Road Bike Stem Angle Chart

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. 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. The rise angle of stem from fork to bar has quite a large effect.

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So the formula is.

Road bike stem angle chart. 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. For example a bike is measured and the angle from vertical is 18 degrees. A shorter stem will result in snappier steering a longer stem will produce slower steering. If you need a stem length beyond those extremes your bike frame is the wrong size.

As a rule of thumb on a road bike you shouldn t run a stem much shorter than 90mm or much longer than 130mm. For a standard 73 fork angle a 17 will end up being level with the ground. This means the. The stem rise refers to the stem s angle in degrees relative to the fork steerer tube and affects bike positioning and reach.

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. Adjusting the stem length can be used to tailor the. Riders like to get a long small and aerodynamic position of the bike e g spirited racers can choose for a longer 1200 mm stem for optimum stretch. Stem length affects handling.

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. In depth the most significant thing while choosing a road stem is the length of the stem may be the key factor for overall fit of the bike. This 90 degree angle applies to road bikes touring bikes spinner bikes and stationary bikes such as the lemond revmaster. The road bike racer typically has the top of the handlebars below the seat height.

Comfort should be your guide when adjusting the height of the handlebars. Measure handlebar back x and handlebar top y. Changing the stem length not only impacts your fit and comfort it affects the handling dynamics of a road bike. A zero rise stem for example is essentially straight while a stem with a rise of 10 has a 10 angle between the steerer and handlebar clamp areas.

Stem angles sloping upward are recorded as positive numbers while stem angles sloping downward should be recorded as negative numbers. 9 top tips for setting up your new road bike. Sanity check the resulting fork rake for most road bikes it should be in the range 40 to 50mm. It is possible to measure the manufacturers angle by taking the stem angle and the quill steering column angle.

The stacks can easily be measured.