all of my coast-downs are failing

[DaveP]

Hi...

I'm a new user, actually haven't been able to get my first ride in yet, since all of my coast-downs are failing.

Here's a typical coast-down scenario...

From the COASt screen, I start pedaling slowly, hit the center button, and it says FAST, so I start to accelerate, but after about 3 pedal strokes, it tells me I've reached over 25mph, and it tells me to coast, which I do. On the coast-down, the speed drops, then increases to 50,60 or 70mph, then drops back down to the teens, then again to 50+. Soon after, I get "coast failed", and I start over, but I always get the same result.

I am sure I have the right wheel size, 2100, and both the SPEED and CADENCE sensors are paired, my weight is accurate; the wind offset is 0, and the tilt is calibrated properly.

As I start pedaling, the watts reading is over 600, and I am not that strong. I also have 4 brand new batteries that I installed today - and they're fresh - just ordered from iBike.

Any suggestions? This is the 3rd consecutive weekend of trying to get successful coast-downs, and it's really frustrating.

Thank you

Dave

[Velocomp]

Please do the following:

1) Go to the Fast Start screens and complete them again (this counteracts the effects of any bad coast downs)

2) Do a short ride, say three miles. Don't worry about coast downs

3) Please download your ride and email it to me at jhamann@velocomp.com

Something very odd is going on with your speed; that is the cause of your bad coast downs. Once I have a ride file from you it will be easy to figure out what is going on.

[bex]

I had a speed problem just a couple of weeks ago.
I had changed wheels, when I replaced the sensor magnet I think it was too close to the sensor and was picking up a double signal (perhaps)
My speed was all over the place but I could not figure it out until I got home and was able to hear the double "tic" sound of the magnet passing over the sensor.
I moved the sensor further away and the issue resolved.
Hope your issue is that simple

Bex

[Velocomp]

He sent me his ride file and there is, indeed, craziness in his speed data.

I've provided the same advice about speed sensor placement. We'll see if that fixes things!