Has anyone heard when the Quard S975 for SRAM Red powerglide will be released?

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"Sacred to the god Aesculapius"

This thread is turning wierd. If I buy an SRM-system (or any other PM for that matter) I would be pissed if it wasn't both accurate and consistent. After all, if I spend all that dough on a PM, I am serious about my cycling. If I'm serious, I would like to know how my numbers compare to others, right!? Hence, accuracy is important for such an expensive device. And obviously, if I would get different readings for the same input, how could I ever compare those readings to anything?

I consider myself being serious about training, but i'm more interested in my numbers compared to my last year's numbers, don't care about other's numbers. There's always someone who's faster, so what the heck... So, while accuracy is important, consistency is crucial.

Totally agree.

Me too!!!
So long as it is consistant and l am improving l'm happy.
I can climb local hills in a certain gear at a certain cadence and see that the reading is the same as it was 2 years ago + or - a few watts.

If they create a PM with good repeatability all it takes to also make it accurate is a calibration in a test bench. The calibration can be done semi automatcally in the PM's software just by activating the calibrtion program while the PM is in the test bench. So it doesn't have to add any hardware costs to the PM. But of course you have to add a know reference load to the PM in the test bench to do the calibration, but they are probably going to test if it works anyway before packing it, so a calibration for accurancy wont add much cost.

Repeatability on the other hand is not something you can just calibrate the PM to obtain. To acheive good repeatability you have to make a good design with noise immunity and add compensation for things like temperature, ageing and maybe battery voltage. This all makes the device more expensive. Varitation over temperature is much bigger for electroninc sensing than most are aware of. So if no temperature compensation is added, measurements can vary quite a lot over temperature. And a bike can be expsosed to both very cold temperatures and very hot temperatures in direct sunlight.

You can save money by making a PM with poor repeatability that only shows the correct reading at at calibration temperature and while new. But you don't save that much by leaving out a calibration for accurancy.

It can be made possible for an end user to recalibrate the PM for accuracy himself by applying a reference load and pressing a button.


Weather proofing electronics with connectors, external sensors or replaceable batteries, to work in a bike eniroment is another thing that can be add a lot of cost.

If you have to replace your PM at some point do you want the replacement to produce different power numbers than your old PM?
If you decide to buy a second PM for another bike/wheel do you care if it produces different numbers than your first PM?
If you hire a coach who wants to compare your power numbers to other clients will he want your PM to produce numbers consistent with theirs?

I'd venture to guess that for most people accuracy is crucial.

If you replace your PM with a PM of the same make, most likely any differences will be smaller than the differences in your sustainable power day to day, so hardly even noticeable. If you replace the PM with a PM of a different make, it is easy to account for any differences in output, e.g. PT against SRM...
I have indeed two PM's i train and race with (Powertaps). I keep any eye on their calibration routinely, so the above applies here as well. Differences between the two PT's are not noticeable, and (if they exist at all) definitely much smaller than the variance in my power day to day.
Why would a coach want to compare my numbers to anybody else's numbers? Makes no sense.
OTOH: When my PT tells me, that my FTP has improved by 50 watts during the last 12 months, i want that information to be absolutely reliable. For effective and successful training with a PM, it is really not necessary for the PM to be accurate down to a watt or two, but to be consistent, believe me.

Well there is another system that is more then 10 years old ,and it works independed right and left side,
the question was and is or people who got to work with it understand its potential

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skype Ceesbeers191053
www.ada.prorider.org

>> If you replace the PM with a PM of a different make,
>> it is easy to account for any differences in output,
>> e.g. PT against SRM...

What is your method for approaching this issue? I have a couple srm vs PT files and simple correction factors don't do it. There is also a potential issue of drift over time and user calibration.

I am very interested in this topic as I'm looking at running SRM on road and Quarq on TT next year. The SRM vs PT experiment was something I did on a whim as I had a wireless PT available and threw it on my SRM equiped bike to see what the differences were.

Brim Brothers have made a new blog entry today. But there's not much news to tell, except that they will have some interesting news to tell in a month or two:
http://www.brimbrothers.com/2010/03/the-business-end

New blog update from Brim Brothers today: http://www.brimbrothers.com/2010/07/working-hard

Does this mean they'll be returning their Interbike award for best new product, or whatever it was?

Love the picture they posted of the riders hitching a pull up the Tourmelet. Is that Schleck I see at the back?

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2011 Cannondale SuperSix HiMod: 6.19 kg. / 13.65 lbs.
2005 Fuji Team Issue: 6.6 kg. / 14.5 lbs.

What award are you talking about. AFAIK Brim Brothers have never displayed any product or pictures anywhere and therefore have never received any awards either.
Are you sure you are not thinking of another powermeter manufacturer? Maybe MetriGear? http://www.metrigear.com/products/
MetriGear was displayed at Interbike 2009, but I haven't heard about any awards they have won though: http://www.bikeradar.com/mtb/news/healt ... gear-23513
But there wasn't anything on display from BrimBrothers.

MetriGear was in Cyclingnews 2009 reader poll - Best new product, but didn't win: http://www.cyclingnews.com/editions/mtb ... ary-5-2010

You're right -- it was metrigear. I was sort of being tongue in cheek ... didn't mean to send you on a mission!

A couple weeks ago I was reading an old issue of Bicycling or some similar rag's coverage of Interbike, which featured a photo of the metrigear guys holding an award for most innovative product or something, and I thought, gee, with the advantage of hindsight I guess that was a bit premature wasn't it? Anyway, I'll look for the mag and see if I can close the loop on this later this evening.

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2011 Cannondale SuperSix HiMod: 6.19 kg. / 13.65 lbs.
2005 Fuji Team Issue: 6.6 kg. / 14.5 lbs.