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  1. Aztec

    SRM Chain Slip/Jam

    I checked, and the width is 5.9 vs. 6.2mm. Hard to imagine that .3mm would allow it to get caught in there, but you never know. Pity I don't have the Campy tool and had to finesse that sucker on there! Hate to waste a $65 (LBS) chain. :-(
  2. Aztec

    SRM Chain Slip/Jam

    I'm using the 'stock' FSA rings that came on the SRM. I assumed they would be identical to Campy rings given that it's square taper and supposedly for Campy! I run Wipperman 10s on my other bike, so I'll try swapping that chain over.
  3. Aztec

    SRM Chain Slip/Jam

    Odd thing today. When I shifted down to the small ring, the chain (new Campy ultra-narrow) somehow managed to sit between the two rings and just slip while I pedaled! Now, this isn't supposed to be a clutch, so I'm not thrilled about it. Yes, my FD is adjusted properly. Is this a known problem...
  4. Aztec

    PT SL carbon rim - power drops

    8-10 drops for one second each? That's nothing to worry about, and about what I get (maybe 2-3 per hour) with mine. Usually has to do w/ power lines or something. It's when those drops were more frequent and lengthy that I complained (just got a PTSL back from Saris, and had my PT Pro repaired...
  5. Aztec

    SRM Zero Offset Drift

    Update... That change to slope put it about 6w higher than my Powertap, both on average and for peak 2 mins-60 mins. Very glad to see that. Now I'll fudge the slope up a bit to match the PT for consistency sake. Although, with me getting away from the PT, I won't be able to easily check vs. the...
  6. Aztec

    SRM Zero Offset Drift

    I feel so vindicated. :-) Thanks for all the help.
  7. Aztec

    SRM Zero Offset Drift

    OK, performed the test. Interesting. See what you think. I had a lot of upward zero offset drift during the test. I pulled the pedals and sandwiched a bolt through the hole to hold weights. The results listed below are out of order, as I switched back and forth across sides, but the general...
  8. Aztec

    SRM Zero Offset Drift

    You've given me a great idea. I have old MTB pedals that will fit through a 25lb plate. To use two plates, I'll have to load them onto an inverted-T pin and hook that onto the pedal. I'll try 25 and 50 lbs, and use your method of finding the highest frequency. Thanks for all the help with this.
  9. Aztec

    SRM Zero Offset Drift

    Thanks for the ideas. The UPS store weighed my old weights. SRM sent me their calibration spreadsheet and instructions. Interestingly, they only suggest you measure with the crank at 3 o'clock/level. No looking for the max frequency as the crank rotates upward. I'm anxious to get at this...
  10. Aztec

    SRM Zero Offset Drift

    Ah, I see now. Hmm. How do you actually hang the weights if you are using a Computrainer? Either those weights are very small or the CT is up on blocks. And I assume SRM's use of a "pedal blank" is superfluous and that I can just hook something over my pedals. I don't see why the SRM document...
  11. Aztec

    SRM Zero Offset Drift

    I read through the SRM calibration method posted above. Seems simple enough so long as I can find a way to keep the bike stable in the air and find a scale that accurate. How did you test across a range of power levels?
  12. Aztec

    SRM Zero Offset Drift

    Thanks for the detailed thoughts. Very useful. Now, if you had 2+ years of data in CP, would you still want to calibrate the *new* powermeter precisely, or would you simply want continuity with the old powermeter?
  13. Aztec

    SRM Zero Offset Drift

    :-) You do realize, though, that those weights are extremely inaccurate. You'd have to weigh them on a reliable scale first.
  14. Aztec

    SRM Zero Offset Drift

    New issue... and follow up. First, the offset drift has settled way down in just 50 total miles. But now I have a different concern. While the power measure between the SRM and the PT is very similar at low wattages (e.g., 130-170w), it begins to get pretty wide by 200-240w. The SRM...
  15. Aztec

    SRM Zero Offset Drift

    I figured those wouldn't be causes. I just hope this stabilizes so I can get confident enough to yank the PT stuff off there! I couldn't seem to get the Power V to go into offset mode while actually riding. I'm assuming I just haven't figured it out? That must be the case, as I can't imagine...
  16. Aztec

    SRM Zero Offset Drift

    Thanks for the info. Thankfully, I'm not at all worried about a single day's data (I rode w/ my PT Pro still hooked up). And I am DELIGHTED to see that you ride an SRM. FWIW, after resetting the SRM once seeing preposterous watts, it was literally within 1w average for the next ~30 mins. It was...
  17. Aztec

    SRM Zero Offset Drift

    I'm new to the SRM (Pro). In my first ride, I saw my watts creep up to an unrealistic level. Yes, it got warmer on the ride because I first reset it in my 65F garage, and then rode in the sun (maybe 70F). The zero offset value rose approx 200. Toward the end of the hour ride, my watts were...
  18. Aztec

    Announcing Version 2.1 WKO+ with Performance Manager!

    Can you tell me what the little X is at the left end of every row in the Calendar? I love seeing IF/TSS on there, by the way.
  19. Aztec

    Single pivot brakes -- how to set them up?

    I just bought a set of single pivot XLab brakes (wanted dual pivot, but they were sold out). Now I find myself with a problem... having never used them before, I can't seem to figure out how to set them up properly. They seem to be sensitive to the length of the cable casing... too long and it...
  20. Aztec

    What rims?

    The addition of the PT makes no diff. Use the same rims you otherwise would, whether it's for training or racing or both. I used a DT R1.1 rim.