Garmin Cadence Sensor

by shrinkinbggaz   May 3, 2010  

I have killed 2 of these in 2 months of nothing but road riding, granted some of it has been in the rain but is it just me that kills them or is there a fault with how they are made ?

9 user comments

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I had problems with an earlier model which needed constant resetting (by holding in the white button and checking for flashing) between rides.

Have you checked the battery, contacts, etc?

posted by Old Cranky [278 posts]
3rd May 2010 - 18:49


I've not had any problems with mine, and I have three. One has been working for several thousand km of winter commuting. I need to replace the battery every 4000 km or so.

two wheels good; four wheels bad

posted by cat1commuter [1402 posts]
4th May 2010 - 19:55


These have a bit of a known issue (known amongst users rather than Garmin).

You usually find that it's after a wet ride that they may decide to get a bit uppity, and appear to have died. If you take the battery out and leave it and the cover off overnight, they tend to come back to life.

I have two, which I swap around as one fails, put the other one on, when that one decides to fail the old one will have revived. It appears to be mainly down to moisture in them, and just needs a bit of time to properly dry out.

Complicating matters since 1965

DaSy's picture

posted by DaSy [673 posts]
5th May 2010 - 11:45


I've also found if you leave the crankarm magnet OR wheel magnet near the sensor this can drain the battery pretty quick

jezzer's picture

posted by jezzer [65 posts]
14th May 2010 - 10:26


Ive got the cadence sensor on 2 of my bikes and swap my 705 unit between them. I only had this problem right at the start of my time using this product and also found that others had the same issue. The widely accepted remedy, as has been said here, is to stick the batetries somewhere dry and airy for a night after a very wet ride...ive not had a problem since doing this. I accept it because the cadence sensor is normally in line to get drenched when out in the wet and it is a fairly small, sensitive unit so I have learnt to live with its little flaws.

not all carbon is the same.

Jon Burrage's picture

posted by Jon Burrage [1081 posts]
14th May 2010 - 12:14


never thought to check the position of the crank arm/wheel sensor when hanging the bike up in the mancave.

I've had one of these replaced as the original one died...seems it just eats the battery up. The replacment seem fine so far (rode in all weathers).

posted by mrchrispy [378 posts]
14th May 2010 - 14:23



Thank you for that. You have solved a mystery that has been bugging me for a couple of weeks. Two new CR2032s flattened in quick succession had me wondering. Weather couldn't be to blame as this is on the turbo.

Ride24 19 & 20 June Fundraising for Action Medical Research.
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ibl's picture

posted by ibl [4 posts]
14th May 2010 - 14:30


My cadence sensor stopped working after 6 months. I contacted Garmin who weren't interested and told me to buy a new one. Poor aftersales service from a company that I would of expected more from. Stay clear of Garmin.

posted by D71 [52 posts]
4th August 2010 - 22:28


To be fair to garmin they are a massive global company who are distributed in many countries who are set-up to deal direct with shops so that might have been a better course of action. I know plenty of people who run Garmins with no issues and of the few friends who did a quick drop into the shop they got them from had the problem sorted in a few days/week.

STATO's picture

posted by STATO [441 posts]
6th August 2010 - 14:52