Obed Boundary Shimano GRX 820 1x12 spd

2026 RoadGravel Manufacturer page

Suspension: Rigid
Wheels: 700c
Drivetrain: 1 × 12 40t / 10–51t
Gear range: 510%
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

XS 156–166
SM 163–174
MD 171–182
LG 179–189
XL 185–195

Components

10 of 16 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Suspension

1 part

Fork

Select in Builder Not identified

Drivetrain

6 parts

Bottom bracket

BB86 Press-Fit Not identified
Cassette
- Shimano Deore XT CS-M8100-12 12 speeds
CS-M8100-12
Chain
- Shimano Deore XT CN-M8100
CN-M8100
Crankset
- Shimano GRX FC-RX820 12 speeds 40t
FC-RX820
Rear derailleur
- Shimano GRX RD-RX822 12 speeds
RD-RX822
Shifters
- Shimano GRX ST-RX820
ST-RX820

Brakes

2 parts

Wheels and tires

2 parts

Rims

Select in Builder Not identified
Tires

Select in Builder Not identified

Cockpit and contact points

5 parts

Handlebar
- FSA A-WING AGX ALLOY
Headset
- Cane Creek
Saddle

Select in Builder Not identified
Seatpost

Select in Builder Not identified
Stem
- FSA Energy

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 376mm

Stack 568mm

Wheelbase 1026mm

Head angle 71.5°

Seat angle 73.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 700c wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 5 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	371	375	376	385	394
Stackmm	537	557	568	590	609
Top tube lengthmm	520	535	550	565	580
Seat tube lengthmm	490	520	540	560	580
Head tube lengthmm	120	140	150	170	190
Head tube angle	70.5°	71°	71.5°	72°	72°
Seat tube angle	74.5°	74°	73°	73°	73°
Chainstay lengthmm	435	435	435	435	435
Wheelbasemm	1020	1021	1026	1037	1052
Front centermm	594	595	600	611	626
Bottom bracket dropmm	67	67	67	67	67
Bottom bracket heightmm	282	282	282	282	282
Standover heightmm	759	786	803	823	843
Fork rakemm	50	50	50	50	50
Trailmm	71	73	64	61	61
Stack/reach ratio	1.45	1.49	1.51	1.53	1.55

Not published by the manufacturer: Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Fork material: Carbon

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 40
Largest chainring: 40
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 51
Lowest gear: 22.8 in
Highest gear: 116.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BB86/BB92
Wheel material: Aluminum
Wheel size: 700c

Technical analysis

3 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

22.8 gear inches

This value is below the central range for this class.

Cohort: Road / Gravel Model year: 2026
Sample: 1,452 bicycles with this information
Coverage: 73.2% of the class

Highest gear

116.0 gear inches

This value is within the central range for this class.

Cohort: Road / Gravel Model year: 2026
Sample: 1,452 bicycles with this information
Coverage: 73.2% of the class

Shifting

Mechanical

706 of 1,977 bicycles with this information use electronic shifting.

Cohort: Road / Gravel Model year: 2026
Sample: 1,977 bicycles with this information
Coverage: 99.6% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 8.7 km/h
Highest gear: 44.4 km/h

Total gear range 510%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 22.8–116.0 gear inches
Class reference (p10–p90): 22.8–127.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Gravel Model year: 2026
Lowest gear: 1452 bicycles with this information, 73.2% of the class
Highest gear: 1452 bicycles with this information, 73.2% of the class

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2026 builds
Specification	This bicycle Obed Boundary Shimano GRX 820 1x12 spd	Obed Boundary Carbon Shimano GRX 810 2x	Obed Boundary Carbon Shimano GRX 820 1x12 spd	Obed Boundary Carbon Shimano GRX 820 2x12 spd	Obed Boundary Carbon Shimano GRX 825 Di2 12 spd	Obed Boundary Carbon SRAM Apex XPLR
Frame
Frame material	Not informed	Carbon	Carbon	Carbon	Carbon	Carbon
Drivetrain
Front chainrings	1	2	1	2	2	1
Smallest chainring	40	30	40	31	31	40
Largest chainring	40	46	40	48	48	40
Rear sprockets	12	11	12	12	12	12
Smallest sprocket	10	11	10	11	11	11
Largest sprocket	51	34	51	34	34	44
Lowest gear	22.8 in	25.6 in	22.8 in	26.4 in	26.4 in	26.4 in
Highest gear	116.0 in	121.3 in	116.0 in	126.6 in	126.6 in	105.5 in
Cockpit
Shifting	Mechanical	Mechanical	Mechanical	Mechanical	Electronic	Mechanical