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Edge 530 speed fluctuation when cadence sensor working

Former Member
Former Member over 4 years ago

Two month user of Edge 530 with speed sensor 2, cadence, and dual HRM sensors.  Installation was fine, first ride I had numerous sensor dropouts.  After looking at the forum I switched all communication to ANT+ and have not had any sensor dropouts since.  I have noticed that my indicated speed fluctuates dramatically (eg. when riding consistently at about 18-20mph I see values such as 12, 24, 6, 20, 12, 22, 28) to the point I have no idea what is going on.  After reading the forums it seemed like the most frequent place this issue occurred was on concrete roads (old and new, probably similar amounts of rebar) but not so much on asphalt roads.

Today on a group ride I started recording too long before we actually started so my cadence sensor wasn't detected and I couldn't stop to rescan.  This ride was done without the cadence sensor but everything else was the same on the bike, chain, hub, route, other riders.  The location is the outskirts of Houston, Tx.  Imagine my surprise when we got on some of the same concrete roads that I have had to guess my speed and the indicated speed now looked very appropriate as we accelerated from stop lights up to 23mph then held that speed for several miles.  The difference was so dramatic and lasted for the whole ride.

Is there a conflict between the speed 2 hub mounted sensor and the cadence sensor?  

  • Former Member
    0 Former Member over 4 years ago

    Hi everyone,  I hope this helps anyone struggling with the new Edge 530 trying to use the old GSC-10 Speed Cadence Sensor.  I can definitely report the GSC-10 DOES NOT provided consistent speeds with the new Garmin Edge 530 while it does provide consistent speeds and cadence data when paired with my old Edge 510.  Despite having spent $300 on the "new" technology of the Edge 530, I lost so much ride data that I had to repair my Edge 510 battery just to level set that the GSC-10 was not the cause of my speed and mileage data loss. Today I road with my Edge 510 paired with my GSC-10 and also had Strava running on my Apple 3 Watch.  The Edge 510 reported consistent speed with no drop outs, no mileage loss and all cadence data was all in tact.  I'm buying the new Garmin Sensor 2 Speed and Sensor 2 Cadence sensors today and if that doesn't solve my issue the new stuff is going back.  Happy and safe riding and pray for better QC next time.

  • Former Member
    0 Former Member over 4 years ago in reply to mcalista

    Not expecting any improvement, I went through the battery removal, short the contacts to drain any holdover power, delete the sensor, install the battery, pair the sensor, manually set the circumference.  On the same route, I experience the same wild fluctuation in indicated speed.  I also tried coasting for longer periods to see if the indicated speed would gradually come down.  Of course not, it still jumped all over the place.

    Rear hub, front hub, re-pair sensor, remove/replace battery, set manual circumference, nothing works.  I don’t think the technology is working right.

    The problem is most obvious on concrete roads that have embedded steel rebar (steel rods) for rigidity.  The problem is less obvious on asphalt roads without rebar.