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TacxFlux 2 Smart Trainer


Item # TAC002P

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  • Black, One Size ($899.99)
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Item # TAC002P

Why We Like The Flux 2 Smart Trainer

As winter begins to wrap its icy fingers around your hemisphere, the brutally cold weather conditions and lack of daylight all contribute to a waning desire to ride outdoors. Riding the trainer inside isn't exactly on our list of favorite activities to do, partially because of the monotony of spinning in circles going nowhere, its unrealistic feel, and the insistent whining of rubber or roller. It is however often a necessary evil and it’s a hell of a lot easier than losing that hard-earned fitness and starting from scratch in the spring. Thankfully the newer crop of smart trainers does a wonderful job of simulating road-feel and direct-drives make them much quieter. One brand that's been making them for a while is Tacx and its Flux 2 Smart Trainer is an update on the original utilizing a heavier flywheel and stronger electromagnets to better simulate the load you would experience on a typical road ride. Boasting compatibility with many third-party apps and the ability to transmit via Bluetooth Smart as well as ANT+ FE-C, the Flux 2 can pair with virtually any smartphone, tablet or computer and transform your indoor riding experience this winter.

Of course, the Flux 2 will work with Tacx's own app, which comes with a free 1-month subscription, but the fun really begins when you tap into popular apps such as Zwift and TrainerRoad where it controls the resistance of the trainer and allows you to virtually race online. Two LEDs illuminate on the side to let you know when you're connected to your device, so there's no guessing whether or not you've successfully paired with the trainer before hopping on. The trainer is intuitive and fully programmable for your training plan du jour. Smart electronics work to increase resistance accurately when you make even the slightest adjustments to your power settings, so you know the resistance will increase or decrease as needed during your routine, and the information output is accurate to within an impressive +/- 2.5%. Firmware, testing, and calibration are easily updated on the Tacx app, so you can always keep things running smoothly and with the latest technology.

Boasting a heavy 7.6kg flywheel, the trainer is seriously smooth and uses 8 permanent ferrite magnets and 8 electromagnets to replicate road feel. Need a hard workout? The Flux 2 has a max power resistance of 2,000 watts at 40 km/h and can simulate a 16% grade. That's plenty for a thick World Tour sprinter or a sinewy grimpeur. You'll certainly want a stable base when practicing your sprints or out-of-the-saddle climbing and you'll enjoy the large footprint and quality materials that keep the Flux solid and prevents it from scooting across the floor.

You'll need to bring your own cassette to the party, and its compatible with 8 through 11 speed Shimano/SRAM cassettes with Campy freehubs sold separately. The trainer is compatible with standard 130mm road and 135mm mountain bike spacing with quick-releases and come with adaptors for thru-axle and boost spacing requirements.

Please note that some disc brake frames may have clearance issues on the Flux 2 Smart. A spacer is available directly through Tacx, if needed.

  • Compact and realistic direct drive trainer for indoor riding
  • 7.8kg flywheel for a realistic, smooth ride
  • Pairs via Bluetooth and ANT+ to a device
  • Compatible with 3rd party apps for virtual racing and data mining
  • Works with SRAM/Shimano 8-11-speed road cassettes
  • Electro brake provides resistance with electromagnets
  • Power accuracy is within +/- 2.5%
  • Simulates up to a 16% grade and has a max power of 2000 watts

Tech Specs
Resistance8 permanent ferrite magnets, 8 electromagnets
WirelessANT+ FE-C, Bluetooth
IncludesQuick-release for road bikes, mountain bikes, Direct drive quick-release with adapter set 142x12mm and 148x12mm, 1 month Tacx Premium software
Dimensions[open] 26.4 x 25.3in
Activityindoor cycling, training
Manufacturer Warranty2 year limited

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead


Actual weights are measured in-house by the Competitive Cyclist team.

Have questions? Chat with a Gearhead

What do you think about this product?



Which cassette works best? The one we have does not appear to work with this trainer. It is a SRAM

>Rating: 1

Nothing but headaches

I've used it several times

I regret buying this. It has been nothing but a headache. Constant connection problems. I've barely been able to complete a single training session without the bluetooth dropping. It will either not connect at all or drop the connection halfway through the ride. I'm quite tech savvy and have been through every troubleshooting scenario I could find. The ride videos on the app are nice, but what's the point when you can't finish a ride? Same problems regardless of device.


I have an older Specialized Roubaix, 10 cassette. I also have a long cage rear derailleur and big cassette due to the 22% hill around the corner from my house. Will I need to replace both?

>Rating: 5

Great value

I've put it through the wringer

I describe this as having the right balance between features and price. I've done 250 miles and have been very satisfied so far. I'm not a bike mechanic by any stretch and was able to get it set up in less than 15-minutes. It's quiet, easy to use, and has worked seamlessly with Zwift.

>Rating: 5

Better than expected

I have had a few Tacx trainers but never a direct drive. I wanted to make sure the Flux 2 was the current 2020 version. Competitive Cyclist has a cool text to ask questions option and was able to confirm it is the newest version. Once delivered (in two days) setup was easy and I was on my way.

>Rating: 5

It works for me

I've put it through the wringer

Seen some negative reviews on the web. Wasn’t sure what to expect. I think it’s pretty solid. Easy to set up, works fine for me on Zwift. I don’t really know what more to ask for? Maybe I’m easy. Maybe some people have crazy high expectations for smart trainers nowadays. I use it as a supplement go riding outside not as my primary means of riding. So for me it works great!

>Rating: 4

Solid Trainer, But Poor Training App

I've put it through the wringer

If you're looking for a manually controlled trainer, then the Tacx Flux 2 Smart Trainer works perfectly. It's super quiet and has a wide resistance range. It was very easy to setup. And, it was even compatible out-of-the-box with my 27.5 inch Boost mountain bike frame. Now the bad news...the Tacx app is horrible. If you think you're going to connect the app to the trainer and then quickly run their training videos, then you're sadly mistaken. Even after using the app daily for three weeks, I was still struggling to get it all working correctly. Some days, the connection to the trainer wouldn't work. Other days, the connection would drop out during the training session. When it did run smoothly (75% of the time), the videos on the app would control the resistance oddly. On long, constant pitch climbs in the Alps, the resistance would suddenly change dramatically harder or easier like the rider who created the video shifted gears. It was so bad across all videos that I had to modify the settings of the app to reduce the power by 50%! Even on flat rides, there would be this "gear changes". I'm surprised that Tacx (owned by Garmin) wouldn't have removed these dramatic power changes from the videos -- it can't be that difficult to identify the large spikes and level them out. In addition, there are very few videos that are oriented to mountain bikers. Maybe only a half dozen. Certainly no singletrack, but there are a few gravel path rides. Most of the videos are paved road rides. So, after a month of using the trainer daily, I've now stopped using the Flux app completely and just control resistance from my Garmin GPS while watching YouTube mountain biking videos. So much less hassle and the trainer works perfectly while staying connected.

Absolutely no one uses the Tacx app. You've discovered why. Even Tacx knows this. Maybe Garmin will fix, but don't count on it as Garmin truly can't do software. Everyone uses one or more of Zwift, Fulgaz, TrainerRoad, or Sufferfest. Read DC Rainmaker for more info than any normal person could possibly want. Even Zwift is reasonable about subscriptions. You can join month by month; "pause" for the better weather and stop paying; and they keep your info around without billing you. You go off pause and start paying again and you are right where you left off at the end of the previous winter.


do i need to buy cossete ?

Hi Igor, excellent question - the trainer does NOT come with a cassette. If you reach out to a gearhead directly we can add the cassette and even have the shop install it prior to shipping at no charge.


Used witch Campagnolo ?

Hi Miguel - excellent question. If you wish to use a Campagnolo cassette you can add a Campgnolo freehub body item Item # TAC002T. If you contact us we can have the shop install this for you along with a cassette to suit your needs.