My iAero is on order!
The upgrade price of $250 ($220 with coupon, read ibikeforums announcements) is too good to miss. Although because I only have the original wired speed sensor I also opted to upgrade to the wireless mount as well for another $250. But still very acceptable upgrade path from the iBike Pro.
Stay tuned...
The reference manual for the iAero has been put online here.
The iAero is a new version of the iBike Pro that addresses some of the problems with the original hardware design (most of which have been overcome with latest firmware revisions and the new ibike 2 software.) But the new model promises even better accuracy and damping control in rough pavement.
Anyone interested should read the manual. It looks like this is exactly what everyone on the ibike mailing list (now ibikeforums.com) have been asking for.
I'll describe three different new features that have me excited.
First is SnapShot CdA(TM). As long as you have an iAero and cadence/speed sensors the iAero can easily tell when you are producing zero watts (cadence is zero and the bike is still moving.) At that point it can determine what the differences between your current CdA and your baseline CdA (as computed in coast downs, 4 mile ride, saved in profile etc.) and can then display that number. Just find a long hill (2-3% works well, you don't really want to get going too fast) that you can get up to appropriate speed on and then coast for > 10 seconds. Now you can adopt various positions and see what the difference in CdA is just by doing repeated tests.
While not quite as good as wind tunnel testing (we presume) it's a lot less expensive and more convienent. Note that you don't really need a hill. A long straight road that you can get up to speed on and coast for 10 seconds will also work.
Second is Time Advantage(TM). Assuming you already have a power meter (e.g. Ergomo, PowerTap, SRM, Polar) and can use it for the same rides, then you can use the ibike 2 software to incorporate that power data into the iAero ride file for comparison. Differences between the two are assumed to be due to CdA changes. This can then be used to show how much time you have either lost or gained over a ride compared to what you should have done if you stayed in the same position as your coast down rides.
Coupled with SnapShot CdA, you can now determine what changes you would like to try on a long TT (farther forward, more relaxed, etc) and see overall the impact in your finish time when you analyze the data.
Finally we have Continous CdA(TM). This requires that you have an Ant+Sport(TM) enabled power meter. E.g. Quarq Cinqo or (soon?) SRM Wireless. This is paired with the iAero and when this data is available the iAero can show CdA in real-time. Make a position change and see the change in CdA.
Also see the cumulative effect with the realtime TimeAdvantage readout. Based on your predicted time based on your baseline CdA, how far or behind are you. In real-time. As you are doing your TT!!
So. First during training, learn how to get CdA low. Change equipment, move things around, do lots of testing. Find the sweet spot for hardware and position. Then, during the race, keep yourself in that sweet spot. Even when you start to get tired (for me that's 5 minutes into the TT) it will tell you when you are moving out of it.
Possibly not as good as having your coach following you in a car 100 feet away, yelling "Allez, allez" continously over your team radio. But again a (lot!) less money and most organizers don't allow coaches in cars on their course anyway. At least at my level :-)
Now if only I could get them to sell me one NOW. I want it NOW. I have important TT's in two weeks. Can't they UNDERSTAND I NEED IT NOW...
The numbers crunched, but not too well.
Two problems I think. First I need to get the iBike moved from above the aero-bars to below (using for example the Topeak Bar xtender.)
Second, I think that the cold caused the battery level to go too low.
So, at this point inconclusive results.
Out to Neaves Road to try out the new iBike2 firmware.... I will (hopefully) provide some CRR and CdA numbers.
Ran three sets of tests on my P2C:
1. non-aero with Bontrager Aeoleus wheels
2. aero with Bontrager Aeoleus wheels
3. aero with Bontrager X-Lite Aero
At the end of the day I also did an iBike torture test, the section of Neeves Road just to the north of my normal TT and wheel test area has some of the worst chipseal and cracked pavement...
I'll run the analysis later and post results..
Yesterday was heavy rain, so spent an hour and a half on the Computrainer, doing the Athens Triathalon course... 5 8km loops with one medium and steep climb (.5km at 7-8%, 300m at 15%) and another shorter climb. Mostly done as L2/L3.
There is a new version of the iBike software (aka ibike2) available.
ibikepro download
Both firmware and new application (Mac and Windows). Along with new procedures for coast down, and doing a "Four Mile" ride, the new iBike2 software will do post-analysis on your coast down(s) and ride to get a much better set of numbers (CdA and CRR) to allow the iBike to report more accurate numbers.
The post-analysis software can also eliminate many of the old problems (tilt problems, wind changes, vibration problems) by filtering the ride files.
I'll be trying this out soon. And I put together a quick checklist of the procedures for getting the initial profiles (tilt, wind, coast down, 4-mile ride) etc, done correctly.
iBike Checklist...
The new iBike2 software produces CdA and CRR numbers as part of the new process of creating a "profile". This involves multiple coast downs, then doing a 4-mile ride under reasonably controlled conditions, then doing post-analysis.
Hopefully the produced numbers are reproducible and can be used as the "poor mans wind-tunnel" to evaluate aero-gear, wheel sets, bike position etc.
