BIKEFIT 3D · GURU
Real-time biomechanics under load.
BIKEFIT 3D with GURU technology studies body, force and movement while you pedal, modifying position on the move to observe comfort, stability and power response in real time.
Two decades of applied cycling science.
In-lab BIKEFIT
Adjustment observed while you pedal.
Dynamic capture links movement, load and position while changes are made on the move. Each adjustment can then be documented and transferred to the rider's real bicycle.
- Format
- On-site in the laboratory
- Estimated duration
- 2 to 3 hours
- Deliverable
- Complete biomechanical report
The process, step by step
Not a static fit. A progressive biomechanical decision.
Simulate position.
Adjust while riding under load.
Validate response.
Transfer to the real bike.
BIKEFIT IN DETAIL
Position changes on the move. Measurement does too.
We observe the cyclist as a system: posture, contact points, cleats and response to each adjustment while pedaling continues. The process moves from dynamic measurement and laser references to a final test on your own bicycle.
Precision BIKEFIT 3D
A poor position does not always hurt immediately.
It can appear as power loss, early fatigue, numbness, instability or the inability to hold an efficient posture. The goal is not to copy an ideal position; it is to find a position compatible with you.
What we assess
- Current position and contact points.
- Mobility and functional restrictions.
- Force and asymmetries through dynamometry when relevant.
- ISAK anthropometry when relevant.
- Pedaling, stability, saddle, cockpit and cleat support.
- Relationship between comfort, efficiency and performance.
Measuring the body before the bike
Anthropometry and dynamometry, integrated.
A position is fitted to a specific body, and a specific body has lengths, ranges and forces that are not the same on both sides. Measuring that before touching the bike is what separates a study from an adjustment: without those numbers, any asymmetry that shows up in the pedal stroke is read by eye.
Both are measured with protocol and with instruments, not with a tape measure and judgement. Anthropometry follows the ISAK standard, at Level 2 accreditation. Strength and range are measured with a VALD DynaMo Plus.
ISAK Level 2 anthropometry
- Segment lengths per side: femur, tibia and foot. This is what explains why two riders with the same inseam need different saddle heights.
- Bone breadths and girths: biacromial and bi-iliocristal widths drive handlebar and saddle choice.
- Skinfolds to protocol: recorded as a sum, not converted into a body-fat percentage that would carry the equation's error.
- Measured repeatability: the ISAK standard requires a technical error of measurement within limits, which is what makes two sessions months apart comparable.
Dynamometry · VALD DynaMo Plus
- Isometric strength and range in one instrument: dynamometer and inclinometer combined, so force and mobility are recorded in the same test rather than across two sessions.
- Over 400 test protocols with five interchangeable attachments, covering hip, knee, ankle, trunk and shoulder.
- Asymmetry in numbers, not impressions: each side is measured separately and the difference calculated. A 12 % imbalance between legs is actionable; «your right looks stronger» is not.
- Comparable over time: the same battery repeated after a block of work tells you whether the imbalance was corrected or merely compensated.
Externally anchored tests are prioritised over manually resisted ones: it is the configuration with the best documented reliability, and the only one that lets a measurement taken today be compared with one taken six months from now.
What this changes in practice: a strength difference between legs changes which adjustment is appropriate. If the right leg produces 15 % less, raising the saddle «until both legs reach evenly» fixes the appearance and worsens the problem. With the asymmetry measured, the decision is a different one: adjust per side, document the starting point and measure again afterwards.
Test catalogue
fizik Adaptive saddles: tested before you buy them.
The saddle is the contact point that generates the most questions and the one chosen worst, because it is almost always bought blind. The lab keeps the full fizik Adaptive range available to fit and ride during the study: you test the width and shape that came out of your measurement, not the one that was on offer.
The Adaptive range uses 3D-printed padding made by Carbon with digital light synthesis. Instead of uniform foam, the lattice structure is divided into zones tuned to different stiffness: more support under the sit bones, more give along the ischiopubic rami. That is what allows firmness where support is needed and relief where soft tissue sits — something foam cannot do at the same time.
If the chosen saddle is the right one, it is fitted and adjusted in the same session with its height and setback recalculated: a new saddle changes the effective height, and fitting one without redoing that arithmetic is the most common way a good choice ends up hurting.
What gets tested
- Argo family · short nose. For heavily rotated positions, where a long nose presses exactly where it should not.
- Antares family · intermediate profile. The balance between support and freedom of movement for road and endurance riding.
- Two widths per model, to cross against your actual sit-bone measurement rather than a generic size.
- R1 and R3 finishes, which change the rail and the weight but not the support geometry: the comfort decision comes first and the budget one after.
Testing does not commit you to buying. If your current saddle is the right one, you leave knowing it — which is also a result.
What it costs and what it includes.
We publish the figure because comparing blind is what leads to paying twice. A one-hour adjustment and a study that integrates anthropometry, dynamometry, 3D motion capture and follow-up are not the same price because they are not the same thing. With the number in front of you, you can compare scope instead of just cost.
Investment
from USD 170approx. $ 540.000 COP
- ISAK Level 2 anthropometry: segment lengths, breadths and skinfolds measured to international protocol.
- Isometric dynamometry with VALD DynaMo Plus: strength and range of motion per side, with asymmetry quantified.
- 3D motion capture of your pedalling under load on the GURU Ultimate 3D simulator.
- Real-time configuration testing and transfer to your own bike.
- Report with the final coordinates, the starting ones and the reason for every change.
- Follow-up through the post-study adaptation period.
The «from» reflects scope: reviewing an already validated position is not the same work as rebuilding one with a documented asymmetry. Anything that applies to your case is explained before booking, never after.
Frequently asked questions
Questions before booking a bike fit.
What is a bike fit or cycling biomechanical assessment?
An assessment of the rider and their position, so the bike can be adjusted to their anatomy, mobility, discipline and goal. At ONE the analysis is dynamic: changes are made and validated while you pedal under load, not with the bike standing still.
What makes the GURU Ultimate 3D different from a regular fit?
It changes the geometry while you keep pedalling. In a conventional fit every change means stopping, swapping a component and climbing back on, by which point the sensation you were meant to compare has faded. The motorised unit — the DFU, or Dynamic Fit Unit — moves saddle and handlebar under load, so two positions can be compared back to back rather than from memory.
Which measurements are adjusted?
Depending on the case: saddle height and setback, handlebar reach and height, cleat position, foot support, saddle width and any component that constrains the position. The final coordinates are recorded in stack and reach, which are independent of brand and model and can be reproduced on any bicycle.
Does it work for road, MTB, gravel or triathlon?
Yes. The target ranges change with the discipline — more clearance to manoeuvre on MTB, the balance between aerodynamics and sustainable power on triathlon and time trial — but the principles of contact, stability and force transfer are the same. If you have not bought the bike yet, the right order is the reverse: pre-purchase study first, fit afterwards.
How long does the session take, and what should I bring?
Usually two to three hours, including physical assessment, dynamic exploration and transferring the coordinates to your bike. Bring the bicycle as you actually ride it, with your usual pedals and saddle, and the kit and shoes you normally use. Any relevant history helps too: medical or physiotherapy reports, a previous fit, and the discomfort you want solved — including at what point in the ride it appears.
Can I train normally afterwards?
Yes, though it is worth returning progressively. A change of position redistributes load and the body needs a few rides to adapt, so an unfamiliar sensation at first does not necessarily mean the adjustment is wrong. A follow-up is included when the case calls for it.
Where is the laboratory and does the fit work for visitors?
The lab is in Usaquén, Bogotá, at 2,600 m. Cyclists from Europe, Central America and the United States have travelled to be assessed here. The session is on-site because the simulator, dynamometry and anthropometry cannot be done remotely; the resulting coordinates travel with you and apply to any bike you own.
Precision to ride better.
Your position should not force you to compensate. BIKEFIT 3D with GURU technology helps improve the relationship between body, bike, comfort and performance under load.