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bruce

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Everything posted by bruce

  1. The files of some of the riders get posted on www.cyclingpeaks.com not everybody. I have done some marking up of the files to extract the info that I am showing above - otherwise there would be data overload. They are posting Adam Hansen's file everyday, which is really cool because we can start to see just how much fatigue these guys accumulate through the tour. I'll post some summary info on Adam in a short while.
  2. Here are the power stats from the guys that did the leadout for Cavendish's win yesterday: Adam Hansen: Before leadout: Duration: 5:23:26 (5:24:10) Work: 3628 kJ TSS: 213 (intensity factor 0.629) Norm Power: 251 VI: 1.34 Distance: 141.615 mi Min Max Avg Power: 0 1170 187 watts Heart Rate: 0 171 112 bpm Cadence: 29 229 91 rpm Speed: 0 48.2 26.3 mph Leadout: Duration: 10:54 Work: 253 kJ TSS: 22.4 (intensity factor 1.11) Norm Power: 444 VI: 1.15 Distance: 6.217 mi Min Max Avg Power: 0 948 387 watts Heart Rate: 137 194 167 bpm Cadence: 36 135 103 rpm Speed: 27 43 34.2 mph George Hincapie: Before Leadout: Duration: 5:23:38 (5:24:04) Work: 3524 kJ TSS: 204 (intensity factor 0.615) Norm Power: 246 VI: 1.36 Distance: 141.291 mi Min Max Avg Power: 0 948 181 watts Heart Rate: 0 240 13 bpm Cadence: 29 251 87 rpm Speed: 0 48.5 26.2 mph Leadout: Duration: 11:12 Work: 277 kJ TSS: 23.2 (intensity factor 1.114) Norm Power: 445 VI: 1.08 Distance: 6.689 mi Min Max Avg Power: 0 1189 413 watts Heart Rate: 0 191 16 bpm Cadence: 57 123 102 rpm Speed: 16.5 46.9 35.8 mph Markus Berghardt: Before leadout: Duration: 5:14:36 (5:26:05) Work: 3560 kJ TSS: 218.3 (intensity factor 0.645) Norm Power: 258 VI: 1.37 Distance: 129.553 mi Min Max Avg Power: 0 1089 189 watts Heart Rate: 0 236 119 bpm Cadence: 29 159 94 rpm Speed: 0 47.5 24.7 mph LEAD OUT MARK: Duration: 07:46 Work: 201 kJ TSS: 15.9 (intensity factor 1.109) Norm Power: 444 VI: 1.03 Distance: 0 ft Min Max Avg Power: 0 1204 430 watts Heart Rate: 0 184 170 bpm Cadence: 38 121 106 rpm Speed: 0 0 0 mph Some interesting things to note: Overall, this stage was pretty much LSD/Active Recovery for these guys. All 3 guys did 10minutes at higher than 110% FTP - flat out VO2Max levels in the leadout. All three files are almost identical, the team had a plan right from the start of the stage.
  3. So it will work exactly like a SRM' date=' at half te price. Or actually, better than the SRM, because the battery can be replaced at home. [/quote'] This is an important point, currently battery replacement is quite an expensive process with the SRM, and you lose your power meter for a couple of days. Also, you need to send the SRM in for calibration every 18 months or so, which is a trip back to Germany - also quite expensive and you lose your unit for a while.
  4. [DISCLAIMER] I have a very good relationship with Bicycle Power Trading' date=' and support the Powertap units up here in Gauteng - so my opinion is probably a little bit biased [/DISCLAIMER'] Having said that, in terms of value for money, reliability, accuracy, I believe it is the best unit on the market. The debate about whether it is better to have a crank based unit (and then be able to swop wheels) or a wheel based unit (and then be able to swop bikes) can only be settled by the needs of each individual. But in terms of value for money there is nothing that can touch the powertap, and it's accuracy and reliability are as good as anything available. I coach some riders, so having a wireless unit that I can just put on the riders bike in 2 minutes so they can do a proper test is very useful for me.
  5. Yes, the principle is identical. The patent on the SRM expired a little while ago, which has enabled other manufacturers to build an equivalent unit.
  6. Well, if I could just get my hands on one, I'd happily do a comparison!!
  7. He he, very true! The email I got spoke about not being certified for the power in non-U.S. countries. They were probably referring to the necessary RF certifications required by ICASA etc.
  8. They won't ship to anywhere outside the U.S. Being good Americans they are scared that you'll plug a 110v thingie into a 220v hole and fry your fingers, then sue them for $1450 gazzillion
  9. bruce

    Q Rings

    I think you'll need two
  10. I think that capability is already available. The speed vs. power curve for a number of popular indoor trainers can be programmed into the unit, then the unit calculates your power output based on the speed that you are riding.
  11. Paul van Zyl - Maillot Jaune Trading paulvanzyl at telkomsa dot net bruce2008-07-09 05:59:07
  12. Yolandi du Toit rode the Grande Boucle Internationale Feminine (ladies version of TdF) last month. She is currently training in the Alps, and will be riding 2 stage events this month. She rides for Lotto Belisol.
  13. bruce

    Q Rings

    I just hope that they will test tandem with and without them especially on the hills as that is when the full effect of them kicks in. No plans to test on a tandem, powertap hub is not designed to go on a tandem. Not a major problem though, valid conclusions can be drawn from half-bikes.
  14. bruce

    Q Rings

    There is a proper study being done down at Rhodes University over the next few months. Q-Rings will be tested by a number of cyclists and the bikes will be equipped with power meters - results will be very interesting to see.
  15. CP0.08 Preeecisely!
  16. bruce

    garmin 305

    I've not had any problems. How is the bracket breaking?
  17. Any regular spider observer out there will know that it took a lot to type this statement
  18. I have personally seen Gary from Just Fun Cycling (Trek Agents) going out of his way (after office hours) to sort out a loan part for a customer that had a problem. I have seen him replace an older generation frame with a newer generation frame (and a beter spec) due to a warranty claim, no problems!
  19. Finally!!!! A 6 page thread on the hub about bicycles!! 'bout time!
  20. http://www.cyclingnews.com/tech.php?id=tech/2008/features/saris_powertap_launch_08
  21. Precisely. Another interesting study was done in the U.S. by the Olympic Training Centre. They found that the discipline that has the smoothest pedal stroke was mountain biking. Timetrialists are pretty bad' date=' and track riders even worse. Mountain bikers need a smooth pedal stroke because it is required for riding on surfaces that can easily lose traction. Track riders and timetriallists went the other way, because they require power output, bottom line! There is no traction loss on concrete/tar surfaces. As that tyre advert says, "There is no power without control" - or something along those lines. As you say, your body will naturally select the appropriate cadence and pedal stroke that feels the most comfortable. This is derived from the specific fibre composition in your leg muscles. Peak torque and optimum muscle contraction speed is very much a function of your own particular muscle makeup.[/quote'] Exactly!! <?: prefix = o ns = "urn:schemas-microsoft-com:office:office" /> Your natural instincts take over after a few minutes and even more so when you become fatigued. This is highlighted in endurance sports which require technique, swimming is a good example. Adjusting your bike set up can influence what your feet do while pedaling, but to actively try and force your foot to toe down / flat or up is a waste of time. Armstrong's technique became the gospel on how to ride a bike. The ironic thing is that if Armstrong had stuck to triathlon, Jan Ullrich would have been the greatest cyclist of all time, and guess what pedalling advice the guru's would be dishing out on Internet forums if that had been the case?
  22. Precisely. Another interesting study was done in the U.S. by the Olympic Training Centre. They found that the discipline that has the smoothest pedal stroke was mountain biking. Timetrialists are pretty bad, and track riders even worse. Mountain bikers need a smooth pedal stroke because it is required for riding on surfaces that can easily lose traction. Track riders and timetriallists went the other way, because they require power output, bottom line! There is no traction loss on concrete/tar surfaces. As that tyre advert says, "There is no power without control" - or something along those lines. As you say, your body will naturally select the appropriate cadence and pedal stroke that feels the most comfortable. This is derived from the specific fibre composition in your leg muscles. Peak torque and optimum muscle contraction speed is very much a function of your own particular muscle makeup.
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