| Manufacturer | Garmin (Tacx) |
| Type | Direct-drive smart trainer |
| Series | Tacx FLUX |
| Status | Listed by Garmin under Previous Models and still on sale |
| Price | £399.99 at Garmin UK |
| Predecessor | – |
| Successor | – |
| Part number | T2900S.62 (cassette not included) |
| Weight | 22.8kg |
Specifications and features as listed by Garmin.
Summary | Versus Tacx FLUX 2 | Specifications | Features | Quick answers | Further reading
Summary
Tacx FLUX S is the lowest-priced direct-drive smart trainer in the Tacx range, at £399.99 at Garmin UK. It handles sprints up to 1,500W, simulates climbs up to 10% and measures power to within 3%. It uses a 7kg flywheel and needs a spin down for calibration. It works with ANT+ and Bluetooth apps and Garmin bike computers. A cassette is not included.
Versus Tacx FLUX 2
- Handles sprints up to 1,500W; the FLUX 2 handles 2,000W
- Simulates climbs up to 10%; the FLUX 2 simulates 16%
- Measures power to within 3%; the FLUX 2 measures to within 2.5%
- Peak torque is 22.1Nm and maximum brake force is 65N; the FLUX 2 reaches 41Nm and 120N
- Uses a 7kg flywheel and weighs 22.8kg; the FLUX 2 uses a 7.6kg flywheel and weighs 23.6kg
- Costs £399.99 against £629.99 for the FLUX 2
Specifications
| Performance | |
|---|---|
| Maximum power | 1,500W |
| Maximum simulated grade | 10% |
| Power accuracy | Within 3% |
| Calibration | Spin down |
| Maximum torque | 22.1Nm |
| Maximum brake force | 65N |
| Flywheel | 7kg / 15.4lb |
| Mass inertia | 22.8kg / 50.3lb |
| Magnets | 8 permanent ferrite magnets and 8 electromagnets |
| Measured | Speed, cadence, power |
| Physical | |
| Dimensions | 670 x 642mm / 26.4 x 25.3in |
| Height | 460mm / 18.1in |
| Weight | 22.8kg / 50.3lb |
| Electrical requirement | 110-240V |
| Bike compatibility | |
| Cassette | Not included |
| Suitable cassettes | Shimano/SRAM 9 to 11 speed. Campagnolo. SRAM XD and XDR body (sold separately). Shimano 12-speed Hyperglide+. Not suitable for the Specialized SCS system. |
| Suitable axles | Quick release 130mm/135mm x 5mm. Thru-axle end caps 142mm/148mm x 12mm. A 135mm thru-axle adapter set is available separately for bike dimensions outside the industry standard. |
| Connectivity and compatibility | |
| Wireless | ANT+, Bluetooth |
| Control by | Smartphone, tablet, ANT+ bike computers, stand alone, computer via ANT+ antenna |
| Read out on | Smartphone, tablet, bike computer, computer with ANT+ antenna |
| © the5krunner. Link required. | |
Features
Ride feel and performance
- A 7kg flywheel and 22.8kg of mass inertia give a steady ride feel
- Sprints up to 1,500W are supported
- Climbs up to 10% are simulated
Accuracy and setup
- Power, speed and cadence are measured to within 3%, with a spin down for calibration
- It fits quick release bikes (130mm and 135mm) and thru-axle bikes (142mm and 148mm x 12mm)
- It connects over ANT+ and Bluetooth, and a smartphone, tablet, ANT+ bike computer or computer with an ANT+ antenna can control it
Quick answers
How much does the Garmin Tacx FLUX S cost?
Tacx FLUX S costs GBP 399.99 at Garmin UK, making it the lowest-priced direct-drive smart trainer in the Tacx range. Garmin lists it under Previous Models, but it is still on sale.
What is the Tacx FLUX S maximum power and gradient?
Tacx FLUX S handles sprints up to 1,500W and simulates climbs up to 10%.
How accurate is the Tacx FLUX S?
Tacx FLUX S measures power, speed and cadence to within 3%. It needs a spin down for calibration.
Does the Tacx FLUX S fit thru-axle bikes?
Yes, Tacx FLUX S fits thru-axle bikes with 142mm and 148mm x 12mm axles, as well as 130mm and 135mm quick release bikes.
Does the Tacx FLUX S come with a cassette?
No, a cassette is not included with Tacx FLUX S. It takes Shimano/SRAM 9 to 11 speed, Campagnolo and Shimano 12-speed Hyperglide+ cassettes, and SRAM XD and XDR bodies are sold separately.
How much does the Tacx FLUX S weigh?
Tacx FLUX S weighs 22.8kg and measures 670 x 642mm with a height of 460mm. It uses a 7kg flywheel.
Further reading
Related trainers
- Tacx FLUX 2, with 2,000W sprints and 16% climbs
- Tacx NEO 2T, with 1% accuracy and no calibration
Small things I always use
- Garmin 90-degree charging adapter: Charges your Garmin from any USB-C cable. Essential when travelling. I use one.
- Body Glide: The blue anti-chafe stick swimmers and runners carry. I use it.
- Speedo earplugs: Fewer ear infections and no cold-water dizziness. I use them.
- Dryrobe Advance: My winter changing robe for open-water swims. I use one. A cheaper option is the AONYIYI changing robe.
- Maurten: Race fuel that stays easy on the stomach. I use them.
- Beet It Sport nitrate shots: Beetroot shots I take in the days before a race. I use them.
- Garmin charging puck: The quickest way to top up before a session. I use one.
- Injinji: Toe socks that stop rubbing, so you run more. I use them.
- Ultimate toe protectors: Stop black toenails on long runs. They work. I use them.
- Compressport R2 v2 calf sleeves: My calf sleeves of choice. I use them.
- Cellucor C4: My pre-workout before hard sessions.
- TPU tubes: Schwalbe Aerothan, Tubolito and Pirelli SmarTube. Light, tiny spares. I use all three.
- G8 insoles: Adjustable insoles that are good. I use them.
- Cycplus Cube: A 97g electric pump that gets a road tyre rideable in two minutes. I carry one. 5% off with code THE5KRUNNER.
Watches and sensors
- Polar H10: My daily driver for waking HRV.
- Polar Verity Sense: My backup arm-worn HR sensor.
- Nomad bedside charger: Charges my iPhone and Apple Watch overnight. I use it, and many of their bands.
- Train.Red: The best muscle oxygen sensor I’ve used.
- Tymewear: Accurate heart rate and reliable ventilatory zones. I use it to pace endurance rides over an hour.
- Garmin Forerunner 970: A pro-grade triathlon watch. I use this.
- Apple Watch Ultra 4: My daily smartwatch. No phone needed on rides.
- Garmin Fenix 9 Pro: I’ve just bought one.
On the bike
- Continental GP5000 for everyday riding, and Aero 111 on the front for special occasions.
- Helmets: Specialized S-Works Evade 3 for road riding, and Rudy Project Wing for TT-style races. I use both.
- Ravemen FR300: A front light that mounts under your Garmin or Wahoo. I use one.
- Wahoo TRACKR Radar: I use it on one bike and Varia on the other. They perform the same.
- Garmin Varia RTL515: Radar that warns you of cars from behind. I use this model.
- Wahoo ELEMNT Roam 3: The bike computer that’s easy to use. I use mine on most rides.
- Favero Assioma Pro RS2: Accurate power pedals that swap easily between bikes. I use this model.
Home and indoor training
- NPE Runn: Makes my basic treadmill smart, sending more accurate speed and distance to my watch and Zwift. I use it.
- Google Wifi: Keeps Zwift connected in my pain cave. I use it.
- Apple TV 4K: Zwift on the big screen. I use two.
- Google Nest Doorbell (wired, 2nd gen): My video doorbell, running in both Google Home and Apple Home. I use it.
Health, recovery and sleep
- FreeStyle Libre 3 Plus: Shows how my blood sugar responds to diet.
- hDrop: Measures my sweat loss in summer and indoors.
- Fourth Frontier Zone: Checks my heart under load in hard sessions.
- Oura Ring 5: My partner’s recovery tracker of choice.
- Eight Sleep: A cooling mattress cover my partner and I use nightly.
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