Howto find the right-size tyre for your mountain, road, gravel or hybrid bike Thestandard size for a road bike tire is 700c x 23mm. The “700c” is a reference number and a relic from an old French tire sizing system that refers to the outer diameter of the tire. A 700c tire fits on a wheel with a bead seat diameter of 622mm. These days, bicycle tire manufacturers continue to use this reference code, followed by the Thedifference between 27.5 inches and 700c's is (literally) 1.5 mm's. 161.75 to 16×2.125. If you are out to get something that is more on the adventurous side then here is an elaborate size chart based on ISO guidelines. ISO (mm) Size (Inches) Suitability. 599. 26×1.25, 26×1.375. Very old American lightweight bikes. 584. Mostnew bikes are made with a 700c wheel. However, 650b and 27.5-inch wheels are becoming increasingly popular as well. The diameter of a 700C tire is 622mm, whereas a 27″ wheel has a diameter of 630mm. This is a 0.1″ difference in radius, which means the brakes need to reach four millimeters farther to work. Furthermore the 700C large-diameter tires offer excellent traction and stability on this type of terrain. It’s easy to achieve a fast descending speed. Additionally, the Surly Bridge Club Black, 700c is equipped with hydraulic disc brakes and 160mm front and rear rotors, ensuring reliable braking performance and safety during descents. Mar9 2023. |. Feature. There are a dazzling array of numbers that confront mountain bikers but one of the most important numbers is wheel size. Although the choice is quite narrow Thereason why the racing tires are faster isn’t the size of the wheels they are mounted on, it’s their supple casing. And if you made a 650B tires with the same supple casing, it would be just as fast. (We’ve done it and tested that, too.) A 700C x 28 wheel has the same diameter as a 650B x 48 mm, so the angle of attack will be the same HWjk.