# HG 8-11 speed mountain freehub — Bike drivetrain and groupset compatibility

For HG 8-11 speed mountain freehub, manufacturer is Shimano; component type is freehub; speeds is 11; pairs with is 11 speed mountain cassettes; condition is without the use of a spacer, recorded from its source on 2026-08-11.

- **Manufacturer:** Shimano _(our reading, not quoted from the source)_
- **Component:** HG 8-11 speed mountain freehub
- **Component type:** freehub _(our reading, not quoted from the source)_
- **Speeds:** 11 _(our reading, not quoted from the source)_
- **Pairs with:** 11 speed mountain cassettes _(verified: appears in the quote below)_
- **Condition:** without the use of a spacer _(verified: appears in the quote below)_

## What the source says

> When 11 speed mountain cassettes came out, they would fit on the 8-10 speed freehubs without the use of a spacer.

## Sources disagree

More than one authority states this, and they do not state the same
thing. Both are reproduced with the source each came from.

### Speeds

lightbicycle.com says speeds is **11**, as of 2026-08-11.

> When 11 speed mountain cassettes came out, they would fit on the 8-10 speed freehubs without the use of a spacer.

Source: https://www.lightbicycle.com/newsletter/Bike-Freehub-Cassette-Compatibility-Manual.html

lightbicycle.com says speeds is **10**, as of 2026-08-11.

> A Shimano 10 speed cassette is even narrower than a 9 speed so you need to run a 1mm spacer behind the cassette in this case.

Source: https://www.lightbicycle.com/newsletter/Bike-Freehub-Cassette-Compatibility-Manual.html

lightbicycle.com says speeds is **11**, as of 2026-08-11.

> Road 11 speed, however, would not fit unless you were to remove one of the inner cogs.

Source: https://www.lightbicycle.com/newsletter/Bike-Freehub-Cassette-Compatibility-Manual.html


### Pairs with

lightbicycle.com says pairs with is **11 speed mountain cassettes**, as of 2026-08-11.

> When 11 speed mountain cassettes came out, they would fit on the 8-10 speed freehubs without the use of a spacer.

Source: https://www.lightbicycle.com/newsletter/Bike-Freehub-Cassette-Compatibility-Manual.html

lightbicycle.com says pairs with is **Shimano 10 speed cassette**, as of 2026-08-11.

> A Shimano 10 speed cassette is even narrower than a 9 speed so you need to run a 1mm spacer behind the cassette in this case.

Source: https://www.lightbicycle.com/newsletter/Bike-Freehub-Cassette-Compatibility-Manual.html

lightbicycle.com says pairs with is **Road 11 speed**, as of 2026-08-11.

> Road 11 speed, however, would not fit unless you were to remove one of the inner cogs.

Source: https://www.lightbicycle.com/newsletter/Bike-Freehub-Cassette-Compatibility-Manual.html


### Condition

lightbicycle.com says condition is **without the use of a spacer**, as of 2026-08-11.

> When 11 speed mountain cassettes came out, they would fit on the 8-10 speed freehubs without the use of a spacer.

Source: https://www.lightbicycle.com/newsletter/Bike-Freehub-Cassette-Compatibility-Manual.html

lightbicycle.com says condition is **1mm spacer**, as of 2026-08-11.

> A Shimano 10 speed cassette is even narrower than a 9 speed so you need to run a 1mm spacer behind the cassette in this case.

Source: https://www.lightbicycle.com/newsletter/Bike-Freehub-Cassette-Compatibility-Manual.html

lightbicycle.com says condition is **would not fit unless you were to remove one of the inner cogs**, as of 2026-08-11.

> Road 11 speed, however, would not fit unless you were to remove one of the inner cogs.

Source: https://www.lightbicycle.com/newsletter/Bike-Freehub-Cassette-Compatibility-Manual.html


## Source

- https://www.lightbicycle.com/newsletter/Bike-Freehub-Cassette-Compatibility-Manual.html

Last verified: 2026-08-11. Review by: 2027-08-11.
Part of [Bike drivetrain and groupset compatibility](https://referencesource.org/bike-drivetrain-groupset-compatibility/).