Smart Trainer Compatibility Report 2026
Data last updated: 2026-08-24
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.
Smart trainer statistics 2026 — quotable numbers
Each figure is computed live from the FitMyTrainer dataset (33 trainers, 10 brands, 2026). Cite freely with a link.
- 73% of the 30 direct-drive smart trainers tracked in 2026 (22 models) ship without a cassette.
- 93% of direct-drive trainers include thru-axle adapters in the box.
- 27 of 33 tracked trainers support Boost 12x148 rear axles.
- 32 of 33 tracked trainers support the road-standard 12x142 thru-axle.
- 33 of 33 tracked trainers still accept quick-release frames.
- Shimano/SRAM HG (HyperGlide) is the most supported freehub body, fitting 28 of 33 trainers.
- The average maximum resistance among direct-drive trainers is 2008 W; the highest tracked is 2800 W.
- 19 of 33 tracked trainers are current models; 14 are discontinued but common on the used market.
- 16 tracked trainers need no cassette at all (single-sprocket, Zwift Cog style).
- 3 of 33 tracked trainers are wheel-on designs.
- 10 brands compete in the 2026 smart-trainer market we track.
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.