Thesis The OB1 Custom AXS

Name: Thesis The OB1 Custom AXS
Brand: Thesis

2026 RoadGravel Manufacturer page

Suspension: Rigid
Wheels: 700c
Drivetrain: 1 × 12 42t / 10–50t
Gear range: 500%
Frame: Carbon
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

XS 154.9–165.1
SM 162.6–172.7
MD 167.6–180.3
LG 177.8–188
XL 185.4–195.6

Components

12 of 20 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

Thesis OB1 Carbon Not identified

Suspension

1 part

Fork

Thesis OB1 Carbon with SteerSafe Not identified

Drivetrain

6 parts

Brakes

2 parts

Wheels and tires

5 parts

Front hub
- DT Swiss
Rear hub
- DT Swiss
Rims

Lōgōs Epoché 700C Not identified
Spokes
- Pillar
Tires
- WTB Exposure

Cockpit and contact points

5 parts

Handlebar

Thesis Compact Ergo Flare Not identified
Headset

Thesis Oversized Integrated Not identified
Saddle

Thesis Endurance 148 Saddle Not identified
Seatpost

Thesis Ultralight 3D Forged Not identified
Stem

Thesis Ultralight Not identified

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 378mm

Stack 571mm

Wheelbase 1007mm

Head angle 72.0°

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
Frame
Reachmm	356	363	378	388	403
Stackmm	521	551	571	595	614
Top tube lengthmm	515	531	547	570	591
Seat tube lengthmm	440	470	500	530	560
Head tube lengthmm	110	138	155	180	200
Head tube angle	70°	71°	72°	72°	72°
Seat tube angle	73°	73°	73°	73°	73°
Chainstay lengthmm	420	420	420	420	420
Wheelbasemm	987	995	1007	1025	1046
Front centermm	578	586	598	616	637
Bottom bracket dropmm	73	73	73	73	73
Bottom bracket heightmm	276	276	276	276	276
Standover heightmm	720	750	775	805	835
Fork rakemm	51	51	51	51	51
Trailmm	73	66	60	60	60
Stack/reach ratio	1.46	1.52	1.51	1.53	1.52
Suspension and parts
Crank lengthmm	155	160	165	170	175
Handlebar widthmm	380	400	420	420	440
Stem lengthmm	70	80	90	100	110

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

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Carbon
Fork material: Carbon

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 42
Largest chainring: 42
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 50
Lowest gear: 24.4 in
Highest gear: 121.8 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Electronic

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

24.4 gear inches

This value is within the central range for this class.

Cohort: Road / Gravel Model year: 2026
Sample: 1,455 bicycles with this information
Coverage: 73.2% of the class

Highest gear

121.8 gear inches

This value is within the central range for this class.

Cohort: Road / Gravel Model year: 2026
Sample: 1,455 bicycles with this information
Coverage: 73.2% of the class

Shifting

Electronic

706 of 1,980 bicycles with this information use electronic shifting.

Cohort: Road / Gravel Model year: 2026
Sample: 1,980 bicycles with this information
Coverage: 99.6% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 9.3 km/h
Highest gear: 46.7 km/h

Total gear range 500%

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: 24.4–121.8 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: 1455 bicycles with this information, 73.2% of the class
Highest gear: 1455 bicycles with this information, 73.2% of the class