Smart Trainer Compatibility Report 2026
Data last updated: 2026-08-01
We aggregated axle, freehub and cassette compatibility across 33 smart trainers from 10 brands. Here is what the data says about what actually fits — and what you still have to buy.
Across 33 smart trainers, 22 of the direct-drive models (73%) ship without a cassette — so for most trainers you buy one matching your bike. Thru-axle adapters are included on 93% of direct-drive trainers, and Shimano/SRAM HG is the default freehub on nearly all of them; SRAM XD/XDR, Shimano Micro Spline and Campagnolo are aftermarket swaps.
The dataset at a glance
Key findings
- 1
22 of 33 trainers (73% of direct-drive) ship bare — you add a cassette matching your bike’s drivetrain speed.
- 2
Thru-axle adapters are included in the box on 93% of direct-drive trainers, so most modern road and gravel bikes mount with no extra purchase.
- 3
27 of 33 trainers support 12×148 mm Boost thru-axle — MTB compatibility is now near-universal on current direct-drive models.
- 4
Shimano/SRAM HG (HyperGlide) is the most widely supported aftermarket freehub body (28 trainers) — relevant if you run a SRAM or 12-speed drivetrain.
Freehub body support across the market
How many of the 33 trainers can run each freehub body (with the matching driver).
Methodology
Figures are computed live from the FitMyTrainer database — 33 trainers across 10 brands, each field verified against manufacturer specs and reputable reviews (sources are listed on every trainer page). We never include hands-on claims or unverified figures; unknown values are excluded, not guessed.