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