Question 1

What is the Shimano Micro Spline freehub body?

Accepted Answer

Shimano’s 12-speed MTB driver (XTR/XT/SLX/Deore), 10 t smallest cog. Trainer-side bodies have historically been scarce — check availability. It accepts 12-speed cassettes with a smallest cog of 10 teeth.

Question 2

Which smart trainers have a Shimano Micro Spline freehub?

Accepted Answer

5 trainers offer a Shimano Micro Spline body: Elite Suito-T, Elite Direto XR, Elite Justo 2, Elite Avanti, Elite Justo. It is sold separately on all of them.

Question 3

Is the Shimano Micro Spline body included or sold separately?

Accepted Answer

On every trainer in our database the Shimano Micro Spline body is a separately-bought accessory, not included in the box.

Question 4

What cassettes fit a Shimano Micro Spline body?

Accepted Answer

Shimano Micro Spline accepts 12-speed cassettes (min 10T). Shimano cassettes are the native match; check cross-brand compatibility before buying.

Question 5

Can I convert a trainer to Shimano Micro Spline?

Accepted Answer

Yes on the trainers listed above — you unscrew the existing freehub body and fit the Shimano Micro Spline one (a cassette tool and a few minutes). On trainers that don’t list a Shimano Micro Spline body, conversion isn’t supported.

Shimano Micro Spline

Trainers offering this freehub

Frequently asked questions