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Annoying problem on today's ride - the garmin wouldn't consistently read the speed I was going, resulting in some hilarious moments where it couldn't decide between GPS or the wheel sensor and then told me I was going 120 MPH. Wheee

Anyone come across a problem like this before? I'm guessing it's a dodgy connection with the wheel sensor... it was reading cadence just fine, and I swapped the battery for a new one and was still getting the problem. The arm was as close to the magnet as I could safely get it - closer than I'd usually have it in fact.

Any thoughts?

5 comments

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Bagpuss [99 posts] 3 years ago
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Always been the battery when mine has done the same. Think I remember reading somewhere that the wiring for the sensor arm was prone to corrosion, might be worth carefully dismantling it and checking.

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bashthebox [751 posts] 3 years ago
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Hmm, yeah I was wondering about that. I had just given my bike a deep clean the day before; I wonder if I'd managed to get some goop in the connection?

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Cycle_Jim [264 posts] 3 years ago
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Check that your wheel size is set right? Mine wasn't and kept giving incorrect read outs

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slowboy [5 posts] 3 years ago
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I had exactly the same problem - new sensor needed in the end but no problems since.

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cidermart [489 posts] 3 years ago
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Definitely sounds like dirty/wet connection issue. Pop the battery and flood it with WD40 empty it out and try it again other than that ‘how old? Warranty claim’ or a new one.