Before buying
Validate size.
Stack.
Reach.
Geometry.
Saddle.
Compatibility.
BIKEFINDER 3D · GURU
Smart bike purchasing.
BIKEFINDER 3D with GURU technology validates size, geometry and configuration through real-time dynamic biomechanics to reduce costly compatibility mistakes.
Two decades of applied cycling science.
Smart purchasing with GURU
Compare geometries before committing your investment.
The GURU system explores positions, geometries and adjustment ranges before a bicycle is selected. The recommendation considers your body, intended use and probable setup, not only a size chart.
- Format
- On-site + prior online review
- Estimated duration
- 1.5 to 2.5 hours
- Deliverable
- Size, geometry and initial setup report
Flagship service · BIKEFINDER 3D · GURU
Simulate before investing.
BIKEFINDER 3D uses GURU Ultimate 3D to modify coordinates and explore geometries while the cyclist pedals. It does not provide an isolated size: it builds a dynamic compatibility reading and a realistic adjustment range before purchase.
Characterize the rider
Functional range, strength, discipline and intended use.
Map the geometry
Stack, reach, cockpit and possible configuration range.
Validate the decision
Target position and probable setup before paying.
REAL-TIME COMPATIBILITY MAP
Body, geometry and target position in one view.
Body
Functional range
Geometry
Stack + reach
Outcome
Probable setup
BIKEFINDER 3D · GURU
You do not buy a size. You buy compatibility.
A size chart provides direction. Simulation reveals whether a geometry can support the position your body and purpose require.
After buying
Adjust setup.
Understand limits.
Optimize position.
Reduce adaptation errors.
SADDLE COMPATIBILITY
The right fit goes further.
Shape, width and support should match your anatomy, position and riding style. BIKEFINDER 3D validates that compatibility before recommending.
Comfort, control and performance start at the contact point.
CONTACT MAP
Geometry simulation01Shape
02Width
03Support
The problem with size charts
Buying a bicycle by size alone can be expensive.
- Two bicycles with the same labeled size can feel completely different.
- Reach, stack, cockpit, setback and geometry change the real adjustment range.
- We do not look for a generic size. We look for compatibility.
Size does not tell the whole story. Geometry determines much more.
What we assess
- Body measurements and functional range.
- Discipline, goals and intended use.
- Probable bicycle geometry.
- Stack, reach and adjustment range.
- Cockpit, saddle and contact points.
- Compatibility between rider, bicycle and purpose.
What you receive
- More precise purchase criteria.
- Sizes or geometries with stronger compatibility potential.
- Alerts about models that may restrict adjustment.
- Initial configuration recommendations.
- A recommended next step before investing.
Who it is for
- Riders buying a new or used bicycle.
- Cyclists deciding between two sizes or models.
- Athletes who want to validate a bicycle before paying.
- Riders with previous sizing or geometry problems.
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.
What it costs and what it saves you.
It is the smallest investment in the whole purchase, and the only one made before the mistake becomes irreversible. The wrong size is not fixed with a different stem: it limits your position for the entire life of that bike.
Investment
from USD 200approx. $ 630.000 COP
- Everything in the position study: ISAK Level 2 anthropometry, VALD DynaMo Plus dynamometry and 3D motion capture.
- Your optimal coordinates defined before looking at a single bike.
- Comparison of specific models, sizes and geometries on the simulator, using the GURU Virtual Warehouse.
- Stack, reach and adjustment margin read for every candidate.
- Report listing the compatible bikes and the discarded ones, with the reason for each.
If you buy from the study and then need to fine-tune the position on the assembled bike, that transfer is covered: you do not pay twice for the same work.
Frequently asked questions
Before buying your next bike.
What is a pre-purchase bike study?
An assessment done before you pay, to establish which size, geometry and configuration are most compatible with your body, discipline and goal — whether the bike is new or second-hand.
Does it just tell me a frame size?
No, and a letter on its own would not be much use: two bikes labelled the same size can feel entirely different. The study compares stack, reach, geometry and remaining adjustment range across the specific models you are considering, and flags the ones that would box you in.
What do I actually walk away with?
Your position coordinates in stack and reach, independent of any brand; the sizes and geometries that fit you among the models on your shortlist; the models ruled out and the concrete reason why — too little adjustment range, excessive reach, a forced cockpit; a starting configuration for stem, saddle setback and spacers; and a document with those numbers to take to the shop or the seller.
Do I need to own the bike first?
No — the whole point is to assess before buying. Send the brands, models, sizes and geometries you are weighing up beforehand so the comparison can be prepared.
Does it help with a second-hand purchase?
Yes, and the stakes are higher there: on the used market there are no exchanges or returns, and the supply is whatever appears rather than what suits you. With your coordinates you can judge a listing in minutes instead of deciding from a photo and the size in the ad.
What if the compatible bike is beyond my budget?
That is a common outcome and useful information in itself. Knowing your coordinates lets you look down the range deliberately: which lower-tier models reproduce the same position, how much adjustment range they keep, and which components would need changing. The alternative — buying what you can afford and hoping it fits — is what usually ends up costing more.
Does this replace a bike fit after buying?
They are related but different. The pre-purchase study decides which bike you fit on; the fit afterwards finishes adjusting that bike to you. The usual sequence is pre-purchase before paying and the fit once the bike is built.
Protect your investment before buying.
Buying well starts before paying. BIKEFINDER 3D with GURU technology turns measurements, geometry and dynamic simulation into compatible options and a clearer initial configuration.