Box Box Cassette
What the checker says65will not fit
Run variant by variant through the e-MTB builder’s own engine. Every sentence below is the checker’s, unedited. Nothing here says this part fits your bike; it says what it does and does not fit among the parts we hold.
Checked against 458 verified e-MTB parts in this catalog. 301 produced no finding of any kind. Each variant produces 63 distinct errors and 0 distinct warnings.
Will not fit
- Will not fiterror · Rear DerailleurSpeed mismatch: Derailleur 12s, Cassette 9s. Shifter, derailleur and cassette must be the same speed count. On 39 of the 74 verified rear derailleurs in this catalog. Applies to all 2 variants.
- Will not fiterror · ShifterSpeed mismatch: Shifter 12s, Cassette 9s. Shifter, derailleur and cassette must be the same speed count. On 28 of the 53 verified shifters in this catalog. Applies to all 2 variants.
- Will not fiterror · Rear WheelFreehub mismatch: Box Box Three Prime 9 11-50 needs a HG freehub, but Rear wheel has XD. On 23 of the 47 verified rear wheels in this catalog. Applies to 1 of 2 variants.
- Will not fiterror · Rear WheelFreehub mismatch: Box Box Two Prime 9 X-Wide 11-50 needs a HG freehub, but Rear wheel has XD. On 23 of the 47 verified rear wheels in this catalog. Applies to 1 of 2 variants.
- Will not fiterror · Rear DerailleurDrivetrain mismatch: Derailleur = shimano-linkglide, Cassette = box-prime-9. Shifter, derailleur and cassette must be one system. On 21 of the 74 verified rear derailleurs in this catalog. Applies to all 2 variants.
- Will not fiterror · Rear DerailleurDrivetrain mismatch: Derailleur = shimano-12, Cassette = box-prime-9. Shifter, derailleur and cassette must be one system. On 19 of the 74 verified rear derailleurs in this catalog. Applies to all 2 variants.
- Will not fiterror · ShifterDrivetrain mismatch: Shifter = shimano-12, Cassette = box-prime-9. Shifter, derailleur and cassette must be one system. On 19 of the 53 verified shifters in this catalog. Applies to all 2 variants.
- Will not fiterror · Rear DerailleurSpeed mismatch: Derailleur 11s, Cassette 9s. Shifter, derailleur and cassette must be the same speed count. On 15 of the 74 verified rear derailleurs in this catalog. Applies to all 2 variants.
Emtb cassette capacity, Rear Derailleur. 27 more findings from the same check, on up to 1 of the 74 verified rear derailleurs each.
Emtb drivetrain system, Shifter. 11 more findings from the same check, on up to 11 of the 53 verified shifters each.
Emtb drivetrain system, Rear Derailleur. 10 more findings from the same check, on up to 12 of the 74 verified rear derailleurs each.
Emtb drivetrain speeds, Shifter. 4 more findings from the same check, on up to 10 of the 53 verified shifters each.
Emtb drivetrain speeds, Rear Derailleur. 3 more findings from the same check, on up to 10 of the 74 verified rear derailleurs each.
Emtb freehub, Rear Wheel. 2 more findings from the same check, on up to 13 of the 47 verified rear wheels each.
Open a variant in the builder to see the ones that apply to your own parts.
$76.99 to $109.99 MSRP·660 g
What the maker states
- Speeds
- 9-speed (rear index count the maker rates it for)
- System
- Drivetrain system Box Prime 9 (9-speed)
- Freehub
- / driver Shimano HG
- Minimum cog
- Smallest cog 11 teeth
- Maximum cog
- Largest cog 50 teeth
2 verified variants
| Variant | Price (MSRP) | Weight | Source | Last checked | Build |
|---|---|---|---|---|---|
| Box Three Prime 9 11-50 (2019) | $76.99 | 660 g | maker’s page | 2026-07-14 | Build with this |
| Box Two Prime 9 X-Wide 11-50 | $109.99 | not stated | maker’s page | 2026-07-31 | Build with this |
The rest of what the maker states1 not published
1 further field the checker looks for is not published by Box, so we leave it blank rather than estimate it, and that check stays silent on this cassette. It is e approved. Each is recorded as “not stated by the maker (not checked)”.
Source: each variant links the maker’s own page in the table above. Last checked 2026-07-14 to 2026-07-31.
Checked against
The checker ran this model against every verified part below that it has a slot for, the same way it checks a build in the builder. What follows is the verdict it actually produced for that specific pairing — not a recommendation, and not a guarantee any of these parts fits your own bike.
- 9point8 Fall Line 30.9 / 125mm (INLINE) (Dropper Post) No conflicts found
- BikeYoke Divine 2.0 Dropper Post 31.6 / 125mm (Dropper Post) No conflicts found
- BikeYoke Divine SL Dropper Post 30.9 / 80mm (Dropper Post) No conflicts found
- BikeYoke Divine SL Rascal Dropper Post 30.9 / 80mm (Dropper Post) No conflicts found
- BikeYoke Revive 3.0 Dropper Post 30.9 / 125mm (Dropper Post) No conflicts found
- BikeYoke Revive Max 3.0 (34.9) Silver Ltd. Dropper Post 34.9 / 125mm (Dropper Post) No conflicts found
6 of 245 counterparts with a page of their own that the checker actually probed this model against, in alphabetical order by brand and model — never by price, popularity or the verdict itself.