Upgrade to enjoy this feature!
Vital MX fantasy is free to play, but Premium users receive great benefits. Premium benefits include:
- View and download rider stats
- Pick trends
- Create a private league
- And more!
Only $10 for all 2026 SX, MX, and SMX series.
A stark varg.
Use your phone. There's an app for that. (Many, actually.)
An IMU?
I only see a couple for acceleration in the Apple App Store, do you know of any specific ones? Where would the phone be mounted without damaging it? I’d think vibration would degrade it without proper isolation?
The Shop
Luxon 4-Post Bar Mounts
$189.95 - $239.95
DeCal Works Huge Plastic Inventory of UFO and Polisport kits.
For GPS-based g’s I use a VBOX. For DAQ you can get IMUs rather cheap but mounted to the bike you get a very noisy signal from vibrations that you have to filter out afterwards.
GoPros record data from the accelerometers along with the video. You can access it using free online services. I just used it to measure cornering G’s in a car and it was pretty good.
What situation are you measuring?
I did a quick Google search and saw a bunch. I don't have a particular recommendation, though.
Looking to measure g-out locations on various mx tracks; jumps, corner apex, rollers, etc.
Cool. GPS is very simple to collect but has limitations. You will collect gps-derived accelerations of the receiver in world coordinates, this may not represent what the bike or overall cg is experiencing. Onboard DAQ you can have an IMU near the cg and measurements will be vehicle coordinates. I guess depends if you are looking for hobby or research grade. There is a new VBOX out now for $900 that collects GPS, video, and has analog/ CAN inputs.
Accelerometer..we compared $50K laboratory units to several free apps available at the store. No noticeable difference...none. We still purchased the expensive unit.
jlang13 has tested these devices and can tell you best! Reach out to him, he has recently purchased all 3 of those device, hopefully he chimes in here as well.
If you're using a GoPro, you need to make sure the model you're using has both GPS & accelerometer/gyro telemetry. Some cameras have both, some have one & not the other, & some have neither.
The SkyPro XGPS160 (LitPro) receivers are pretty good and the LitPro software is very easy to use, but I believe the software is calculating g-forces rather then measuring it with an onboard accelerometer/gyro. I personally use this setup & it's easy to toggle data view to g-forces, but if I am remembering correctly g-forces are mostly only shown in corners & accel/decel zones and not on jumps.
If you went the RaceLogic route, you could use the VBOX Sport, but the lat/long accelerations are calculated in the post-processing software rather than an actual force measurement. You could use the IMU04 inertial sensor, but then you have to figure out how to tie it into a DAQ device w/ GPS. Gets somewhat complicated in a hurry.
From a plug-and-play perspective, the AiM Solo 2 DL would be the easiest route to go. It has onboard data logging and the 3-axis accelerometer, gyro, & magnetometer all tie directly to the GPS signal. The data works with their Race Studio software which is pretty user friendly, yet also very sophisticated.
It wouldn’t be too hard, they’re all pretty simple devices to wire and mount. Just write some can messages to the logger and feed it 12v and 0v.
This IMU works very well too:
https://www.izzeracing.com/products/6-DOF-CAN-Inertial-Measurement-Unit…
Post a reply to: Device for measuring G-forces?