2021 Thesis Bike OB1 Base (650B) S

Build

650B/27.5 in × 47 mm

Insights

Somewhat upright stack and reach vs trend of all-road/gravel bikes

Stack and Reach vs. Category Trend
View all sizes

Geometry

Stack
551mm
Reach
363mm
Stack to Reach Ratio
1.52:1
Seat Tube Length, C-T
470mm
Top Tube Length, Effective/Horizontal HT Top
531mm
Top Tube Slope
11.5deg
Head Tube Angle
71deg
Seat Tube Angle
73deg
Head Tube Length
138mm
Bottom Bracket Drop
73mm
Bottom Bracket Height
266mm
Chainstay Length
420mm
Chainstay Length Horizontal
413.6mm
Front-Center
586mm
Front-Center Horizontal
581.4mm
Wheelbase
995mm
Fork Offset/Rake
51mm
Fork Length (On-Axis)
385mm
Trail
62.8mm
mid/​neutral
Mechanical Trail
59.4mm
Wheel Flop
19.3mm
Standover Height
750mm
Tire to Pedal Spindle Distance
With 160 mm cranks
87mm
Pedal Spindle to Ground Clearance
With 160 mm cranks
106mm

Base (650B) Build

Wheel Size
650B, 27.5 inch (584mm BSD)
Tire Width
47mm
Tire Outer Diameter
678mm
Bike Length with Tires
1673mm
Crank Length
160mm
Handlebar Width
400mm
Stem Length
90mm
Stem Angle
7deg
Suspension Type
Rigid, non-suspension corrected
Bar Type
Drop Bar
Frame Material
Carbon/Composite
Fork Material
Carbon/Composite
Brake Type
Disc

Published Sizing Recommendations

Height
5 ft 4 in
to
5 ft 8 in
Source:https://thesis.bike/products/the-ob1-original