2021 Thesis Bike OB1 Base (650B) M
Build
650B/27.5 in × 47 mm
Insights
Average stack and reach vs trend of all-road/gravel bikes
Design deviates from other sizes of Thesis Bike OB1
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 571mm |
| Reach | 378mm |
| Stack to Reach Ratio | 1.51:1 |
| Seat Tube Length, C-T | 500mm |
| Top Tube Length, Effective/Horizontal HT Top | 547mm |
| Top Tube Slope | 10deg |
| Head Tube Angle | 72deg |
| Seat Tube Angle | 73deg |
| Head Tube Length | 155mm |
| Bottom Bracket Drop | 73mm |
| Bottom Bracket Height | 266mm |
| Chainstay Length | 420mm |
| Chainstay Length Horizontal | 413.6mm |
| Front-Center | 598mm |
| Front-Center Horizontal | 593.4mm |
| Wheelbase | 1007mm |
| Fork Offset/Rake | 51mm |
| Fork Length (On-Axis) | 385mm |
| Trail | 56.5mm mid/neutral |
| Mechanical Trail | 53.8mm |
| Wheel Flop | 16.6mm |
| Standover Height | 775mm |
| Tire to Pedal Spindle Distance With 165 mm cranks | 94mm |
| Pedal Spindle to Ground Clearance With 165 mm cranks | 101mm |
Base (650B) Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 47mm |
| Tire Outer Diameter | 678mm |
| Bike Length with Tires | 1685mm |
| Crank Length | 165mm |
| Handlebar Width | 420mm |
| Stem Length | 100mm |
| 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 6 in to 5 ft 11 in |
Source:https://thesis.bike/products/the-ob1-original