Wrong speed shown on display

[veloman]

I recently got a new speed sensor due to water getting into the old one. On two occasions since installing the new sensor, I've gone on rides where the max & average speed was insanely high on the head unit display. For example today I averaged 56.2 mph with a max 60.5 mph and covered 126 miles in 2:14 . . . soooo wish these numbers were true. During the ride I didn't notice any unusually high speed numbers on the display, but then again I wasn't exactly watching it all the time. Yet when I download the data the correct numbers show up in iBikeMac (18 mph ave, 48.4 mph, 40.32 miles, 2:14 . . . don't laugh). I'm running firmware 4.20 on my iAero Gen III and using iBikeMac 4.0.4.

Any ideas?

Thanks for your time.

-craig

[nigeld]

Make sure it's not picking up the cadence magnet.

[veloman]

I've mounted the speed sensor the exact way I had it before when I had no such issues. Also, if it was picking up the cadence magnet, it would be reading high velocities all the time. To get an average of 56.2 it would have to constantly be reading in the 50's, but the displayed speed was correct. Just the ave and max that were screwy. Hence my confusion.

-craig

[Velocomp]

Please post a ride file.

[veloman]

Here ya go John. Thanks for your time.

-craig

[coachboyd]

Every once in a while I have noticed where something will happen on the display to where you have a blip of very fast speed. For example, I'll be 20 miles into a ride and look down to see a max speed of 75 and my distance being 85 miles. I think what may be happening is somewhere in there a section of very fast speed gets written into the averaging section on the iBike display but doesn't actually get recorded into the ride file. My files have been like yours, the information on the display was different than the download. This has only happened a few times over the course of me riding an iBike. I am purely speculating, but it might be caused by some sort of outside interference like a TV tower or high tension lines.

[Velocomp]

There is a speed spike in your ride file at mile 3.6 that is clearly incorrect. This is probably where your iBike got into internal trouble with its counting.

We will check in to this.

[racerfern]

You can try moving the magnet very slightly in any direction. It's possible with just the right spot to get two hits from a magnet as both sides of the field pass the sensor. Slide it up or down the spoke slightly or move the sensor ever so slightly further from the magnet. It's a solution that has worked for others.