
No More Guesswork
Streamlines bring cyclists precise & practical aero measurement technology to eliminate the guesswork
Our Vision
We do not want to just to measure a cyclist's drag, but to combine knowledge of body position and drag to allow riders to cycle faster and more efficiently. We also want users to have a seamless experience when using our technology, including during the post-ride data analysis. That is why we have taken great care in making our products user-friendly all-around; hardware and software.


FORMA Body Position Sensor
FORMA Body Position Sensor
$555.00
The FORMA makes it easy to train and race in your ideal aero position. This body position device mounts on the cockpit of the bike and connects with Garmin bike computers. Infra-red lasers measure riders' head and chest distance and the deviation from their reference (ideal) aero position is shown in real-time via an app installed in the bike computer. Post-ride data can be viewed via FIT file.
Technical Specifications:
- Weight:40g
- Dimensions: 46.5 x 69 x 29mm
- Battery life: rechargeable Li-Ion battery, 6 hours uninterrupted
What's on the Box:
- FORMA sensor
- USB-C charging cable
- EVA protective case
Product Information:
The FORMA is mounted on the cockpit on the bike using a 1/4 turn mount. Some TT and triathlon cockpits may require a bespoke mount, which we can provide (please contact us at support@streamlines.aero).
For further information, such as user guide and software please see our Resources section.
PLEASE NOTE: The FORMA requires a bike computer to record and display ride data. At present the FORMA is only compatible with Garmin bike computers. Please see FORMA DF in the Connect IQ store for compatibility.
If you are not purchasing a mount through us, you will also need a female quarter turn mount.
Shipping and duty charges
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Shipping and duty charges
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All shipping and duty charges have already been included in the price of the item.
FAQ
Why would I want a body position sensor?
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Why would I want a body position sensor?
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Since over 75% of a rider's drag comes from the position of their body, changing one's body position is the largest and most inexpensive performance increase a cyclist can make. For competitive triathletes, a difference of 1 cm will cost about 30 seconds over a 1-hour bike course. A difference of 4 cm will cost 40 watts and 2 minutes in time over the same 1-hour course. Maintaining a steady position while cycling is difficult. The position can drift due to fatigue over the course of a ride. It can also drift over a period of weeks and months if it is not being periodically checked. We have worked with world champions and grand tour winners, everyone drifts with fatigue, what can be reduced is how much.
I don't have an access to a wind tunnel, how can I know what position to be in?
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I don't have an access to a wind tunnel, how can I know what position to be in?
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For simplicity, we will divide aerodynamic cycling positions into two divisions: Moderate – Rider’s upper back is higher than their mid-back. Maximises speed and endurance. Maximal – Rider’s mid back is the highest point, upper back is lower. Maximises speed. Every cyclist intuitively knows that lowering their chest and head improves their aerodynamics. What is happening is that the cyclist is both making themselves smaller (less area when viewed from the front) and improving their shape. Once a cyclist has moved from the moderate to the maximal position, they are no longer decreasing their frontal area by going lower. Their drag may decrease further through improving their shape, but these improvements will be much smaller. Every cyclist will also intuitively know that going lower starts reducing power and increasing fatigue, so there are some large drawbacks to going lower. Most riders who maintain a low position in races, train extensively in that position to be able to maintain it in a race, especially while fatigued. The FORMA can accelerate this training process by providing precise feedback and records, so a rider can position themselves precisely in training and racing. Moderate Position For any cyclist whose position lies in the moderate division, a lower position will almost always reduce drag. A crude but useful rule of thumb is 0.01 CdA for every 2cm, for a cyclist travelling at 40 km/h, this will be the equivalent of about 10 watts of power. As a rider’s position lowers, the power in their legs will also decrease. A rider will need to experiment with going lower to see at what position their power drops or they become uncomfortable. A FORMA allows a rider to experiment with positions while stationary or on a turbo trainer, and then confidently maintain that position over time while training and racing. Maximal Position A cyclist in the Maximal division will not benefit much from going lower, however their aerodynamic performance will decrease as they raise their position. Riders using such a position have usually been aero-optimised by a fitter, aero test, or by experimentation. It is not worth lowering a rider, closing their hip angle and decreasing power, if the lower position does not lower drag. Here the role of the FORMA is important in ensuring that when the rider trains or races they keep the same chest and head position as their optimum, not lower, and not higher.
Will the FORMA fit on my bike?
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Will the FORMA fit on my bike?
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The FORMA can be easily mounted on most bicycles. Road bikes: you can fit a standard 1/4 turn mount to the stem or handle bars of a road bike. TT bikes: Any aero extension setup that allows a quarter turn mount between the riders forearms. On twin pillar aero extensions it can be difficult to get a 1/4 turn mount between the rider's arms. In this case please contact with Streamlines at support@streamlines.aero as we have a variety of mount solutions available.
How long does it take to set it up before it can be used?
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How long does it take to set it up before it can be used?
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With a guide laser and screw adjust, aligning the FORMA to the rider is easy. The adjustment screw mechanism is spring-loaded to ensure it always returns to its aligned position should it be bumped or nudged during use. Once aligned, the rider then holds their ideal position for several seconds as the FORMA software records the rider's reference position. From opening the box, to riding with visual feedback, the setup can all happen in less than five minutes.
How accurate is the FORMA?
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How accurate is the FORMA?
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The FORMA reliably measures head and chest position within +/- 2mm. In addition, the waist range sensor can detect whether a rider is sitting in the saddle or standing upright.
How do I view my data?
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How do I view my data?
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While riding, the rider position can be viewed through a Garmin Data Field or the FORMA CIQ app. After the ride, the rider position can be viewed in Garmin connect, or in the Cirrus portal.
News
In-depth review of the FORMA by the5krunner
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Read a detailed review of the FORMA body position sensor by the author of the5krunner blog here
September 2023: Cycling Industry News
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Another nice article on the FORMA, by Cycling Industry News: "Streamlines’ FORMA Sensor to shake up body position optimisation" Read here
August 2023: Road CC - Could this tiny sensor help you ride faster?
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An article published by Road CC following the official launch of the FORMA body position sensor. Read the entire article here
July 2023: Escape Collective Tour de France Time Trial
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A geeky article on "Optimising for the stage 16 time trial" with the contribution of a simulation run by Streamlines founder, John Buckley. https://escapecollective.com/optimising-for-the-stage-16-time-trial/
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Contact
info@streamlines.aero
sales@streamlines.aero
+44 (0) 1865 679911
About us
Our vision is not just to measure a cyclist's drag, but to combine knowledge of body position and drag to allow riders to cycle faster and more efficiently