What the result actually measures
A wheel reaches the browser as a list of axes with no names. The guided check names them by watching them move: the axis that turns both ways is steering, the one that moves when you press the throttle is the throttle. From there it reads what the signal itself gives away. A quarter turn of the rim moves the steering axis by 180 ÷ the rotation, so it reveals the rotation the wheel is really set to. Every value sits on a grid of the device’s own steps, so the grid reveals the resolution. And each pedal is checked for where it rests, how far it reaches, and whether it jumps.
Measurement boundary: A browser cannot drive a wheel’s motor, so force feedback is not tested; use the wheel’s own software for that. Switch bounces shorter than one screen refresh are invisible here, and a driver that smooths the signal hides its true resolution, in which case the bench says “at least”.
How to interpret the output
Centre
With the rim pointed straight ahead, the steering axis should read the middle of its range. Half a degree or less is invisible to a driver; more than two degrees and a car pulls on a straight, so recentre the wheel in its software.
Real rotation
The rotation the wheel reports, read from your quarter turn. If it differs from what a game expects, the car turns more or less than the rim; match the two, or let the game set it per car.
Resolution
How many steps the axis has from lock to lock. A 16-bit wheel has 65,535, a step of about 0.014° at 900°, far finer than hands can feel. Pedals with 256 levels are coarse but usable.
Pedal range
Released, a pedal should read 0%; pressed to the floor, 100%. A pedal resting at 3% means a little throttle all the time; one that stops at 94% never gives full throttle. A small deadzone fixes both.
Spikes and combined pedals
A reading that jumps and comes straight back during a slow press is a dirty or worn sensor. Throttle and brake on one shared axis is combined mode, which makes trail braking impossible; turn it off in the wheel’s software.
What a quarter turn reads at each rotation
Turn a wheel 90° and its steering axis moves by 180 ÷ the rotation. The guided check reads this backwards to find the rotation your wheel is set to.
| Rotation, lock to lock | Axis at a quarter turn | One 16-bit step |
|---|---|---|
| 270° | 0.667 | 0.0041° |
| 360° | 0.500 | 0.0055° |
| 540° | 0.333 | 0.0082° |
| 720° | 0.250 | 0.0110° |
| 900° | 0.200 | 0.0137° |
| 1080° | 0.167 | 0.0165° |
| 1440° | 0.125 | 0.0220° |
Troubleshooting unexpected results
The wheel does not appear
Browsers only show a game device to a page after it is used: turn the rim or press a button with this page open. If it still does not appear, check that Windows sees it under “Set up USB game controllers” and try another USB port.
A Logitech wheel is stuck at 270°
Then it is in its compatibility mode, reported as a Driving Force EX. Open Logitech G HUB so it switches the wheel to its native mode, and reconnect.
A Thrustmaster wheel shows as “Thrustmaster FFB Wheel”
That is the generic start-up mode. The Thrustmaster driver switches it to the real model; install it and reconnect.
The brake never reaches 100%
On a load cell brake, 100% needs the force set as maximum in its software. Lower that setting, or press harder; on a potentiometer brake, recalibrate.
Frequently asked questions
How do I test my steering wheel on PC?
Open this page in Chrome, Edge or Firefox, turn the wheel or press a button so the browser shows it, then run the guided check. It needs no download and works for any wheel, pedal set or shifter the computer sees.
Can I test a G29, G920 or G923 online?
Yes. The bench names Logitech wheels from their USB ids, reads every axis and button, and warns when the wheel is stuck in compatibility mode, where it is limited to about 270° of rotation.
Why does my brake pedal not reach 100%?
On a load cell brake, the maximum force in the pedal software is higher than you press. On a potentiometer pedal, it needs recalibrating. The report says which, and the percentage it did reach.
What are combined pedals?
Throttle and brake sharing one axis, one pushing it up and the other down. Pressing both cancels out, so heel-and-toe and trail braking are impossible. Modern games expect separate axes; turn combined mode off in the wheel software.
Can a website test force feedback?
No. A browser can make a controller rumble, but it cannot send force feedback to a wheel’s motor. Use the wheel’s own software for that; this bench tests everything the wheel sends to the computer.
How many degrees should my wheel rotate?
Match the car: most road cars are 900° lock to lock, GT and formula cars far less. Many sims set this per car when the wheel is at its full range. The quarter-turn step shows what your wheel is set to now.
