2025 POSST Oberon Rohloff 50
Build
650B/27.5 in × 50 mm
Insights
Design deviates from other sizes of POSST Oberon
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 550mm |
| Reach | 350mm |
| Stack to Reach Ratio | 1.57:1 |
| Seat Tube Length, C-T | 460mm |
| Top Tube Length, Effective/Horizontal HT Top | 512mm |
| Top Tube Slope | 12.8deg |
| Head Tube Angle | 68.5deg |
| Seat Tube Angle | 73.5deg |
| Head Tube Length | 127mm |
| Bottom Bracket Drop | 65mm |
| Bottom Bracket Height | 277mm |
| Chainstay Length | 453mm |
| Chainstay Length Horizontal | 448.3mm |
| Front-Center | 604mm |
| Front-Center Horizontal | 600.7mm |
| Wheelbase | 1049mm |
| Fork Offset/Rake | 55mm |
| Fork Length (Axle-To-Crown) | 407mm |
| Trail | 75.6mm high |
| Mechanical Trail | 70.3mm |
| Wheel Flop | 25.8mm |
| Standover Height | 725mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 92mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 107mm |
Rohloff Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 50mm |
| Tire Outer Diameter | 684mm |
| Bike Length with Tires | 1733mm |
| Crank Length | 170mm |
| Handlebar Width | 440mm |
| Stem Length | 80mm |
| Stem Angle | 8deg |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Steel |
| Fork Material | Steel |
| Brake Type | Disc |
Source:https://www.posst.bike/oberon