Gen II Rocks!

[Ferg]

I have had my Gen II for about two weeks now. I race quite a bit and was having significant problems when I put my Zipp 303 wheels on my Specialized SL2. The tubular tires at 140psi really were hard on the old iBike. But, since I switched to the Gen II it has worked flawlessly. What a great upgrade.

I also had problems going downhill with any set of wheels that I was using. Not anymore. The new unit is spot on all of the time. I highly recommend the upgrade.

Thanks to Richard and John for all of their support. I am a very satisfied customer.

Ferg

[rruff]

Maiden voyage today... lots of chipseal and high speed descents... zero erroneous data.

[jim_s]

I have to throw my hat into this ring - I've had my new Gen II unit out for several rides now, one on a particularly harsh section of road which is my favorite TT route, but which I've previously been unable to do any power-based training on because it drove my old iBike Pro unit bonkers almost the whole way. I'm happy to report that I had a great session on that road yesterday and I have the real numbers that show it! Very sensible numbers the entire way, and only one skinny grey bar in the Tilt-vs-Slope window (and that was while going down a very bad road at 37mph, long before I got to the training route)

I'm still trying to work out some body positioning things (I ride on aerobars when hammering on the flats and rollers - putting more weight on the front of the bike, but climb on the hoods - putting less weight on the front, and the iBike is sensitive enough that its detecting a difference in slope between the two positions. But I have to calibrate for one or the other. This seems to be skewing on-the-bike readings a little, but by a max of 8-10%, only on certain sections (flatter or transition sections, it appears), but that is not vibration-related and the riding position thing is a known and understood limitation of the iBike. (But if anyone has any suggestions for reaching a happy compromise on this situation, I'd love to hear it!! I'd also like to get an idea of how much effect this theoretically would have on the pre/post-analysis values)

At any rate, I'm thinking that its true - Gen II does actually seem to Rock! Thus far, it seems to have been a good investment.

[travispape]

I ride on aerobars when hammering on the flats and rollers - putting more weight on the front of the bike, but climb on the hoods - putting less weight on the front, and the iBike is sensitive enough that its detecting a difference in slope between the two positions. But I have to calibrate for one or the other. This seems to be skewing on-the-bike readings a little, but by a max of 8-10%

You will definitly need different profiles for aerobars vs. riding on the hoods, both for the change in aerodynamics and the change in riding tilt. Load the appropriate profile for rides where you stay with one position or the other.

If you do rides where you change position throughout the ride, you can use the 2nd CdA feature in iBike2. You should get a lower CdA for your aerobar position (if not, let's look into that first). On a ride where you will be changing position, load your profile for the aerobar position. During the ride, make a note of what speed you normally make the transition between positions to plug that into iBike2 later.

Your on-the-road power numbers will suffer a little inaccuracy when you are on the hoods because of the change in aero friction and because of the riding tilt issue; however, both of those will be corrected in the post-processing using the 2nd CdA feature and the "analyze tilt and power..." button. I would not expect you to find a big error--the 8-10% you quote sounds about right.

Travis