Road Bike Stem Angle Calculator

Stem angles sloping upward are recorded as positive numbers while stem angles sloping downward should be recorded as negative numbers.

Road bike stem angle calculator. Write 0 the number zero for an extension perpendicular to the steerer. Now with handlebar position established we want to check that stem length stem angle stem stack headset spacers stack and headset top stack all match up. For a standard 73 fork angle a 17 will end up being level with the ground. It is possible to measure the manufacturers angle by taking the stem angle and the quill steering column angle.

The calculator above is designed to help fitters trained in the f i s t. Relative to 90 degrees. 17 for a 7 shaped stem. The stacks can easily be measured.

φ 90 θ s where φ is final angle above level θ is you actual fork angle and s is the stem s angle can be positive or negative so for example a 6 degree stem on a 72 fork you will get 90 72 6 12 degrees above level. As a rule of thumb on a road bike you shouldn t run a stem much shorter than 90mm or much longer than 130mm. A shorter stem will result in snappier steering a longer stem will produce slower steering. Walter s bicycle stem rise reach calculator.

Measure handlebar back x and handlebar top y. So the formula is. The rise angle of stem from fork to bar has quite a large effect. Bike fit for road cycling can be complex.

Changing the stem length not only impacts your fit and comfort it affects the handling dynamics of a road bike. Sanity check the resulting fork rake for most road bikes it should be in the range 40 to 50mm. We visited oli beckingsale of bw cycling in bristol to find out more about steam length and reach. Adjusting the stem length can be used to tailor the.

For example a bike is measured and the angle from vertical is 18 degrees. This means the. To calculate the effect of raising a stem add 0 96cm of rise for every 1 0cm of quill or steer tube you expose and subtract 0 30cm of reach. Plug in actual stem pitch.

All contents licensed under a creative commons attribution noncommercial share alike 3 0 license unless noted otherwise creative commons attribution noncommercial share alike 3 0 license unless noted otherwise. Tri bike fit protocol to generate. So to arrive at stem angle add the head tube angle to the extension angle from the chart and you ll have a number that most bike shops can use. 6 for 6 down from perpendicular 6 for 6 up.

If you re considering a change in stem configuration use this tool to calculate the exact change in rise reach from your current stem to your proposed configuration.