The Frame is the Foundation of the Bike
A materials strength relates to its behavior when subject to stresses and strains.
- Stress - internal distribution of forces within a body.
- Strain - the deformation of a body caused by an applied stress.
Young's Modulus is a measurement of the stiffness of a solid material.
Metallurgy of the tubes, wall thickness, cross-sectional shape, and size all influence performance. The goal of designing a good bike frame is to put the appropriate amount of material where the bike frame undergoes the most stress—at each end of the tubes. This process is known as butting. The result is a tube with a thin-walled central section and thicker-walled ends.
Frame GeometryFitting a Bike to be an Extension of Your Body
The length of the tubes and the angles at which they are attached determine bike size and fit. Each person has a unique set of measurements—a bike must fit the upper and lower body geometry to be a good fit.
To use your muscles effectively, a bike must properly fit your anatomy.
Bike Fit Measurements
Reach & Setback
A few of the key measurements for bike fit include:
The saddle should be positioned such that there is a slight bend in your knee at the bottom of your pedal stroke.
The handlebar should be positioned such that there is a slight bend in your elbow and your back is flat or gently curved.
When the pedals are level, your knees should be in line with the pedal spindle.
Frame CompositionUsing the Properties of Elements to Construct Better Frames
Composition: The elements used to create a bike’s frame affects its weight, cost of production and vibration damping.
What is your bike's frame made of?
Most are comprised of metallic alloys, or combinations of different elements. These alloys are often stronger, lighter, and more durable than pure metal elements.Three of the most common materials used for bike frames are STEEL, ALUMINUM, and CARBON.