Tacx / Garmin Assembly Kit FLUX S/2 – Type 2 (12mm Axle)
What Is It?
The Tacx Assembly Kit FLUX S/2 (Type 2, 12mm axle) is a thru-axle adapter and mounting kit used with Tacx FLUX S and FLUX 2 smart trainers. It allows bicycles with a 12mm thru-axle rear hub to be correctly mounted and aligned on a direct-drive indoor trainer.
It is essentially a fitment conversion kit that ensures your bike’s rear axle standard matches the trainer interface for safe and stable indoor riding.
Key Features
- Converts trainer compatibility for 12mm thru-axle bikes
- Designed specifically for FLUX S and FLUX 2 smart trainers
- Includes multiple adapters for different frame standards (e.g., 142mm / 148mm Boost setups depending on kit version)
- Ensures stable, secure rear-wheel dropout alignment
- Enables quick installation and removal of the bike on the trainer
- Works with both road and MTB frames using thru-axle systems
Specifications
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Product Type: Trainer axle adapter / assembly kit
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Compatible Trainers: Tacx FLUX S, Tacx FLUX 2
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Axle Standard: 12mm thru-axle (Type 2 configuration)
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Frame Compatibility: Typically 142x12mm and 148x12mm Boost (kit dependent)
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Material: Metal + composite adapter components
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Function: Converts axle interface for direct-drive trainer mounting
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Installation: Tool-assisted (usually includes hex key and spacers depending on kit version)
Who Is It Suitable For?
- Cyclists using Tacx FLUX S or FLUX 2 smart trainers
- Riders with modern bikes using 12mm thru-axle systems
- MTB and gravel riders with Boost spacing setups
- Road cyclists training indoors on direct-drive trainers
Who Should Use It?
- Anyone whose bike does not fit the trainer out of the box
- Riders switching between quick-release and thru-axle bikes
- Indoor training users needing a secure, wobble-free trainer setup
- Athletes using structured indoor training programs
Riding Characteristics (Indoor Training Experience)
- Provides a very stable and solid bike-to-trainer connection
- Eliminates play or misalignment during hard efforts (sprints / intervals)
- Supports high-power training sessions without flex issues
- Smooth pedalling feel when correctly installed
- Essential for accurate power transfer and realistic indoor ride feel
