Thru-axle & quick-release adapter finder
Quick answer
Match the adapter to your bike’s rear dropout. Quick-release frames (130/135 mm) clamp in the trainer’s standard cups — no extra adapter. Thru-axle frames (12×142 or 12×148 Boost) need end-cap adapters that fit the trainer; 20 of 30 direct-drive trainers in our database ship those adapters in the box, the rest sell them separately.
Your dropout → what you need
Identify your frame’s rear axle, then fit the matching trainer adapter:
| Rear dropout | Adapter you need |
|---|---|
| 130 mm quick-release | Standard quick-release cups (no extra adapter on most trainers) |
| 135 mm quick-release | Standard quick-release cups (no extra adapter on most trainers) |
| 12 × 142 mm thru-axle | Thru-axle end-cap adapter sized for your axle (often included) |
| 12 × 148 mm Boost thru-axle | Thru-axle end-cap adapter sized for your axle (often included) |
| 12 × 135 mm thru-axle | Thru-axle end-cap adapter sized for your axle (often included) |
| 10 × 135 mm thru-axle | Thru-axle end-cap adapter sized for your axle (often included) |
Trainers where an adapter is a separate purchase
8 of the 30 direct-drive trainers in our database accept a standard whose adapter is not in the box. This is the column nobody publishes: the 12 × 142 mm adapter ships and the wider 12 × 148 mm Boost one is bought.
| Trainer | Adapter you have to buy |
|---|---|
| Tacx Flux S Smart | 12 × 142 mm, 12 × 148 mm Boost |
| Elite Suito-T | 12 × 148 mm Boost |
| Elite Direto XR | 12 × 148 mm Boost, 12 × 135 mm, 10 × 135 mm |
| Tacx NEO 2T | 12 × 135 mm, 10 × 135 mm |
| Magene T300 | 12 × 142 mm, 12 × 148 mm Boost |
| Elite Justo | 12 × 148 mm Boost, 12 × 135 mm |
| JetBlack WhisperDrive Smart | 12 × 148 mm Boost |
| Elite Rivo | 12 × 148 mm Boost, 12 × 135 mm, 10 × 135 mm |
Frequently asked questions
It depends on your dropout. Quick-release bikes usually need no extra adapter — they clamp in the trainer’s standard cups. Thru-axle bikes need end-cap adapters matching their axle; 20 of 30 direct-drive trainers in our database include them.
Most do: 20 of 30 direct-drive trainers in our database ship thru-axle adapters in the box (typically 12×142 and 12×148 Boost). A few sell them as an extra — check each trainer’s page.
Quick-release frames (130 mm road or 135 mm MTB/disc) mount with the trainer’s standard QR cups, so no extra adapter is normally required. You will, however, usually need a cassette and the right freehub body.
Boost (12 × 148 mm) is the wide MTB thru-axle standard. 28 trainers in our database accept it and 20 of them ship the adapter in the box. The rest sell it separately: Tacx Flux S Smart, Elite Suito-T, Elite Direto XR, Elite Tuo, Magene T300, Elite Justo, JetBlack WhisperDrive Smart, Elite Rivo.
Buy the manufacturer’s thru-axle adapter kit for your axle size. The trainer’s page lists whether the adapter ships in the box or is a separate purchase, so you know before you buy.