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Subject: PowerTap 2.0 vs. 2.4 wireless

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Posted:11/9/2008 11:39:13 AM

A question for you PowerTap users out there -

I have been using a wired PowerTap SL for the better part of 2-2.5 years. I have tons of data to show consistency in rides, event comparisons year-over-year, etc. I have even had the hub sent back to Cyclops for servicing. I have used the same hub in both a 404 and 303 set-up.
I just started using a Zipp Sub-9 PowerTap disc for the time trials. While I have only had limited time and file output from this disc, I have not noticed any major discrepancies between the two.
Both "zero out" in a coasting mode so I don't believe there are any torque issues to address in either.

However, after the two recent events at Santiago Canyon, I have wattage levels on each of the climbs that are atleast 30% below what I know I am capable of putting out. While I didn't feel particularly "snappy" in yesterdays race, this seems a bit too much.

Does anyone have data they would be willing to share/discuss regarding wattage discrepancies between the wired SL hub and the new disc? I do plan on doing some additional testing of the disc on Newport Coast to test wattage levels, which is where I conduct most of my hill interval work.

Thanks guys.

Jeff
949-375-3380

jstevenson
Posts:17

Posted:11/11/2008 1:51:08 PM
Jeff, I don't have PT's but you could test them out on a bike that has an SRM or Quarq crank power meter and see how they compare.

dgonyer1
Posts:1

Posted:11/12/2008 11:33:06 AM
30% is a pretty significant drop in power (e.g., FT=300, -30% = 210, did you mean 30 watts as opposed to 30%? How did your HR, speed, torque, and overall time compare to other Santiago TT results? I just purchased a Zipp 900 PT wireless and have not tried it yet. I plan to do some testing on it based on your post.

gtingley
Posts:78

Posted:11/12/2008 9:44:35 PM
Jeff, how is the data, did you get drop outs with the new wireless unit?

jishmael
Posts:6

Posted:11/13/2008 1:08:41 PM
Dave.... It looks like it might be more on my personal performance than the PT units. I did some testing earlier in the year on the first 4 miles of the Santiago course, basically to the climb. When I go back and look at that I'm about 10% off, which could easily be an "off" day. I'll keep posting on the hardware, but the wattage numbers appear to be consistent between the two.... Jeff

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