"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.

Powertap not giving cadence?

Old 06-01-07, 07:13 AM
  #1  
92degrees
Senior Member
Thread Starter
 
Join Date: Aug 2004
Location: in the shade
Posts: 492

Bikes: too few

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Powertap not giving cadence?

Got home last night to find my avg cadence was "8" for the night. Seems the cadence function stopped after 15min and never came back. This morning I can't get a reading on cadence at all? Everything seems plugged-in and the magnet is aligned to the sender. Any other suggestions?
92degrees is offline  
Old 06-01-07, 07:16 AM
  #2  
recursive
Geosynchronous Falconeer
 
recursive's Avatar
 
Join Date: Sep 2004
Location: Sacramento, CA
Posts: 6,312

Bikes: 2006 Raleigh Rush Hour, Campy Habanero Team Ti, Soma Double Cross

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Battery is dying?

Bad cable?
__________________
Bring the pain.
recursive is offline  
Old 06-01-07, 07:22 AM
  #3  
92degrees
Senior Member
Thread Starter
 
Join Date: Aug 2004
Location: in the shade
Posts: 492

Bikes: too few

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Is there a battery in the sender? Sorry for being so mechanically daft -- but the Saris manuals are positively useless and so are their FAQs. The wire looks OK. Thanks.
92degrees is offline  
Old 06-01-07, 08:26 AM
  #4  
recursive
Geosynchronous Falconeer
 
recursive's Avatar
 
Join Date: Sep 2004
Location: Sacramento, CA
Posts: 6,312

Bikes: 2006 Raleigh Rush Hour, Campy Habanero Team Ti, Soma Double Cross

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
No, there's only a battery in the head computer and the hub as far as I know, unless you have one of the new wireless ones. Then all bets are off.

And FYI even wires that look ok can go bad if they've been flexed too much.
__________________
Bring the pain.
recursive is offline  
Old 06-01-07, 08:32 AM
  #5  
92degrees
Senior Member
Thread Starter
 
Join Date: Aug 2004
Location: in the shade
Posts: 492

Bikes: too few

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks. I spoke with customer service at Saris and they were puzzled. I'm betting on the wire and since it's only $7 for a new sensor I'll just have them send me one if it doesn't work on today's ride.
92degrees is offline  
Old 06-02-07, 09:34 AM
  #6  
Skinny Fred
Senior Member
 
Join Date: Nov 2006
Posts: 67
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Originally Posted by 92degrees
Got home last night to find my avg cadence was "8" for the night. Seems the cadence function stopped after 15min and never came back. This morning I can't get a reading on cadence at all? Everything seems plugged-in and the magnet is aligned to the sender. Any other suggestions?
I've had a prolonged problem with my PT cadence. I've been watching the forums for a few months for related posts, and this is the first one I've seen. I didn't realize that the cadence sensor was so cheap - I guess I'll contact Saris and get one. Being lazy, I set it to Pedal/Hub and left it at that.

The symptoms of my problem are somewhat different from yours. Sometimes (and now all of the time), the pedal cadence won't be detected on power-on. However, it's 100% once it's active - I have never dropped cadence mid-ride.

My current theory is that at least one of these is marginal: magnet strength, wire, and head unit battery. I was able to activate the cadence a few times by waving an extra wheel magnet over the sensor to simulate a high cadence. I tested the wire and sensor using a multimeter. I haven't changed the battery, but I've read that HR reception gets poor on low battery, and I haven't had any problems with that.

The sudden data drop sounds like you have a bad cable that failed during your ride.
Skinny Fred is offline  
Old 06-02-07, 04:59 PM
  #7  
92degrees
Senior Member
Thread Starter
 
Join Date: Aug 2004
Location: in the shade
Posts: 492

Bikes: too few

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
There was a small nick in the cable but none of the wires were broken. I put some shrink tubing over the area, aligned everything, and it's working now. I'll probably still get another sender as backup.
92degrees is offline  
Old 06-10-07, 09:17 AM
  #8  
Skinny Fred
Senior Member
 
Join Date: Nov 2006
Posts: 67
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Being lazy, I set it to Pedal/Hub and left it at that.
On a whim, I changed the setting back to Pedal only, and it's been working fine.

Last edited by Skinny Fred; 07-03-11 at 02:21 PM.
Skinny Fred is offline  
Old 06-10-07, 10:03 AM
  #9  
Snicklefritz
Senior Member
 
Snicklefritz's Avatar
 
Join Date: Mar 2005
Location: In the middle of horse country, in The Garden State
Posts: 3,159
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ive had a related problem. My powertap drops the cadence signal but does so in an intermittant way. There doesn't seem to be any rhyme or reason as to when it does this. Not sure what the deal is...
Snicklefritz is offline  
Old 06-16-07, 08:07 AM
  #10  
robintosh
Senior Member
 
Join Date: Sep 2004
Location: Santiago, Chile
Posts: 65

Bikes: Trek Madone SL 5.9

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
When using hub cadence, sometimes it can be way erratic (35-40 rpm while going 95-100 for example), that is usually fixed zeroing torque.

Rob
robintosh is offline  

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.