the rim and frame. Tires labeled 700x23c are designed for rims with a 622 mm bead seat diameter (often called 700C wheels). They are commonly used on road bikes with relatively narrow tires and frames that can accommodate a 23 mm width. When selecting tires, riders must ensure the width fits the rim’s internal width and the frame’s clearance, especially under brake calipers and around any fenders or mudguards.

Modern tire offerings frequently use ISO sizing (such as 23-622) and feature a range of tubed, tubeless, and tubeless-ready options. While 700x23c remains a familiar label, many riders today opt for slightly wider tires (such as 25-28c) for improved comfort and puncture protection on contemporary road bikes. In practice, checking the exact bead seat diameter and compatible width range is more reliable than relying on the traditional 700x23c designation alone.