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?

recursive

Battery is dying?

Bad cable?

92degrees

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.

recursive

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.

92degrees

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.

Skinny Fred

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.

92degrees

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.

Skinny Fred

On a whim, I changed the setting back to Pedal only, and it's been working fine.

Snicklefritz

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...

robintosh

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