I biked 9 miles with the Fitbit Inspire 3 and Polar Vantage V3 — one was more accurate

Fitbit Inspire 3 and Polar Vantage V3 on the wrist of a cyclist.
(Image credit: Future)

As an avid city cyclist, I’ve lately been asking myself, “What’s the best fitness tracker for analyzing my bike rides?” To find out, I grabbed the two devices nearest to me on my desk and suited up for a chilly December ride. 

Those two devices happened to be the Fitbit Inspire 3 — a small and budget-friendly model aimed at casual users —  and the Polar Vantage V3, a more advanced fitness watch geared toward hardcore athletes. More importantly, the Fitbit costs ~$100, while the Polar is closer to $600. 

Despite the Fitbit’s underdog status, I had faith it could hold its own. After all, the device has proven itself a worthy opponent in past battles with pricier models, like the time it beat the Apple Watch 8 in a 6,000-step accuracy showdown

Inspire 3 vs. Vantage V3: Stats cyclists care about

Cyclists want similar post-workout stats to runners and hikers. At the end of my ride, I want to know how far I went, how much time I actually spent riding (as opposed to waiting at red lights), my maximum and average speeds, my elevation gain, max and average heart rates and calories burned. Oh, and a map of my route is also a nice touch. 

It’s worth noting that while both of these devices have a mode that tracks bike rides, only the Polar has an onboard GPS —  the Fitbit piggybacks off of a smartphone's connection. How does this impact our head-to-head test? Read on. 

Inspire 3 vs. Vantage V3: Performance

Based in Seattle, Washington, my 9.3-ish mile ride involved roughly 450 feet of elevation gain and took me across no fewer than two drawbridges and past Amazon’s corporate headquarters, an old Ford Model T factory, a busy seaplane airport and plenty of gorgeous city and mountain views. (Okay, it was a little overcast, so I didn't see too much). 

For this test, I also ran Strava on my smartphone, as I have in previous head-to-head tests, for an additional point of comparison. With a tracker on each wrist, my Lumos helmet (one of the best bike helmets) strapped snuggly to my head and my bike lights powered up, I peddled out. 

Swipe to scroll horizontally
Inspire 3 vs. Vantage V3 — the results
Row 0 - Cell 0 Fitbit Inspire 3Polar Vantage V3Strava
Time 52 minutes 50 seconds 52 minutes 38 seconds 48 minutes 24 seconds
Distancen/a9.16 miles9.30 miles
Elevation gain n/a480 feet 451 feet
Average speedn/a10.4 mph11.5 mph
Max speedn/a23.1 mph24.5 mph
Average heart rate 159 bpm160 bpmn/a
Max heart rate 181 bpm179 bpmn/a
Calories burned 682 calories 766 caloriesn/a

I was initially disappointed with the amount of post-ride data provided by the Inspire 3. However, when combined with Strava data, you get a similar level of analysis to the Polar Vantage V3, just not all in one place. That said, the Fitbit data can easily be synced with Strava recordings.

More importantly, across the board, between the two devices and Strava, there isn’t too much discrepancy in the health and fitness data recorded, which shows that all of these tracking methods are pretty darn accurate. 

Strava did record a shorter ride time, though. And I suspect that 48 minutes and 24 seconds is much closer to the amount of time I truthfully spent moving on the bike. How do I know this? I also ran a timer for my ride separately, which logged my total workout time at just around 53 minutes. 

Inspire 3 vs. Vantage V3: Verdict

A screenshot from the Polar Flow app.

The Polar Flow app shows all the post-ride metrics I care about in one handy place.  (Image credit: Future)

Ultimately, the Polar Vantage V3 wins this showdown. It accurately captured and shared all the ride information I care about in one easy-to-digest report. 

The Fitbit Inspire 3 was also accurate, but getting a complete picture of my bike ride requires running a secondary app (Strava), followed by syncing the two datasets. This is not hard, but also not ideal. 

Catch me rocking the V3 on future bike rides. 

More from Tom's Guide

Dan Bracaglia
Senior Writer, Fitness & Wearables

Dan Bracaglia is the Tom’s Guide editorial lead for all things smartwatches, fitness trackers and outdoor gear. With 15 years of experience as a consumer technology journalist testing everything from Oura Rings to instant cameras, Dan is deeply passionate about helping readers save money and make informed purchasing decisions. In the past year alone, Dan has assessed major product releases from the likes of Apple, Garmin, Google, Samsung, Polar and many others. 

An avid outdoor adventurer, Dan is based in the U.S. Pacific Northwest where he takes advantage of the beautiful surroundings every chance he gets. A lover of kayaking, hiking, swimming, biking, snowboarding and exploring, he also makes every effort to combine his day job with his passions. When not assessing the sleep tracking and heart rate accuracy of the latest tach gadgets, you can find him photographing Seattle’s vibrant underground music community.

Read more
The Samsung Galaxy Fit3 next to the Fitbit Inspire 3 on a user's wrist with each screen showing the total step count for the day
I walked 6,500 steps with Fitbit Inspire 3 vs. Samsung Galaxy Fit3 — here's the winner
The Samsung Galaxy Fit3 on a user's wrist next to the Amazfit Active 2 with each device showing a step-count total for the day; a green plant is out of focus behind the watches
I walked 5,500 steps with Samsung Galaxy Fit3 vs Amazfit Active 2: Here's the winner
Close-up of the Samsung Galaxy Fit3 next to the Fitbit Inspire 3 in a user's hand
Samsung Galaxy Fit3 vs Fitbit Inspire 3: Which budget fitness tracker should you buy?
Close up of a Fitbit Charge 6 with an orange band on a user's wrist next to an Apple Watch 10 with an out-of-focus green background
I walked 5,000 steps with the Apple Watch 10 vs. Fitbit Charge 6 — this device was more accurate
Polar Vantage M3 close up of the main watch face with the device resting on a ski mountain map
Polar Vantage M3: 5 things I like about this sporty adventure GPS watch and 3 things I don’t
set a goal on the Fitbit Charge 6
We've tested the best cheap fitness trackers available right now
Latest in Fitness Trackers
The Circular Ring 2, up close, with half of the device slightly obstructed by orange glass in the foreground
Circular Ring 2 is now available to pre-order — and you could save up to $310 right now
Garmin golf watch
I played a golf round with the Garmin Approach S50 smartwatch, and it's fantastic — here's why
Oura Ring 4 in Rose Gold held between a person's fingers
Oura Ring just got a huge new upgrade for women's health — what you need to know
Close up of the Amazfit Active 2 smartwatch next to the Fitbit Sense 2 with each showing the total step count for the day
I walked 6,000 steps with Fitbit Sense 2 vs Amazfit Active 2 — this one was more accurate
Close-up of the Amazfit Active 2 and Apple Watch SE next to each other on a user's wrist
I walked 7,000 steps with Apple Watch SE vs Amazfit Active 2 — here's the winner
Fitbit Charge 6 shown on man's wrist
Epic Fitbit sale at Amazon — our favorite fitness trackers are on sale from just $79
Latest in Features
The image shows a glass bowl, a tube of toothpaste, a bottle of liquid laundry detergent and a jar of baking soda on a wooden table
I tried the viral toothpaste and warm iron DIY mattress cleaning hack for brown stains — these are my results
A woman with dark curly hair holds her hand to her forehead in frustration because she cannot sleep at night due to too much light coming in her bedroom window
Fall asleep fast and sleep through the night by changing these 5 things in your bedroom
ChatGPT app on iPhone
I ditched to-do lists for ChatGPT Tasks — here's 5 ways it's changed everything
a photo of a woman with strong abs
Forget weights and sit-ups — this 10-minute standing ab workout will blast your core
Robot looking at a laptop/Future AI generated image
I test AI chatbots for a living — 7 common glitches and what to do when they happen
A Rollei 35AF film camera
I’ve seen the future of film photography — 3 next-gen gadgets I'm excited about