Trouble with Windscale

[angleman]

I'm trying to get profiles set up for two bikes. Both bikes have stem mounts and I am seated in similar positions on both. On bike 1 I've been able to execute a cal ride and I am now using a windscale of .604. It's not perfect yet, but I feel like I am getting closer. On my other bike, however, I cannot get a good cal ride. I have tried many times and each time I get "bad cal." The most recent two attempts generated windscale factors of .435, which seem strangely low relative to my other, similar bike set up. I'm told I got the bad cal message because the windscale was below .5 and that the new SW and FW will not lead to this error.

anyway, attached are cal ride files from each bike. if anyone has any suggestions about getting the second bike set up properly, i'd love to hear them.

great thanks!

[racerfern]

If you consistently get wind scaling below .5 then go with it. Even though you're getting a BAD CAL message after the cal ride, the data is stored in the cal ride file so you can still create a profile.

BTW, my wind scaling is .462 so if I do a calride I get the same error message.

[Velocomp]

It is not an actual calibration problem if the wind scaling factor is below 0.4. Indeed, the iBike should NOT report "BAD CAL" under those circumstances. This "BAD CAL" bug has been corrected in FW 415. FW 415 is accessed from the new iBike 4 software, available here:

http://www.ibikeforum.com/viewforum.php?f=35

[coachboyd]

The low wind scaling can happen if your iBike is kind of far back on your stem, or if you have a certain shaped front to your stem. The wind can hit the faceplate of the stem right next to the windport of the iBike and cause a low wind scaling. Of course, once you have calculated for this you're fine to leave the iBike where it is, but this one took even us by surprise a little at how much it lowered the wind scaling and we had to adjust the limits.

But like Fernando said, even his wind scaling is that low and he gets very consistent results.

[angleman]

Thanks very much, fellas!

I updated my system with the new SW and FW. Today I got through a cal ride and DID NOT get the Bad Cal error. I then downloaded the cal ride to develop a new profile through the directions outlined in the software manual (Profiles -> Download Coastdowns). I highlighted the portion of the ride to use, but the "Accept Profile & Send to iBike" button is grayed out and unavailable. If I hover my cursor over it, it says "Aero out of range, Fric out of range, Crr out of range." Note the windscale on this screen shows .433 with a riding tilt of -.3. (See attached screen shot)

I then downloaded the ride file from the short ride home I did after the cal ride. I used the menus to extract a profile from this file and it shows the same parameters as the profile I had set up manually before the ride. Windscale = .435, Aero = .168 and CdA = .385.

Shouldn't the ibike set itself to the new parameters after a cal ride? Mine seems to have kept using the old numbers.

Any thoughts would be great.

-justin

[Morocco Mole]

I've never quite understood the "highlight the portion that is out-and-back" feature. Isn't the point of the Cal Ride that it is all an "out-and -back" ride?

[racerfern]

Before switching to the Bring your own DFPM data tab, stay on the coastdowns tab and click the Crr box just below the button that says "Remove Selected". That will give you options that will allow creation of a profile. Then switch to the DFPM tab.

[travispape]

Thanks very much, fellas!

I updated my system with the new SW and FW. Today I got through a cal ride and DID NOT get the Bad Cal error. I then downloaded the cal ride to develop a new profile through the directions outlined in the software manual (Profiles -> Download Coastdowns). I highlighted the portion of the ride to use, but the "Accept Profile & Send to iBike" button is grayed out and unavailable.

From the screenshot, it looks like there were no coast-downs in the unit to be downloaded. If there were coast-downs, the Coast-Downs tab would have been available. Perhaps you had erased the ride memory since you did the coast-downs.

Everything should work fine if you get some coast-down data together with your cal ride.

Travis

[travispape]

I've never quite understood the "highlight the portion that is out-and-back" feature. Isn't the point of the Cal Ride that it is all an "out-and -back" ride?

That is mostly for those who have Gen I and II units, which don't have the separate cal ride--the cal ride shows up as a regular ride file and does not automatically close at the end of the ride. If one does an out & back and then rides an additional couple of miles to get back home with a Gen I or II unit, you would need to highlight just the out & back portion of the ride to create the profile.

Travis