# Can't afford SRM or PT right now, other power measurement tools?

Discussion in 'Power Training' started by Rideastrong, Sep 7, 2005.

1. ### RapDaddyo Active Member

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Good plan. Actually, I hope somebody chimes in with comments (good or bad) on my quick and dirty protocol for training with power on a trainer with only a speedo. As to the PM Clinic, I know there is one in Clermont, FL December 3-4, but I don't know about CO Springs. Given that CO Springs is USA Cycling's home base, it is only logical that they will have a power clinic there, but maybe not until '06. BTW, I think you may need to have your Expert or Elite Coaching License to attend.

2. ### Eldrack New Member

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I can't afford a power meter either so i go with a nice approximate approach using a Tacx swing trainer. Each resistance level on the trainer (magnet) is related to a certain force (nice little graph in the instruction book to work this out). Multiply the force of the magnet by the speed (convert to meters per second) on your cycle computer and you have power output. I got the trainer for 115 UK pounds.

How accurate this is I don't know and you have to know a tiny bit about physics to work out what power your producing but its worked for me so far.

3. ### RapDaddyo Active Member

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That's interesting to know about the power conversion chart in the instruction book. Frankly, I have never looked at the book. I'll have to see if I can find it. I'd like to compare the computed power numbers with my actual power numbers at different speeds. But, let me clarify something about my training protocol above. My protocol doesn't require that one computes power or converts speed to watts. All you do is determine your maximum sustainable speed at a given duration (e.g., 20 mins) and use that as the basis for an interval session at that duration (specifically .92xMS). This also gives one a way to track progress because one's maximum sustainable speed at that duration will increase with fitness. The power equivalent is a "nice to know" but not essential to effective training.

4. ### F1_Fan New Member

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CycleOps produces a nice graph for the Fluid2 trainer showing the relationship between power/cadence/gear. I haven't checked it against my PT SL yet but the graph numbers match what I "feel" on a local test hill I ride (average power calculated at kreuzotter.de).

It's unlikely to be perfect but I think it's a good estimate for someone without a power meter.

5. ### Rideastrong New Member

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that is ok. I just ordered my club coach materials from Sam down in C-springs. If i need to get my expert to attend i will make plans to attend those clinics prior. I have alot to learn and am eager to do so. So this should be no problem.

6. ### RapDaddyo Active Member

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If you move quickly, you can do the Expert Clinic in CO Springs in October and then attend the Power Clinic in FL in December. I'll be at both.

7. ### biker-linz New Member

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I happened to be passing and thought this might help you out:

http://www.geocities.com/almost_fast/trainerpower/

Apologies if it's been posted already.

L.

8. ### RapDaddyo Active Member

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I had not seen that link. Thanks, Lindsay. I wonder if there is consistency from unit to unit within the same model line?

9. ### cbjesseeNH New Member

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Picked up a Powertap Pro hub built into a DT Swiss RR 1.1 32 2-cross DB-spokes wheel and a similar front wheel built with a Simano Ultegra hub, shipped 2nd Day Air from AirBomb.com for \$965.66. Used coupon code TPM77 for 10% off. The full CPU, harness, software kit arrived with the wheels 5 business days after I placed the order.

I had doubts about Airbomb based on others' comments, but they tracked fine online and delivered as ordered.

CPU SN 504XX, does that seem to be recent production?

Do hubs have a SN anywhere?

Now to put on tires and install!

10. ### Rideastrong New Member

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i won't have time to complete it to get to FL for the December clinic. I am thinking that maybe over the winter completing the expert clinic and attending the power and nutrition clinics in 2006.

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13. ### Rideastrong New Member

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Thanks for the link. But i need to wait till next season to buy one. I have a few other things i need to take care of first. We decided to put in hardwood floors and the wife wants a new Audi. So my powertap will have to wait till 2006 sometime. But this gives me time to learn more and figure out how i am going to use it before i buy it.

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