Shimano GRX BR-RX820 Caliper (pair) Front Caliper
What the checker says3will 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 1025 verified road bike parts in this catalog. 1008 produced no finding of any kind.
Will not fit
- Will not fiterror · Front WheelBrake system mismatch: Front wheel = rim, Front brake = disc. Disc and rim-brake parts do not mix on one build. On 7 of the 101 verified front wheels in this catalog.
- Will not fiterror · Rear WheelBrake system mismatch: Rear wheel = rim, Front brake = disc. Disc and rim-brake parts do not mix on one build. On 7 of the 112 verified rear wheels in this catalog.
- Will not fiterror · Shifter/Brake LeversBrake system mismatch: Levers = rim, Front brake = disc. Disc and rim-brake parts do not mix on one build. On 3 of the 25 verified shifter/brake levers in this catalog.
$130.00 MSRP·270 g
What the maker states
- Mount
- flat-mount caliper
- Pistons
- 2-piston caliper
- Brake system
- Disc-flat
- Actuation
- Hydraulic
The rest of what the maker states2 not published
2 further fields the checker looks for are not published by Shimano, so we leave them blank rather than estimate them, and those 2 checks stay silent on this front caliper. They are reach and maximum rotor. Each is recorded as “not stated by the maker (not checked)”.
Source: the maker’s page. 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) No conflicts found
- Argon 18 SUM D-Shape Seatpost (Seatpost) No conflicts found
- Argon 18 Sum Frameset (Frame) No conflicts found
6 of 690 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.