Shimano Ultegra Front Derailleur
What the checker says81will not fit
Run variant by variant through the road 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 1038 verified road bike parts in this catalog. 951 produced no finding of any kind; that is Ultegra FD-R8150 Di2. Ultegra FD-R8100 (mechanical) clears 948. Each variant produces 48 to 59 distinct errors and 0 distinct warnings.
Will not fit
- Will not fiterror · CassetteDrivetrain mismatch: Front derailleur = shimano-road-12, Cassette = sram-axs-road. Shifter, derailleurs and cassette must be one system. On 10 of the 34 verified cassettes in this catalog. Applies to all 2 variants.
- Will not fiterror · Shifter/Brake LeversDrivetrain mismatch: Shifter = shimano-road-11, Front derailleur = shimano-road-12. Shifter, derailleurs and cassette must be one system. On 6 of the 25 verified shifter/brake levers in this catalog. Applies to all 2 variants.
- Will not fiterror · CassetteDrivetrain mismatch: Front derailleur = shimano-road-12, Cassette = shimano-road-11. Shifter, derailleurs and cassette must be one system. On 5 of the 34 verified cassettes in this catalog. Applies to all 2 variants.
- Will not fiterror · Rear DerailleurDrivetrain mismatch: Front derailleur = shimano-road-12, Rear derailleur = shimano-grx-12. Shifter, derailleurs and cassette must be one system. On 5 of the 29 verified rear derailleurs in this catalog. Applies to all 2 variants.
- Will not fiterror · Rear DerailleurDrivetrain mismatch: Front derailleur = shimano-road-12, Rear derailleur = shimano-road-11. Shifter, derailleurs and cassette must be one system. On 4 of the 29 verified rear derailleurs in this catalog. Applies to all 2 variants.
- Will not fiterror · Rear DerailleurDrivetrain mismatch: Front derailleur = shimano-road-12, Rear derailleur = sram-axs-road. Shifter, derailleurs and cassette must be one system. On 4 of the 29 verified rear derailleurs in this catalog. Applies to all 2 variants.
- Will not fiterror · Shifter/Brake LeversDrivetrain mismatch: Shifter = shimano-grx-12, Front derailleur = shimano-road-12. Shifter, derailleurs and cassette must be one system. On 4 of the 25 verified shifter/brake levers in this catalog. Applies to all 2 variants.
Rg actuation, Shifter/Brake Levers. 29 more findings from the same check, on up to 1 of the 25 verified shifter/brake levers each.
Rg fd mount form, Frame. 24 more findings from the same check, on up to 1 of the 59 verified frames each.
Rg drivetrain system, Cassette. 7 more findings from the same check, on up to 3 of the 34 verified cassettes each.
Rg drivetrain system, Rear Derailleur. 6 more findings from the same check, on up to 3 of the 29 verified rear derailleurs each.
Rg drivetrain system, Shifter/Brake Levers. 6 more findings from the same check, on up to 3 of the 25 verified shifter/brake levers each.
Rg fd mount, Frame. 2 more findings from the same check, on up to 1 of the 59 verified frames each.
Open a variant in the builder to see the ones that apply to your own parts.
$100.00 to $150.00 MSRP·95 to 108 g
What the maker states
- System
- Drivetrain system shimano-road-12
- Speeds
- 12-speed (rear index count the maker rates it for)
- Actuation
- Di2-wired (on 1 of 2 variants); Mechanical (on 1 of 2 variants)
- Mount
- Braze-on
A value shown as a set or a range differs between this model’s variants and is never one variant’s spec.
2 verified variants
| Variant | Actuation | Price (MSRP) | Weight | Source | Last checked | Build |
|---|---|---|---|---|---|---|
| Ultegra FD-R8100 (mechanical) | mechanical | $100.00 | 95 g | maker’s page | 2026-07-18 | Build with this |
| Ultegra FD-R8150 Di2 | di2-wired | $150.00 | 108 g | maker’s page | 2026-07-18 | Build with this |
The rest of what the maker states3 not published
3 further fields the checker looks for are not published by Shimano, so we leave them blank rather than estimate them, and those 3 checks stay silent on this front derailleur. They are speeds rated, capacity and maximum chainring diff. 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 2026-07-18.
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.
- 3T Aeroflux Integrale (Handlebar) No conflicts found
- 3T Apto Stealth Stem (Stem) No conflicts found
- 3T Superergo LTD (standard, non-INTEGRALE) (Handlebar) No conflicts found
- All-City Zig Zag Frameset (Frame) Will not fit
- Argon 18 SUM D-Shape Seatpost (Seatpost) No conflicts found
- Argon 18 Sum Frameset (Frame) No conflicts found
6 of 703 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.