700x25c

700x25c is a bicycle tire size from the traditional French system. The 700 denotes an approximate outer diameter, and 25 indicates the tire width in millimeters. The letter c reflects a historical width classification. In modern ISO sizing this corresponds to 25-622, meaning a 622 mm bead seat diameter (the rim size commonly labeled 700c).

This size is common on road and endurance bikes that use 700c rims. It fits frames and forks designed for 622 mm rims, but clearance between tire and frame or brakes should be checked, especially with wider tires. Tires of this size are typically clinchers and can be tubed or tubeless where rims and tires are compatible.

Performance characteristics for 25c tires emphasize a balance of low rolling resistance and comfort on paved surfaces. Narrower tires generally roll more efficiently on smooth roads, while wider tires like 25c can offer better comfort and grip on rough pavement and reduced risk of pinch flats. Inflation is usually in the range of about 100–130 psi (7–9 bar), depending on rider weight, tire design, and whether the tire is tubed or tubeless.

Variations and compatibility: many tires labeled 700x25c are also listed as 25-622 in ISO terms. The same rim can accommodate a range of widths within clearance limits; common alternatives include 23c, 28c, or 32c. Tubeless-ready tires require compatible rims and valves, while traditional tubed tires use inner tubes.