Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

User Tag List

Reply
 
Thread Tools Search this Thread
Old 09-10-05, 01:10 AM   #1
spinner5339
Senior Member
Thread Starter
 
Join Date: Apr 2003
Location: Brisbane
Bikes:
Posts: 156
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Power Tap Fixed Wheel

A group of roadies passed me this morning, I went to re dial the setting to keep up..then I realised I do not have power tap on my fixed wheel. Anybody has power tap on their fixie?
spinner5339 is offline   Reply With Quote
Old 09-10-05, 02:14 AM   #2
red house
Banned.
 
red house's Avatar
 
Join Date: Aug 2005
Location: In the stomach of a whale. :beer:
Bikes: Lemond Fillmore, Cmofalge black baby
Posts: 5,543
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
what a heck is a power tap? -it does sounds cool
red house is offline   Reply With Quote
Old 09-10-05, 03:01 AM   #3
11.4
Senior Member
 
Join Date: Jan 2005
Bikes:
Posts: 636
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've built a couple wheels for fixie and track riders on Powertap hubs. (These, by the way, are hubs that have pressure transducers inside that enable you to measure wattage output, which allows you to track your training and to test your output at different gearing, positions, etc. Very valuable if you're racing, interesting to know in a self-improvement perspective otherwise.) There are two ways to modify Powertaps for track -- one is to use the Shimano freehub to fixed conversion from Surly, and the second is to buy an actual re-machined Powertap hub. The former you can use with the new Powertap SL, and the latter is available (so far) only for the older all-aluminum Powertap. The primary advantage of the SL, in my mind, is that you can have a non-contact sensor that picks up the signal from the transducers through the carbon shell, rather than needing a continuous electrical contact through the side of the hub. It just makes the hub more reliable. That being said, the SL had some problems out of the box, which Powertap has supposedly dealt with at this point. Be sure your hub is a revised version if you go to an SL. The remachined one is completely adapted to track dimensions, including conversion from 130 to 120 mm.

They lace up just like any hub and you can read power, cadence, speed, heartrate, etc. all on one monitor on the handlebars. As an alternative, you can get an Ergomo for the same price, which I've found is a bit more accurate and slightly more reliable. It has the sensors incorporated into a Dura Ace 7700 series splined bottom bracket, so you can use current DA track cranks or 9-speed road cranks of any version. It's very elegant and about the same price as the SL. Then there's the SRM, which is outlandishly expensive but is the gold standard and works better than any of the others with transducers mounted in the right crank arm. Get a Dura Ace 10 version and use a DA-10 road crank as in a conversion rig, or there's a dedicated track version (which, however, is nowhere near as stiff). You can google for manufacturers and retailers for all of these systems.

Fun toys, and very valuable if you are racing seriously, but they all need care and are not exactly typical fixie gear. Oh, and you need a reasonably competent Windows computer with Windows XP to download data from all of them and analyze it (if you don't do this step, you miss the whole point of the units).
11.4 is offline   Reply With Quote
Old 09-10-05, 05:49 AM   #4
Aeroplane
jack of one or two trades
 
Aeroplane's Avatar
 
Join Date: Jun 2005
Location: Suburbia, CT
Bikes: Old-ass gearie hardtail MTB, fix-converted Centurion LeMans commuter, SS hardtail monster MTB
Posts: 5,637
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Wait, so if PowerTap is just a super-duper computer, how could changing the settings on it let you keep up with a pack of roadies? I am confused.
Aeroplane is offline   Reply With Quote
Old 09-10-05, 05:54 AM   #5
gorn
Senior Member
 
Join Date: Aug 2004
Location: Chi-troit
Bikes: [2004 Bianchi Eros] [1988 Colnago XL Fixed Gear Conversion]
Posts: 577
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
He's making fun of poseurs.
I am sorry I have to drop you because you look like Lance
Roadie poseurs, not hipster poseurs.
gorn is offline   Reply With Quote
Old 09-10-05, 08:14 PM   #6
spinner5339
Senior Member
Thread Starter
 
Join Date: Apr 2003
Location: Brisbane
Bikes:
Posts: 156
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
11.4, thanks for the details on power tap..all sounds a bit complicated and toyish for me, wouldn't it be easier just to measure the time for 200m?
spinner5339 is offline   Reply With Quote
Old 09-10-05, 09:33 PM   #7
tlupfer
...
 
tlupfer's Avatar
 
Join Date: Nov 2004
Location: Minneapolis, MN
Bikes:
Posts: 708
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by spinner5339
11.4, thanks for the details on power tap..all sounds a bit complicated and toyish for me, wouldn't it be easier just to measure the time for 200m?
no. that doesn't tell you how hard you worked to go 200m, only how fast you were able to do it.
tlupfer is offline   Reply With Quote
Old 09-10-05, 10:51 PM   #8
auk
Coasting makes you grumpy
 
Join Date: Oct 2003
Location: Indiana
Bikes: Specialized Stumpjumper M2Comp; Habanero Ti-Team; Slingshot Road; 1962 converted Raliegh fixer aka: The Beast
Posts: 1,376
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Very good post 11.4, thanks.
auk is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 08:19 AM.