Measure the bike frame size from the center of the bottom bracket to the top of the seat tube
Measure the top tube length from the seat tube to the head tube
Measure the seat tube length from the bottom bracket to the top of the seat tube
Measure the standover height from the ground to the top of the top tube
Measure the wheel size by checking the tire or rim diameter
Measure the wheelbase from the center of the front axle to the center of the rear axle
Measure the handlebar width from end to end
Measure the stem length from the center of the steerer clamp to the center of the handlebar clamp
Measure the crank arm length from the center of the bottom bracket to the center of the pedal axle
Measure the saddle height from the center of the bottom bracket to the top of the saddle
Measure the bike’s overall length from the front wheel to the rear wheel
Measure the bike’s weight using a scale