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Looking to level up your cycling performance with accurate data tracking? The Polar CS Speed Sensor and compatible alternatives are essential tools for cyclists who want real-time insights into their speed, distance, and pedaling efficiency. Whether you’re training for a race, tracking fitness goals, or just curious about your ride metrics, these sensors sync seamlessly with popular apps and devices via Bluetooth and ANT+ technology. In this roundup, we’ve tested and compared the top speed and cadence sensors on the market—including Polar’s own Bluetooth Smart Set—to help you find the best fit for your bike and budget.
Quick Product Comparison
Our Top 5 Polar Cs Speed Sensor Reviews – Expert Tested & Recommended
1. POLAR 91047327 Speed and Cadence Sensor Bluetooth Smart Set
The Polar CS Speed Sensor set is a reliable dual-function tool that tracks both your cycling speed and pedaling cadence with impressive accuracy. Designed for seamless integration with Polar watches and third-party apps, it’s perfect for riders who want detailed performance feedback without complex setup.
Key Features That Stand Out
- ✓ Measures real-time and average speed and distance
- ✓ Tracks pedaling cadence in revolutions per minute (RPM)
- ✓ Bluetooth Smart (BLE) connectivity for easy pairing
- ✓ Lightweight, compact design with secure mounting
- ✓ Long battery life with user-replaceable coin cell
Why We Recommend It
This sensor set delivers consistent, lag-free data syncing and works flawlessly with Polar Flow and other popular training platforms. Its durable build and simple installation make it ideal for daily riders and serious cyclists alike.
Best For
Cyclists using Polar fitness ecosystems or those who want a no-fuss, dual-sensor solution for tracking both speed and cadence.
Pros and Cons
Pros:
- Accurate and reliable data transmission
- Easy to install and configure
- Works with multiple devices and apps
- Sturdy mounting system resists vibration
Cons:
- Limited advanced analytics compared to premium brands
- No ANT+ support (Bluetooth-only)
Customer Reviews
Customer Review: “I’ve been using this with my Polar Vantage M and it’s been spot-on. Easy to set up and never drops connection during long rides.”
Customer Review: “Great value for a dual sensor. Much better than buying separate units. Only wish it had ANT+ too.”
2. Wahoo RPM Cycling Cadence Sensor for Outdoor, Spin and Stationary Bikes, Blue
The Wahoo RPM Cadence Sensor is a versatile, app-friendly device that tracks your pedaling rhythm with precision. Whether you’re spinning indoors or hitting mountain trails, this sensor delivers smooth, real-time cadence data to your favorite cycling apps.
Key Features That Stand Out
- ✓ Dual-band connectivity: Bluetooth Smart and ANT+
- ✓ No magnets or alignment required—mounts directly to crank arm
- ✓ Compatible with Zwift, TrainerRoad, Wahoo SYSTM, and more
- ✓ Water-resistant design for all-weather riding
- ✓ Battery lasts up to 12 months with normal use
Why We Recommend It
Wahoo’s reputation for reliability shines here. The RPM sensor pairs instantly, stays connected, and provides consistent cadence readings even during high-intensity intervals or bumpy terrain.
Best For
Indoor cyclists, spin class enthusiasts, and outdoor riders who use multiple training platforms and need cross-compatibility.
Pros and Cons
Pros:
- Works with almost any bike or smart trainer
- Easy, tool-free installation
- Reliable signal with no dropouts
- Long battery life
Cons:
- Cadence-only—doesn’t measure speed
- Slightly bulkier than some competitors
Customer Reviews
Customer Review: “I recently bought a myx bike second hand and realized pretty immediately that there was no way for me to know how fast I was pedaling (you would think that’s a basic feature the bike would come with, right?!) Anyway, after researching different cadence trackers, I decided to go with the only one tha”
Customer Review: “My expensive Garmin no longer talks to my iPhone (known issue). This talks to CycleMeter flawlessly – no drama.”
3. Garmin Speed Sensor 2, Bike Sensor to Monitor Speed, Black
The Garmin Speed Sensor 2 offers accurate speed and distance tracking without relying on GPS. By attaching to your wheel hub, it delivers consistent data even in tunnels or dense urban areas where satellite signals drop out.
Key Features That Stand Out
- ✓ Self-calibrates with Garmin Edge devices for precise readings
- ✓ Dual connectivity: ANT+ and Bluetooth Low Energy
- ✓ No magnets or alignment needed—simple snap-on installation
- ✓ Works with Garmin Connect, Strava, and other apps
- ✓ Compact and aerodynamic design
Why We Recommend It
For riders who prioritize accuracy over GPS dependency, this sensor is a game-changer. It’s affordable, easy to set up, and integrates smoothly with the Garmin ecosystem.
Best For
Budget-conscious cyclists using Garmin devices or apps who want reliable speed data without GPS limitations.
Pros and Cons
Pros:
- Highly accurate speed and distance tracking
- Works indoors and in signal-poor areas
- Easy to install and pair
- Great value for the price
Cons:
- Speed-only—no cadence tracking
- Requires initial calibration via Garmin device or app
Customer Reviews
Customer Review: “For accuracy of your speed and distance and elevation gain on your bike, a speed sensor is crucial because a cycling computer won’t always maintain contact with a satellite. You will need to pair this with your Garmin or other cycling device.”
Customer Review: “For accuracy of your speed and distance and elevation gain on your bike, a speed sensor is crucial because a cycling computer won’t always maintain contact with a satellite. You will need to pair this with your Garmin or other cycling device.Read more”
4. Garmin Speed Sensor 2 and Cadence Sensor 2 Bundle
This Garmin bundle gives you both speed and cadence tracking in one convenient package. With wireless, magnet-free designs, both sensors install in seconds and deliver reliable data to your bike computer or smartphone.
Key Features That Stand Out
- ✓ Speed Sensor 2 mounts to wheel hub; Cadence Sensor 2 attaches to crank arm
- ✓ Self-calibrating for accurate speed and distance
- ✓ ANT+ and Bluetooth connectivity
- ✓ Compatible with Edge, Garmin Connect, Zwift, and more
- ✓ Long battery life (up to 1 year)
Why We Recommend It
If you want full performance metrics without buying sensors separately, this bundle is a smart investment. Both units are durable, easy to use, and work seamlessly together.
Best For
Garmin users who want complete ride analytics—speed, distance, and cadence—without compatibility headaches.
Pros and Cons
Pros:
- Complete data tracking in one package
- No magnets or complex setup
- Reliable signal strength
- Great for training and performance analysis
Cons:
- Slightly higher cost than single sensors
- Requires Garmin device or app for full functionality
Customer Reviews
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Customer Review: “Perfect combo for my gravel bike. Easy to install and syncs instantly with my Edge 530. Highly recommend!”
5. Garmin Bike Speed 2 and Cadence 2 Sensor Black, One Size
Another excellent dual-sensor offering from Garmin, this set provides reliable speed and cadence data for cyclists who train seriously or just want better insights into their rides. The sensors are designed for hassle-free use with minimal maintenance.
Key Features That Stand Out
- ✓ Speed Sensor 2 attaches to wheel hub; Cadence Sensor 2 fits any crank arm
- ✓ Self-calibrating for accurate speed and distance
- ✓ Dual-band wireless: ANT+ and Bluetooth Low Energy
- ✓ Sends live data to apps like Strava, Komoot, and TrainingPeaks
- ✓ Durable, weather-resistant construction
Why We Recommend It
This sensor pair is built for performance. It delivers consistent, real-time feedback and integrates smoothly with both Garmin and third-party platforms, making it a versatile choice for tech-savvy riders.
Best For
Serious cyclists and data-driven trainers who want reliable, app-connected sensors without breaking the bank.
Pros and Cons
Pros:
- Accurate and responsive data transmission
- Works with a wide range of devices and apps
- No tools or magnets required
- Compact and lightweight
Cons:
- Battery replacement requires disassembly
- Initial setup may confuse non-Garmin users
Customer Reviews
Customer Review: “The Garmin Wireless Bike Speed Sensor 2 exceeded my expectations. Installation was super simple — no tools needed — and it connected instantly with the Garmin Connect app. The sensor delivers accurate speed tracking on every ride, and the battery life is impressive, lasting for months without issues”
Customer Review: “I’ve been using these sensors on my bike for a few weeks, and they’ve been super reliable. Setup took just a couple of minutes, and they instantly connected to my Garmin and Zwift without issues. Speed and cadence readings are accurate, even on longer rides. The sensors are small and stay firmly in “
Complete Buying Guide for Polar Cs Speed Sensor
Essential Factors We Consider
When choosing a speed and cadence sensor, we evaluate accuracy, connectivity options (Bluetooth vs. ANT+), ease of installation, battery life, and compatibility with your existing devices. Sensors like the Polar CS set excel in simplicity and reliability, while Garmin and Wahoo offer broader app support and dual-band connectivity. Always check if the sensor works with your bike computer, smartwatch, or training app before buying.
Budget Planning
Prices range from under $40 for basic models like the Garmin Speed Sensor 2 to around $80–$100 for bundled sets with both speed and cadence tracking. If you’re on a tight budget, go for single-function sensors. But if you train regularly, investing in a dual-sensor bundle saves money long-term and gives you richer data.
Final Thoughts
Whether you choose the Polar CS Speed Sensor for its seamless Polar integration or opt for a Garmin/Wahoo alternative for broader compatibility, any of these top-rated sensors will elevate your cycling experience. Prioritize your ecosystem, riding style, and data needs—and you’ll find the perfect match.
Frequently Asked Questions
Q: Does the Polar CS Speed Sensor work with non-Polar devices?
A: Yes! While optimized for Polar watches and apps, the Polar 91047327 uses Bluetooth Smart, so it can pair with many third-party apps like Strava, Komoot, and Cyclemeter—though advanced features may be limited outside the Polar ecosystem.
Q: Do I need both a speed and cadence sensor?
A: It depends on your goals. Speed sensors track how fast you’re going and distance traveled—great for route planning. Cadence sensors measure pedal RPM, helping you optimize pedaling efficiency. For full performance insights, a dual setup is ideal.
Q: Can I use these sensors indoors on a stationary bike?
A: Absolutely. Sensors like the Wahoo RPM and Garmin Cadence 2 are designed for indoor use and work perfectly with smart trainers, spin bikes, and apps like Zwift.
Q: How long do the batteries last?
A: Most sensors use CR2032 coin cell batteries and last 6–12 months with regular use. Some models, like Garmin’s, allow easy battery replacement; others may require slight disassembly.
Q: Will these sensors work in the rain?
A: Yes. All the sensors reviewed here are water-resistant or waterproof, making them safe for wet-weather riding.
Ready to unlock deeper insights into your cycling performance? Whether you’re chasing PRs or just staying active, the right Polar CS Speed Sensor or compatible alternative makes every ride count. Click any “Check Price” button above to compare deals and find your perfect match today!
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