What is the circumference of a 27.5 tire?
2 Answers
27.5 tire refers to the diameter of the wheel rim. The circumference of a 27.5 wheel set is 2115 millimeters. Notes for using a cycling computer: 1. Installation: When installing the cycling computer, ensure the reed switch sensor is within the magnetic field range of the permanent magnet when they are closest. The distance should be as close as possible without causing collision between the reed switch sensor and the permanent magnet. 2. Protection: When cycling outdoors, remove the computer when leaving the bike to minimize sun exposure and reduce the chance of loss. Most cycling computers are splash-proof and can be used in rain, but it's recommended to wrap an additional layer of cling film or plastic bag. Remove the computer when washing the bike and avoid using high-pressure water jets. 3. Regular inspection: Periodically check the distance between the sensor and magnet to prevent errors caused by accidental collisions. Always ensure road safety before looking down at the computer, and avoid prolonged viewing in crowded or heavy traffic conditions to ensure riding safety.
As a frequent bike commuter, I've used several 27.5-inch mountain bike tires. Based on actual measurements, the most common 2.1-width tires have a rolling circumference of approximately 2180mm when mounted on wheelsets. This was the value I used for my last bike computer calibration. However, if you're using wider 2.4 tires, such as those professional off-road models, the circumference could exceed 2230mm. The key is to check the exact specifications printed on your tire sidewall – rim width and tire pressure can also cause circumference variations of over 10mm. For bike computers requiring precise data, I recommend using GPS to measure an actual ride for greater accuracy.
