2021 Thesis Bike OB1 Base (650B) XS

Build

650B/27.5 in × 47 mm

Insights

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

Stack and Reach vs. Category Trend
View all sizes

Geometry

Stack
521mm
Reach
356mm
Stack to Reach Ratio
1.46:1
Seat Tube Length, C-T
440mm
Top Tube Length, Effective/Horizontal HT Top
515mm
Top Tube Slope
11.7deg
Head Tube Angle
70deg
Seat Tube Angle
73deg
Head Tube Length
110mm
Bottom Bracket Drop
73mm
Bottom Bracket Height
266mm
Chainstay Length
420mm
Chainstay Length Horizontal
413.6mm
Front-Center
578mm
Front-Center Horizontal
573.4mm
Wheelbase
987mm
Fork Offset/Rake
51mm
Fork Length (On-Axis)
385mm
Trail
69.1mm
high
Mechanical Trail
64.9mm
Wheel Flop
22.2mm
Standover Height
720mm
Tire to Pedal Spindle Distance
With 155 mm cranks
84mm
Pedal Spindle to Ground Clearance
With 155 mm cranks
111mm

Base (650B) Build

Wheel Size
650B, 27.5 inch (584mm BSD)
Tire Width
47mm
Tire Outer Diameter
678mm
Bike Length with Tires
1665mm
Crank Length
155mm
Handlebar Width
380mm
Stem Length
80mm
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 1 in
to
5 ft 5 in
Source:https://thesis.bike/products/the-ob1-original