Garmin GSC 10 Speed and Cadence Sensor

Priced: $49.95 Rated:   - 4 stars out of 5 by 15 reviews.
Garmin GSC 10 Speed and Cadence Sensor
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Color: Sensor Mounted On Frame
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Garmin GSC 10 Speed and Cadence Sensor -

The Garmin GSC 10 Speed and Cadence sensor measures your pedaling strokes per minute, providing valuable cycling training feedback.

Compatible GPS Receivers: Colorado 300, Colorado 400c, Colorado 400i, Colorado 400t, Dakota 20, Edge 305, Edge 500, Edge 705, Edge 800, Forerunner 305, Forerunner 310XT, Forerunner 405, Forerunner 405CX, Forerunner 410, Forerunner 50, Forerunner 610, Foretrex 401, FR60, GPSMAP 62, GPSMAP 62s, GPSMAP 62st, Oregon 300, Oregon 400c, Oregon 400i, Oregon 400t, Oregon 450, Oregon 450t, Oregon 550, Oregon 550t, Etrex 30, both Forerunner 910XT’s, Montana 650t, Montana 650, Montana 600



  • Also compatible with Etrex 30, both Forerunner 910XT’s, Montana 650t, Montana 650 and Montana 600
  • Performance cyclists know it's more efficient energy usage to maintain a set cadence than chase a set speed over varying terrain; GSC 10 makes it easy
  • As well as GPSMAP 62, GPSMAP 62s, GPSMAP 62st, Oregon 300, Oregon 400c, Oregon 400i, Oregon 400t, Oregon 450, Oregon 450t, Oregon 550 and Oregon 550t
  • Garmin GSC 10 Speed and Cadence sensor weighs 1.3 oz. and measures 2.75 x 1 in.
  • Also works with Forerunner 305, Forerunner 310XT, Forerunner 405, Forerunner 405CX, Forerunner 410, Forerunner 50, Forerunner 610, Foretrex 401 and FR60
  • Self-calibrating, wireless unit works with Colorado 300, Colorado 400c, Colorado 400i, Colorado 400t, Dakota 20, Edge 305, Edge 500, Edge 705 and Edge 800 Top 25 Category Product
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Garmin GSC 10 Speed and Cadence Sensor Reviews:

Positive Reviews:

Once you get it working it's good.

I bought a Forerunner for running, but since I do a bit of triathlon and commute on my bike, i thought I'd spring for the sensor so I could measure my cadence (my bike computer doesn't measure that).

It's a relatively simple bit of kit. A magnet for the wheel and a sensor that you fasten to the bike, and another sensor on the pedals.

The setup in theory is simple, all 3 pieces 'synch' when colored lights flash as the pedal and wheel pass by. Boy did I have issues. The pedal one synched fine, but the wheel one just wouldn't synch. I had it to within a hairs breadth and still it wasn't working. After googling it, I did a reset and since then it's worked flawlessly.

Performance wise the speed and distance appear spot on - seems even more accurate than my bike computer (note to self - change wheel size on computer).

Haven't used it in the rain, so intrigued by the overall water resistance and longevity, but it's a nice piece of kit.
Portland Jock at REI on 03/03/2013

Great addition to Forerunner 305

I picked this up on a REI used gear sale. Didn't know if it would work with my Forerunner 305...but it did. Once you get the concept of the two for speed and one for cadence it makes it alot easier to install...took me a while on that one. I think the directions could explain it better. Once you sync it...make sure you hit the reset button...have your watch scanning for the device...and spin the wheel to engage the magnets it syncs. You never have to sync it again...just turn on the Garmin and it finds it. It's great to not have to run wires on your bike. I'm going to pick up the mount for my watch so I don't have to keep looking at my wrist. It would be nice if this product with a bracket that attached to the handlebars for your watch.
Pat the Marine at REI on 03/03/2010

Fantastic Device

I recently tried the Timex Speed/Cadence sensor which is horribly difficult to get working.

In comparison, the Garmin Speed/Cadence sensor is superior in every way.

1) It's a single device instead of separate sensors

2) Install couldn't be easier - the speed sensor arm rotates toward the tire and tightens with a screw - excellent engineering by Garmin's team!

3) The device includes sensor guide lines on the device so you can be sure the sensors/magnets are in EXACTLY the right place

I use this device with my Timex Global Trainer GPS watch. Unlike Timex's Speed/Cadence sensor, the Garmin synced INSTANTLY with my watch and both sensors worked perfectly on the first attempt.

I couldn't recommend this device more - kudos to Garmin's team for a wonderful piece of engineering.
PaulEHarvey at REI on 03/03/2011

Works well, supplements GPS signal

I use this with a Garmin Edge 305 on my road bike. Cadence works great and seems very responsive to changes in RPM. In low GPS coverage (heavy tree canopy) the speed sensor keeps my ride distance accurate within reason. I did have it loose synchronization with my Edge after I washed my bike. I thought I'd killed it. An email to Garmin was pretty quickly responded to with instructions on how to re-sync which resolved the problem. Waterproofing seems very good and it is a simple effective design which will even work with a trainer since it reads the speed off the rear wheel.
MRH at REI on 10/10/2008

Great for road or trainer

Purchased with the hopes I could pair with my Forerunner 305 and capture speed/cadence data while on the trainer. I couldn't find any reviews to confirm if this would work while indoors and stationary. I just finished setting up (very quick and easy) and can verify both functions work. Forerunner switches to indoor mode, but displays heart-rate, speed and cadence which is fantastic for tracking my effort on the trainer! I will likely move this to my road bike in the spring as well. Highly recommend.

I have given 5 stars, hopefully the long-term performance and durability will live up to that rating.
LJM at REI on 01/01/2011

Great Device!

I recently purchased a Kinetic Trainer to give me an indoor training option. Wanting to know how many miles I ride when on the trainer I paired the GSC 10 with my Garmin Forerunner 305 and everything works perfectly! The installation and pairing was simple, the instructions easy to follow, and the GSC 10 / Forerunner 305 / Kinetic Trainer combination provides me with an indoor workout that yields the same data (speed, distance, heart rate, etc.) as when I cycle outdoors.
VanDuck at REI on 04/04/2012

Garmin GSC 10 Speed and Cadence Sensor

Have used one with a Garmin Edge on a full suspension mountain bike (two years 7,000 miles) and one with a cross bike (two months) and it performs well on both bikes in all weather conditions. Some folks have switched to a cheap rare earth magnet in place of the strap-on magnet that comes with the sensor. (Allows alternate placement due to strength of the magnet).
RickB at REI on 10/10/2010

Nice product!

Bought this to go with my Forerunner 50. The 50 was pure junk so I returned it and bought a 305. Together they make a great pair for my road bike. Gives me cadence and when I'm on a trainer it gives me speed. It was easy to mount and sync, once that's done you can forget about it, it just works.
jimiC at REI on 03/03/2009

Bost combo sensor out there

This is my second sensor. The first one died due to getting the internals wet on an extremely rainy day. Garmin replaced it immediately and the unit has been running flawlessly for over a year, without exception. The Garmin sensor is the only combo speed/cadence sensor that works. Have used a couple from CatEye which failed within weeks.
parrotheadnw at REI on 08/08/2009

Works Well on Road Bikes

Works well on road bikes and stiff-tail mountain bikes. For full suspension mountain bikes, which I use for commuting, the mounting does not place the cadence sensor in the proper position for use. There needs to be an auxiliary mount for fully suspended bikes.
dlanotte at REI on 01/01/2009

Negative Reviews:

Needs improvment

I was excited to get this to go with my Forerunner 50 but the bottom line is it doesn't work well at all.
The sensor stops sending data relatively quickly, like while waiting for a stop light, once you stop pedaling and does not start back up automatically. So I've had quite a few rides where all data post stop light was lost. On top of that the arm with the speed sensor broke after 5 months and now the thing is useless, won't even read cadence even though it's the speed sensor that broke.
AdventureDave at REI on 08/08/2008

Good for Dry Season, Not Waterproof

I switched from a Blackburn model which i've used for two years and over 10,000miles to this one which only lasted ~2months. It worked fantastic when roads were dry but only until received its first rain. It has an "o-ring" that did not avoid water to soak the electronics.
Since i already have the Edge model, I decided to purchase another one and have a some silicone on top to avoid water intrussion. lets see.
JLG at REI on 09/09/2010

Neutral Reviews:

Compatability with Oregon 300

Works well and is easy to set up. I guess I should have read more about it before I purchased it since I was expecting that it would give me my speed as well as cadence on an Oregon 300 gps. You might not think that would matter since the gps gives you that anyway. Well, not on a staionary bike. It would be great to get cadence, speed, and heart rate for use as a fitness monitor. Maybe there is a way to do that, I will revise this review if I find a way.
D12 at REI on 12/12/2009