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


Go Back   > >

"The 33"-Road Bike Racing We set this forum up for our members to discuss their experiences in either pro or amateur racing, whether they are the big races, or even the small backyard races. Don't forget to update all the members with your own race results.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 01-30-09, 09:11 AM   #1
substructure
RustyTainte
Thread Starter
 
substructure's Avatar
 
Join Date: Jul 2005
Location: 28012
Bikes: zilch
Posts: 12,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
PowerTap wiggs out when it's cold

Any ideas? I'm not talking about real low temps, just low 30s or so. The computer doesn't register anything just gives me dashes across the watts and speed.
substructure is offline   Reply With Quote
Old 01-30-09, 09:14 AM   #2
wfrogge
Senior Member
 
Join Date: Feb 2007
Bikes:
Posts: 3,917
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Dont ride in the cold


wfrogge is offline   Reply With Quote
Old 01-30-09, 09:16 AM   #3
substructure
RustyTainte
Thread Starter
 
substructure's Avatar
 
Join Date: Jul 2005
Location: 28012
Bikes: zilch
Posts: 12,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by wfrogge View Post
Dont ride in the cold


And lose all my HTFU points?
substructure is offline   Reply With Quote
Old 01-30-09, 09:19 AM   #4
wfrogge
Senior Member
 
Join Date: Feb 2007
Bikes:
Posts: 3,917
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Didnt think about that.....


My PT does goofy stuff like this when the temp gets around or below 32. This winter I have been living with it /shrug.
wfrogge is offline   Reply With Quote
Old 01-30-09, 09:19 AM   #5
MDcatV
Senior Member
 
Join Date: Dec 2006
Bikes:
Posts: 6,760
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
same here. I roll out of the house, have readings, then after about 10 minutes, nothing but dashes. I figure that's the amount of time it takes for the ptap to cool down from the interior to exterior temps.

powertaps, if ever a more fickle piece of equipment was made ...

edit: friend with a quarq (spelling) has expressed similar experience. I havent researched it, but I suspect that strain guages are rendered less to ineffective by temperature.

Last edited by MDcatV; 01-30-09 at 09:24 AM.
MDcatV is offline   Reply With Quote
Old 01-30-09, 09:33 AM   #6
substructure
RustyTainte
Thread Starter
 
substructure's Avatar
 
Join Date: Jul 2005
Location: 28012
Bikes: zilch
Posts: 12,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Well shoot. We're training tomorrow and it's going to be cold. Back to the basics I guess.
substructure is offline   Reply With Quote
Old 01-30-09, 09:35 AM   #7
gogoturtle
Ouch!
 
gogoturtle's Avatar
 
Join Date: Jan 2006
Location: MD/DC/VA
Bikes:
Posts: 65
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Same here. It seems fine for a while that totally flips out. The power readings seem to jump all around, sometimes too high and other times too low. This tends to happen at or near freezing. I am hoping this goes away when the weather here in the Mid-Atlantic warms up a bit. It's going to be near 50 on Sunday, so . . . .
gogoturtle is offline   Reply With Quote
Old 01-30-09, 09:50 AM   #8
waterrockets 
Making a kilometer blurry
 
waterrockets's Avatar
 
Join Date: May 2006
Location: Austin (near TX)
Bikes: rkwaki's porn collection
Posts: 26,130
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Hmm. Mine stays out in the garage all night, and I've had a dozen commutes this winter in the 27-32F range and the PT has been fine (with a slightly dimmed display). I've never had a cold-related drop.

Are you guys storing them inside overnight? I wonder if it doesn't like the big temp change.
waterrockets is offline   Reply With Quote
Old 01-30-09, 09:51 AM   #9
ridethecliche
Village Idiot
 
Join Date: Jan 2007
Location: Bahstaaaaan
Bikes:
Posts: 20,241
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by MDcatV View Post
same here. I roll out of the house, have readings, then after about 10 minutes, nothing but dashes. I figure that's the amount of time it takes for the ptap to cool down from the interior to exterior temps.

powertaps, if ever a more fickle piece of equipment was made ...

edit: friend with a quarq (spelling) has expressed similar experience. I havent researched it, but I suspect that strain guages are rendered less to ineffective by temperature.
My SRM has yet to crap out in the cold. I have to rezero it, but it doesn't seem to care how cold it is. Yet anyway.
ridethecliche is offline   Reply With Quote
Old 01-30-09, 09:51 AM   #10
substructure
RustyTainte
Thread Starter
 
substructure's Avatar
 
Join Date: Jul 2005
Location: 28012
Bikes: zilch
Posts: 12,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Inside. But it took about 10 miles before it gave me the dashes. Then that's all she wrote. No data today to upload.
substructure is offline   Reply With Quote
Old 01-30-09, 09:57 AM   #11
dmotoguy
Edificating
 
dmotoguy's Avatar
 
Join Date: Aug 2005
Location: Portland
Bikes: Spooky + Sachs
Posts: 2,446
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by waterrockets View Post
Hmm. Mine stays out in the garage all night, and I've had a dozen commutes this winter in the 27-32F range and the PT has been fine (with a slightly dimmed display). I've never had a cold-related drop.

Are you guys storing them inside overnight? I wonder if it doesn't like the big temp change.
could be it....

I leave my bike in the garage and have not had any problems with many days in the 20-35F range..
dmotoguy is offline   Reply With Quote
Old 01-30-09, 09:59 AM   #12
seanmdo
Senior Member
 
seanmdo's Avatar
 
Join Date: Mar 2008
Location: The Bottom
Bikes: CAAD9, Specialized Transition, Van Dessel Drag Strip Courage
Posts: 175
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Move to Miami.
seanmdo is offline   Reply With Quote
Old 01-30-09, 10:00 AM   #13
cslone
Quarq shill
 
cslone's Avatar
 
Join Date: Jul 2004
Location: Ohio
Bikes: 08 Felt F4, 05 Fuji Team SL, 08 Planet X Stealth, 10 Kona Jake the Snake, 03 Giant OCR flat bar.
Posts: 3,962
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I keep all my bikes in the finished basement and had ridden my PT SL down to 24 degree with no issue but the dim display. My Quarq has been down to 26 with no problems at all.
cslone is offline   Reply With Quote
Old 01-30-09, 10:00 AM   #14
bdcheung
Carpe Diem
 
bdcheung's Avatar
 
Join Date: Sep 2006
Location: MABRA
Bikes: 2007 CAAD9; 2014 CAADX; PedalForce CG1
Posts: 13,147
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by seanmdo View Post
Move to Miami.
Or LA
__________________
"When you are chewing the bars at the business end of a 90 mile road race you really dont care what gear you have hanging from your bike so long as it works."
ΛΧΑ ΔΞ179 - 15% off your first Hammer Nutrition order!
bdcheung is offline   Reply With Quote
Old 01-30-09, 10:08 AM   #15
ericm979
Senior Member
 
ericm979's Avatar
 
Join Date: May 2007
Location: Santa Cruz Mountains
Bikes:
Posts: 6,170
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Are the hub batteries fresh? Cold batteries produce less power.
If you have an earlier SL wireless model, you may need the upgrade that fixes the dropping out problem. I got that done to mine and it's been completely reliable since.
ericm979 is offline   Reply With Quote
Old 01-30-09, 10:10 AM   #16
merlinextraligh
pan y agua
 
merlinextraligh's Avatar
 
Join Date: Aug 2005
Location: Jacksonville
Bikes: Wilier Zero 7; Merlin Extralight; Co-Motion Robusta; Schwinn Paramount; Motobecane Phantom Cross; Cervelo P2; Motebecane Ti Fly 29er; Calfee Dragonfly Tandem
Posts: 29,126
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
+1 on the batteries.
__________________
You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.
merlinextraligh is offline   Reply With Quote
Old 01-30-09, 10:16 AM   #17
cslone
Quarq shill
 
cslone's Avatar
 
Join Date: Jul 2004
Location: Ohio
Bikes: 08 Felt F4, 05 Fuji Team SL, 08 Planet X Stealth, 10 Kona Jake the Snake, 03 Giant OCR flat bar.
Posts: 3,962
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
There aren't any hills in LA.
cslone is offline   Reply With Quote
Old 01-30-09, 10:26 AM   #18
johnybutts
Senior Member
 
johnybutts's Avatar
 
Join Date: May 2008
Location: Houston, TX
Bikes: Type of horse.
Posts: 3,296
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by cslone View Post
There aren't any hills in LA.
false statement

</parody>
johnybutts is offline   Reply With Quote
Old 01-30-09, 01:21 PM   #19
heads up!
ultimate cat
 
heads up!'s Avatar
 
Join Date: Nov 2006
Bikes: CAAD9
Posts: 687
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm thinking the batteries are to blame. And aren't all you guys in cold temps putting your bike outside before you ride to acclimate the strain gauges to the temperature change? If your head unit zero's the torque when the internal hub temp is 80 degrees, your readings an hour later when the hub is 20 degrees are going to be off.

First, replace your batteries on head unit and hub - make sure they're the proper lithium or silver oxide, not alkaline, versions. Second, put your wheel or your whole bike outside at least 30min or so before you're going to ride and re-zero the torque at that point.
heads up! is offline   Reply With Quote
Old 01-30-09, 02:03 PM   #20
seanmdo
Senior Member
 
seanmdo's Avatar
 
Join Date: Mar 2008
Location: The Bottom
Bikes: CAAD9, Specialized Transition, Van Dessel Drag Strip Courage
Posts: 175
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yeah. If my wife would let us move that far from her family on the East coast, I would move to LA over Miami.
seanmdo is offline   Reply With Quote
Old 01-30-09, 02:06 PM   #21
bdcheung
Carpe Diem
 
bdcheung's Avatar
 
Join Date: Sep 2006
Location: MABRA
Bikes: 2007 CAAD9; 2014 CAADX; PedalForce CG1
Posts: 13,147
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
LA's not that far from the east coast.
__________________
"When you are chewing the bars at the business end of a 90 mile road race you really dont care what gear you have hanging from your bike so long as it works."
ΛΧΑ ΔΞ179 - 15% off your first Hammer Nutrition order!
bdcheung is offline   Reply With Quote
Old 01-30-09, 02:08 PM   #22
substructure
RustyTainte
Thread Starter
 
substructure's Avatar
 
Join Date: Jul 2005
Location: 28012
Bikes: zilch
Posts: 12,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yeah, Louisiana is only 750 miles from me. But the place is nasty humid in the summer.
substructure is offline   Reply With Quote
Old 01-30-09, 02:17 PM   #23
kudude
slow up hills
 
kudude's Avatar
 
Join Date: Mar 2006
Location: Seattle, WA
Bikes: Giant TCR, Redline CX, Ritchey Breakaway, Spec S-works epic
Posts: 4,931
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by johnybutts View Post
false statement

</parody>
kudude is offline   Reply With Quote
Old 01-30-09, 07:14 PM   #24
ZeCanon
Writin' stuff
 
ZeCanon's Avatar
 
Join Date: Feb 2007
Location: Boulder, CO
Bikes:
Posts: 3,782
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
This has happened to me twice, both times new batteries solved the problem. They were getting low anyway (about 8 months of use both times) and the cold just pushed them over the edge.
ZeCanon 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 07:27 AM.