The Complete Fit Target Matrix
Every rider is different. Even with identical body dimensions, muscles, ligaments, power, endurance, and flexibility create a unique Biomechanic Profile. BikeSPEZL uses Biomechanic Dimension Capture (BDC) — dimensions measured from the Rotational Center of Joints (RCJ) — as the foundation. But dimensions alone aren't enough. You need to know what angles you're aiming for.
What are Fit Goals?
Each rider has preferences and goals for why they ride. Whether commuting, touring, mountain biking for fun, long gravel rides, or sportive road races — the goals are different. One rider wants comfort and scenery; another wants maximum distance or raw speed.
The five Fit Goals are:
What are Fit Targets?
Fit Targets are the exact joint angles a fitter aims to achieve. They are the bridge between the BDC dimensions and the final riding position. A complete matrix of Fit Targets is needed to achieve each Fit Goal for each bike type.
The seven Fit Targets:
Select a Bike Type
Quick Reference: All Bike Types
| Bike Type | 🔄 Endurance | ⚡ Sprint | 🛋️ Comfort | ⛰️ Uphill | ⛰️ Downhill |
|---|---|---|---|---|---|
| 🚴 Road | |||||
| 🪨 Gravel | |||||
| 🚵 MTB Hardtail | |||||
| ⛰️ MTB Fully | |||||
| 🏁 Cyclocross | — | ||||
| 🏙️ Urban | — | — | |||
| 🧳 Trekking | — | — | |||
| 📦 Cargo Long John | — | — | |||
| 📦 Cargo Long Tail | — | — |
Values shown are Body Angle (torso vs. horizontal). Click a cell to see the full fit target matrix.
What is a full Biomechanic Profile?
To understand biomechanics you need to understand the dimensions of a body, mobility, power, endurance, and how they relate to each other. BDC captures the dimensions — but a full Biomechanic Profile goes further.
Why Mobility Matters
Some riders have greater mobility than others, allowing them to reach positions others can't. A contracting muscle can generate power over a larger distance, resulting in a bigger power range. Longer cranks require the muscle to start contracting earlier and faster — the pedal axle covers more distance per rotation, resulting in lower max RPM. Sometimes it's more sustainable to use shorter cranks and higher RPM, lowering muscle intensity and enabling faster active recovery through greater blood flow.
The Complete Picture
- • Dimensions — BDC (height, inseam, femur, shin, arm, torso)
- • Mobility — hip flexion, ankle dorsiflexion, spine flexibility
- • Power — peak force, power-to-weight ratio
- • Endurance — sustainable power output over time
- • Flexibility — range of motion at each joint