How To Measure A Bike Frame. Take a tape measure and reach over the frame from one handlebar to the other then take that measurement up to where it meets the top tube. When you measure bike frame size you should start from the middle of the tool crank to the upper part of the seat tube.
Most manufacturers now measure the frame from the centre of the crank axle to the top of the seat tube. When you measure bike frame size you should start from the middle of the tool crank to the upper part of the seat tube. The seat tube is the vertical part of the triangle of the mountain bike that the frames form.
The seat tube is the vertical part of the triangle of the mountain bike that the frames form.
Most manufacturers now measure the frame from the centre of the crank axle to the top of the seat tube. The measurement varies in a mountain bike since most have a slanted top tube. To measure the height of yours stand the bike upright and measure from the ground up to the centre of the crankset. What youll need to measure a bike frame.