Shimano GRX RX820 Shifter/Brake Levers
What the checker says63will not fit
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 864 verified gravel bike parts in this catalog. 800 produced no finding of any kind.
Will not fit
- Will not fiterror · Rear DerailleurSpeed mismatch: Shifter 12s, Rear derailleur 13s. The drivetrain must share one speed count. On 5 of the 20 verified rear derailleurs in this catalog.
- Will not fiterror · CassetteSpeed mismatch: Shifter 12s, Cassette 13s. The drivetrain must share one speed count. On 4 of the 18 verified cassettes in this catalog.
- Will not fiterror · Front DerailleurDrivetrain mismatch: Shifter = shimano-grx-12, Front derailleur = sram-axs-road. Shifter, derailleurs and cassette must be one system. On 4 of the 11 verified front derailleurs in this catalog.
- Will not fiterror · Rear DerailleurSpeed mismatch: Shifter 12s, Rear derailleur 11s. The drivetrain must share one speed count. On 4 of the 20 verified rear derailleurs in this catalog.
- Will not fiterror · Rear DerailleurDrivetrain mismatch: Shifter = shimano-grx-12, Rear derailleur = shimano-grx-11. Shifter, derailleurs and cassette must be one system. On 4 of the 20 verified rear derailleurs in this catalog.
Rg 2x control, Crankset. 14 more findings from the same check, on up to 1 of the 33 verified cranksets each.
Rg actuation, Rear Derailleur. 9 more findings from the same check, on up to 2 of the 20 verified rear derailleurs each.
Rg drivetrain system, Cassette. 7 more findings from the same check, on up to 3 of the 18 verified cassettes each.
Rg actuation, Front Derailleur. 6 more findings from the same check, on up to 1 of the 11 verified front derailleurs each.
Rg chain std, Chain. 6 more findings from the same check, on up to 1 of the 17 verified chains each.
Rg drivetrain system, Rear Derailleur. 6 more findings from the same check, on up to 3 of the 20 verified rear derailleurs each.
Rg drivetrain system, Front Derailleur. 3 more findings from the same check, on up to 3 of the 11 verified front derailleurs each.
Rg brake fluid, Front Caliper. 2 more findings from the same check, on up to 1 of the 27 verified calipers each.
Rg brake fluid, Rear Caliper. 2 more findings from the same check, on up to 1 of the 27 verified calipers each.
Rg drivetrain speeds, Cassette. 2 more findings from the same check, on up to 3 of the 18 verified cassettes each.
Rg drivetrain speeds, Rear Derailleur. 1 more finding from the same check, on up to 3 of the 20 verified rear derailleurs each.
Open a variant in the builder to see the ones that apply to your own parts.
$900.00 MSRP·620 g
What the maker states
- System
- Drivetrain system shimano-grx-12
- Speeds
- 12-speed (rear index count the maker rates it for)
- Actuation
- Mechanical
- Brake system
- Disc-hydraulic
- Side
- Sold as a pair
- Front shift
- No front shifting
The rest of what the maker states1 stated·1 not published
- Brake fluid: mineral.
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 shifter/brake levers. It is brake closed system. Each is recorded as “not stated by the maker (not checked)”.
Source: the maker’s page. Last checked 2026-07-17.
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) No conflicts found
6 of 504 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.