Sport riding position ergonomics: reach and angles
For a rider with the default 560 mm torso, 320 mm upper arm, 340 mm forearm, 450 mm thigh, 450 mm shin, 840 mm inseam (about 33 in), the sport riding position (forward & tucked: bar 590 mm forward and 160 mm above the hip, footpeg 50 mm forward and 470 mm below the hip, 810 mm seat height, 38 deg torso lean) models to a 63.4 deg knee angle and 68.8 deg elbow angle, both within geometric reach, and a +30 mm inseam-minus-seat gap. Computed with the Rider Triangle geometry model, method version 1.0.0, reviewed 2026-09-11.
| Control | Value |
|---|---|
| Bar reach from hip | 590 mm |
| Bar height above hip | 160 mm |
| Footpeg forward of hip | 50 mm |
| Footpeg below hip | 470 mm |
| Seat height | 810 mm |
| Torso forward lean | 38 deg |
Modeled result
- Modeled knee angle
- 63.4 deg
- Modeled elbow angle
- 68.8 deg
- Inseam minus seat height
- +30 mm
- Geometric fit band
- 10/100, a strained geometric posture band. Not a comfort or safety measurement.
What the sport position changes
The sport category (forward & tucked) moves the footpeg and handlebar coordinates relative to the hip, and changes the torso-lean assumption used to place the shoulder. Moving the footpeg further forward and the handlebar further forward and lower increases forward lean and can close down the elbow and knee angles for a given limb length; moving the seat lower shifts the inseam-minus-seat comparison without changing arm or leg geometry at all. These are broad editorial planning categories, not specifications for a manufacturer or model, and seat height and control layout vary widely within any one style. The computed angles above use this tool's own law-of-cosines solver against the default rider measurements; change the measurements in the simulator to model your own body.
A knee or elbow angle near 180 degrees is closer to straight; a smaller angle is more bent. An unreachable result means the straight-line distance between the joint endpoints is outside the sum or difference of the two limb segments for that body, not a measurement error. None of this establishes comfort, footing, clearance, or safe control; confirm the real motorcycle in person.