Depending on the type of bike, size is determined either by the size of its seat tube or top tube. To figure out the correct bike measurement, users must first determine if they are measuring a mountain/road bike or a BMX bike.Continue Reading
Mountain bikes and road bikes are measured in the exact same way: by determining the length of the bike's seat tube. This is the standard measurement for both types of bikes regardless of whether the tube is one continuous piece.
BMX bikes, on the other hand, come in two frame styles: freestyle and racing. However, they are both measured in the same way, namely by determining the length of the top tube.