In general, seat-post diameters are measured in steps of 0.2 mm and range from 22 to 35 mm. The majority of bikes, especially the higher-end models, have a standard size of 27.2 mm (1.07 in). 25.4 seat posts are repeatedly detected on BMX bikes. Larger diameters, such as 30.9 mm, are sometimes utilized in contemporary bicycles with sturdier alloy or carbon tubing.