Hayes Dominion Front Brake
What the checker says5will not fit
Run variant by variant through the mountain bike 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 6082 verified mountain bike parts in this catalog. 6076 produced no finding of any kind. Each variant produces 2 distinct errors and 0 distinct warnings.
Will not fit
- Will not fiterror · Front RotorFront rotor too big for the caliper as recorded here: 223mm is larger than 220mm, the largest rotor size this catalog records for the Hayes Dominion A2 caliper. The caliper maker's own rotor chart is the place to check. On 5 of the 177 verified rotors in this catalog. Applies to 1 of 4 variants.
- Will not fiterror · Front RotorFront rotor too big for the caliper as recorded here: 223mm is larger than 220mm, the largest rotor size this catalog records for the Hayes Dominion A4 caliper. The caliper maker's own rotor chart is the place to check. On 5 of the 177 verified rotors in this catalog. Applies to 1 of 4 variants.
- Will not fiterror · Front RotorFront rotor too big for the caliper as recorded here: 223mm is larger than 220mm, the largest rotor size this catalog records for the Hayes Dominion T2 caliper. The caliper maker's own rotor chart is the place to check. On 5 of the 177 verified rotors in this catalog. Applies to 1 of 4 variants.
- Will not fiterror · Front RotorFront rotor too big for the caliper as recorded here: 223mm is larger than 220mm, the largest rotor size this catalog records for the Hayes Dominion T4 caliper. The caliper maker's own rotor chart is the place to check. On 5 of the 177 verified rotors in this catalog. Applies to 1 of 4 variants.
- Will not fiterror · ShifterShifter mount: Shimano Saint SL-M820-B-I (I-SPEC B) is a I-Spec B lever-integrated shifter (no bar clamp of its own), and the brake levers take I-Spec EV / I-Spec II / MatchMaker X, so it does not bolt to them. The band-clamp version of the shifter, or a ShiftMount-style adapter, is what bridges that. A shim or adapter may make other sizes or standards work, but that is a modification, not a fit. On 1 of the 53 verified shifters in this catalog. Applies to all 4 variants.
$250.00 to $349.99 MSRP·254 to 310 g
What the maker states
- Mount
- Post mount caliper
- Pistons
- 2-piston caliper (on 2 of 4 variants); 4-piston caliper (on 2 of 4 variants)
- Maximum rotor
- Rotor up to 220 mm
- Lever accepts
- I-Spec EV, I-Spec II and MatchMaker X
A value shown as a set or a range differs between this model’s variants and is never one variant’s spec.
4 verified variants
| Variant | Pistons | Price (MSRP) | Weight | Source | Last checked | Build |
|---|---|---|---|---|---|---|
| Dominion A4 | 4-piston caliper | $250.00 | 310 g | maker’s page | 2026-07-16 | Build with this |
| Dominion A2 | 2-piston caliper | $250.00 | 303 g | maker’s page | 2026-07-16 | Build with this |
| Dominion T4 | 4-piston caliper | $349.99 | 257 g | maker’s page | 2026-08-04 | Build with this |
| Dominion T2 | 2-piston caliper | $324.99 | 254 g | maker’s page | 2026-08-04 | Build with this |
The rest of what the maker states4 not published
4 further fields the checker looks for are not published by Hayes, so we leave them blank rather than estimate them, and those 4 checks stay silent on this front brake. They are excludes rotor, maximum rotor evidence, design rotor thickness and design rotor thickness maximum. 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 2026-07-16 to 2026-08-04.
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.
- 5DEV R-SPEC Trail/Enduro Cranks (Crankset) No conflicts found
- 9point8 Fall Line (Dropper Post) No conflicts found
- 9point8 Stout (31.8, 30mm) (Stem) No conflicts found
- ACID SLX 30 front (Front Wheel) No conflicts found
- ACID SLX 30 rear (Rear Wheel) No conflicts found
- Acros ZS44/ZS56 (Headset) No conflicts found
6 of 1862 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.