Shimano GRX FD-RX815-F Front Derailleur
What the checker says69will not fit3check before you buy
Run variant by variant through the gravel 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 870 verified gravel bike parts in this catalog. 789 produced no finding of any kind.
Will not fit
- Will not fiterror · Rear DerailleurDrivetrain mismatch: Front derailleur = shimano-grx-11, Rear derailleur = shimano-grx-12. Shifter, derailleurs and cassette must be one system. On 5 of the 20 verified rear derailleurs in this catalog.
- Will not fiterror · CassetteDrivetrain mismatch: Front derailleur = shimano-grx-11, Cassette = shimano-grx-12. Shifter, derailleurs and cassette must be one system. On 4 of the 18 verified cassettes in this catalog.
- Will not fiterror · Shifter/Brake LeversDrivetrain mismatch: Shifter = shimano-grx-12, Front derailleur = shimano-grx-11. Shifter, derailleurs and cassette must be one system. On 4 of the 17 verified shifter/brake levers in this catalog.
- Will not fiterror · CassetteDrivetrain mismatch: Front derailleur = shimano-grx-11, Cassette = campag-ekar-13. Shifter, derailleurs and cassette must be one system. On 3 of the 18 verified cassettes in this catalog.
- Will not fiterror · CassetteDrivetrain mismatch: Front derailleur = shimano-grx-11, Cassette = sram-xplr-12. Shifter, derailleurs and cassette must be one system. On 3 of the 18 verified cassettes in this catalog.
- Will not fiterror · Rear DerailleurDrivetrain mismatch: Front derailleur = shimano-grx-11, Rear derailleur = sram-xplr-13. Shifter, derailleurs and cassette must be one system. On 3 of the 20 verified rear derailleurs in this catalog.
Rg fd mount, Frame. 28 more findings from the same check, on up to 1 of the 74 verified frames each.
Rg actuation, Shifter/Brake Levers. 14 more findings from the same check, on up to 1 of the 17 verified shifter/brake levers each.
Rg drivetrain system, Shifter/Brake Levers. 6 more findings from the same check, on up to 2 of the 17 verified shifter/brake levers each.
Rg fd mount form, Frame. 6 more findings from the same check, on up to 1 of the 74 verified frames each.
Rg drivetrain system, Rear Derailleur. 5 more findings from the same check, on up to 2 of the 20 verified rear derailleurs each.
Rg drivetrain system, Cassette. 4 more findings from the same check, on up to 2 of the 18 verified cassettes each.
Open a variant in the builder to see the ones that apply to your own parts.
Check before you buy
- Check before you buywarning · CassetteFront derailleur Shimano GRX FD-RX815-F is rated for 11-speed rear drivetrains (the maker's own spec); this build's cassette is 12-speed. Check the maker's compatibility chart. On 8 of the 18 verified cassettes in this catalog.
- Check before you buywarning · CassetteFront derailleur Shimano GRX FD-RX815-F is rated for 11-speed rear drivetrains (the maker's own spec); this build's cassette is 13-speed. Check the maker's compatibility chart. On 4 of the 18 verified cassettes in this catalog.
- Check before you buywarning · CassetteFront derailleur Shimano GRX FD-RX815-F is rated for 11-speed rear drivetrains (the maker's own spec); this build's cassette is 10-speed. Check the maker's compatibility chart. On 3 of the 18 verified cassettes in this catalog.
$200.00 MSRP·135 g
What the maker states
- System
- Drivetrain system shimano-grx-11
- Speeds
- 11-speed (rear index count the maker rates it for)
- Actuation
- Di2-wired
- Mount
- Braze-on
- Capacity
- 17 teeth
- Speeds rated
- Rated for 11-speed
The rest of what the maker states1 not published
1 further field the checker looks for is not published by Shimano, so we leave it blank rather than estimate it, and that check stays silent on this front derailleur. It is clamp diameter. Each is recorded as “not stated by the maker (not checked)”.
Source: the maker’s page. Last checked 2026-08-15.
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 Exploro Race (Frame) No conflicts found
- 3T Fango LTD (Fork) No conflicts found
- 8bar Gravel Carbon Disc Fork v2 (Fork) No conflicts found
- 9point8 Fall Line R (Dropper Post) No conflicts found
- Acros ZS44/28.6 | EC44/40 Headset (Headset) No conflicts found
- All-City Cosmic Stallion LTD (Frame) Will not fit
6 of 509 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.