About this project

Earlier tools such as cycle-ergo.com demonstrated how useful a rider-triangle visualization can be. Rider Height is not affiliated with or a continuation of that service.

This project focuses on a broader planning workflow: responsive comparison, adjustment previews, shareable assumptions, field-level evidence, and visible data confidence. The aim is to help riders decide what to inspect and test, not to certify a purchase from a screen.

The catalog combines fields with different evidence levels. Confidence belongs to the underlying measurements and rider contacts; one published specification does not make a whole bike verified.

1. Published specifications: where available, seat height, wheelbase, weight, and wheel sizes come from OEM pages and manuals or other public reference sources. Bike pages expose the recorded source and verification state for populated geometry fields.
2. Category-based provisional contacts: most catalog bikes combine published dimensions with category-derived estimates for the seat, handlebar, and peg contact points. These support broad discovery, but they are not measurements of that exact model.
3. Photo-calibrated estimates: a smaller set uses manually calibrated side-profile imagery and a known bike dimension to estimate rider contacts. Calibration improves the model input; it does not make those positions precise or fully verified.
4. Reviewed community contributions: riders can submit measurements, corrections, and supporting evidence. Contributions are reviewed before they can affect the simulator; there is no automatic promotion rule. Fully verified status is reserved for bikes whose relevant evidence has completed review.

Current public-beta status: 0 fully verified bikes and 40 partially verified bikes. The rest of the catalog remains estimated. Each bike page shows its current geometry confidence and available field evidence.

Your body is treated as a chain of segments — thigh, shank, torso, upper arm, forearm — whose lengths are derived from your height and inseam using standard anthropometric ratios (Drillis–Contini). The simulator places your hands at the handlebars and feet at the pegs, then uses inverse kinematics to solve for the rest of your pose.

The numbers reported next to the side view — knee angle, hip angle, elbow angle, torso lean — are modeled interior joint angles from that solve, not measurements taken on the rider. They're classified by rough product thresholds so you can compare the same assumptions across bikes.

The core posture solve remains a simplified side-view model even when it is shown in the interactive 3D scene. Seat-position bias and arm straightness are approximations; lean, suspension sag, body-weight distribution, mobility, and rider gear are not fully modeled. Use the result to compare assumptions, then confirm them on the actual motorcycle.

Your fit settings — including height, inseam, and adjustments — are stored in your browser and encoded into personalized simulator URLs so they can be bookmarked or shared. Those URLs are not private: they can appear in browser history, hosting or CDN request logs, and any service or person you share them with.

Rider Height's application-controlled analytics pageviews omit query strings and fragments and redact shared-profile tokens. Fit funnel events send bike identifiers and counts, not your height or inseam. If you do not want to disclose your measurements, do not share a personalized link and clear Rider Height's local data from your browser.

If a bike's measurements feel wrong — your knees are crammed where they shouldn't be, or the bars are unreachable when you know they aren't — please tell us. A correction form is now available on bike detail pages for signed-in riders, and submitted fixes go through an admin queue before they affect the simulator.