How to Measure a Mountain Bike: A Guide to Accurate Sizing
To measure a mountain bike, start by measuring the length of the seat tube from the center of the bottom bracket to the top of the seat tube. This will give you the bike’s frame size. Then, measure the distance from the top of the seat to the center of the handlebars to determine the bike’s reach. Next, measure the distance from the center of the crankset to the top of the seat tube to find the bike’s stack height. Finally, check the wheel size, which is typically 27.5 or 29 inches for mountain bikes.