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Changing the Battery in a SRM PCV Powercontrol

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Words and Images by Kraig Willett

In 2002 I bought a used SRM Pro powermeter.  I’ve had the crank battery replaced once in the past 9 years (less than 20,000 km).  Since day one, the powercontrol (the head unit) battery has been a bit problematic.  First of all, the display that supposedly shows how much battery life was remaining was unreliable.   For example, the PCV display might have said that I had 25 of 29 hours left on the charge, but inevitably, it would run out after only a few hours.  Secondly, and probably related to what is mentioned above, is that the battery just wouldn’t hold a charge for very long.

Last Updated on Monday, 01 August 2011 02:01

Cycling Power Meter Review

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2011 Cycling Power Meter Review

words and images by: Kraig Willett

<editor's note: this cycling power meter review is long and detailed - skip to the end for the big picture results, or download the pdf version and read at your leisure -> enjoy!  -k>

1992 was the year I started racing my bike.  During my failed attempts at living the awe-inspiring and lucrative dream of a domestic US professional bike racer, I had a few good race results – well, maybe only two, but who’s counting!  There were some key things, for me, which allowed the achievement of most of my modest goals along the way.  The most important key was simply having the discipline and desire to ride my bike - a lot.  The second ingredient was having a good coach to nudge me in the right direction and tailor my training program specifically to my needs.  It didn’t hurt that my coach was also my brother (former Prime Alliance Director Sportif, Kirk Willett) and wintertime training partner for the better part of the 90’s.  There’s no motivation like having your coach call you up to schedule the daily ride when there’s twelve inches of snow on the ground and the mercury is hovering below zero.

Last Updated on Thursday, 26 April 2012 17:43

Zipp 950 Disc vs Wheel Cover

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In 2003 I tested a CH aero wheel cover (that company has since been bought out by wheelbuilder, where the price instantaneously went up from a reasonable $40 up to $80+) against a Zipp 950 disc in the Texas A&M wind tunnel.

That test and trip to Texas probably cost me around $5000 (off the top of my head)...seeing as how that is a sizable chunk of change, I requested anyone who viewed that data sign a non-disclosure agreement.  Y'know, cuz, I'm a capitalist and all!  :-)


bicycle wheel review and ratings

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Over the years, BTR has tested many wheels in a variety of wind tunnels (hey, we've been doing this thing since 1999 as independents and also as industry insiders!), and so, we've got some empirical data upon which we can take a stab at doing the sort of thing that follows...which is tabulating a review/ranking of over 150 front wheels.

Last Updated on Tuesday, 12 June 2012 03:20

Base: A New Definition

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Words and Images by:  Kirk Willett 

“Base” is defined by the American Heritage Dictionary as a fundamental principle or underlying concept of a system or theory.  Cycling performance does indeed have such a base, though its popular definition in cycling circles has blurred the concept by focusing on large volumes of lower powered riding.  The performance-rooted cycling definition of base is simply power at “threshold”.  Power at “threshold” has many definitions, but I define it as 20 minute mean maximal power or 20MP.

Last Updated on Tuesday, 23 February 2010 03:41
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