Otso Warakin - Builder 1x12 Shimano GRX 800

2026 RoadGravel Manufacturer page

Last known price: $3,550

Prices shown first for United States
Suspension: Rigid
Wheels: 650b
Drivetrain: 1 × 12 38t / 10–51t
Gear range: 510%
Frame: Steel
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

49cm 149.9–159
52cm 156–164
54cm 161–174
56cm 171–184
58cm 181–189
60m 187–195.6

Components

5 of 12 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.

Frame and fork

1 part

Frame

Otso custom butted 4130 Chromoly tubing with Tuning Chip™️ dropout system Not identified

Drivetrain

3 parts

Bottom bracket

68mm BSA threaded Not identified
Cassette
- Shimano 10–51t
Crankset
- Wolf Tooth 38t

Brakes

2 parts

Brakes

Flat mount, 74mm post mount available(160mm) Not identified
Disc rotors

Flat mount, 74mm post mount available(160mm) Not identified

Wheels and tires

2 parts

Cockpit and contact points

4 parts

Handlebar

Lithic Aventurine 40cm Not identified
Headset

ZS44/28.6 upper, EC44/40.0 lower Not identified
Saddle
- WTB Silverado
Seatpost

Ø27.2mm Not identified

Sizes and geometry

6 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size 54cm

Table

Geometry diagram unavailable

The drawing needs seat tube angle, which the manufacturer did not publish. Available facts remain in the table.

Size Reported by the manufacturer

Complete manufacturer geometry table 6 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	368	378	381	383	384	392
Stackmm	532	549	570	596	622	641
Top tube lengthmm	510	530	545	565	580	600
Seat tube lengthmm	400	505	530	550	570	590
Head tube lengthmm	87	95	115	140	165	185
Head tube angle	70°	70.5°	71°	71.5°	72°	72°
Chainstay lengthmm	410	420	420	420	420	420
Wheelbasemm	1000	1017	1023	1028	1032	1046
Front centermm	597	606	612	617	621	635
Bottom bracket dropmm	58	68	68	68	68	68
Standover heightmm	677	760	780	800	820	840
Fork rakemm	47	47	47	47	47	47
Trailmm	70	71	70	67.5	65	65
Stack/reach ratio	1.45	1.45	1.50	1.56	1.62	1.64

Not published by the manufacturer: Seat tube angle, Bottom bracket height, 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
Frame material: Steel
Frame weight: 2.51 kg

5.5 lb
Weight limit: 124.74 kg

275.0 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 38
Largest chainring: 38
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 51
Lowest gear: 20.5 in
Highest gear: 104.5 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: BSA
Tire clearance: Maximum tire width: 50c; Additional specification: Wheel kind: 27.5
Tire width: 45c
Wheel material: Aluminum
Wheel size: 650b

Technical analysis

3 measures

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

Lowest gear

20.5 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

104.5 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

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: 7.8 km/h
Highest gear: 40.0 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: 20.5–104.5 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

Differences across 2026 builds
Specification	This bicycle Otso Warakin - Builder 1x12 Shimano GRX 800	Otso Warakin - Builder 1x12 Shimano GRX 600	Otso Warakin - Builder 1x12 Shimano GRX Di2	Otso Warakin - Builder 1x12 SRAM Force XPLR AXS D2	Otso Warakin - Builder 1x12 SRAM Rival AXS Mullet	Otso Warakin Shimano GRX 600
Drivetrain
Front chainrings	1	1	1	1	1	Not informed
Smallest chainring	38	38	38	40	40	Not informed
Largest chainring	38	38	38	40	40	Not informed
Rear sprockets	12	12	12	12	12	Not informed
Smallest sprocket	10	10	10	10	11	Not informed
Largest sprocket	51	51	51	44	50	Not informed
Lowest gear	20.5 in	20.5 in	20.5 in	25.0 in	23.2 in	Not informed
Highest gear	104.5 in	104.5 in	104.5 in	110.0 in	105.5 in	Not informed
Wheels
Wheel configuration	Same size	Same size	Same size	Same size	Different sizes	Same size
Other specifications
Tire width	45c	45c	45c	45c	45c	Not informed
Wheel material	Aluminum	Aluminum	Aluminum	Aluminum	Aluminum	Not informed
Wheel size	650b	650b	650b	650b	29″ / 27.5″	700c