Bike size charts

Frame size for adults and wheel size for kids, each with a calculator and the charts it is built from.

Bike sizing

Bike size chartRoad, gravel and mountain frame size from height and inseam Kids bike size chartWheel size from inseam, height and age Bike helmet size chartHelmet size from head circumference, adult and kids

Which measurement to use

Inseam is the most reliable measurement for kids' bikes, and a useful second check for adults. Adult charts start from your height. If the two point to different sizes, take the smaller (BikeRadar). Measure your inseam with the book method: shoes off, book between your legs, floor to the top of the book.