2025 Rivendell Bicycle Works Atlantis Base 50
Build
650B/27.5 in × 48 mm
Insights
Very aggressive stack and reach vs trend of off-road touring bikes
Design deviates from other sizes of Rivendell Bicycle Works Atlantis
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 566mm |
| Reach | 389mm |
| Stack to Reach Ratio | 1.46:1 |
| Seat Tube Length, C-T | 500mm |
| Top Tube Length, Effective/Horizontal Unknown | 575mm |
| Top Tube Slope | 6deg |
| Head Tube Angle | 70deg |
| Seat Tube Angle | 72deg |
| Bottom Bracket Drop | 58mm |
| Bottom Bracket Height | 282mm |
| Chainstay Length | 520mm |
| Chainstay Length Horizontal | 516.8mm |
| Trail | — — |
| Standover Height | 780mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | — |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 112mm |
Base Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 48mm |
| Tire Outer Diameter | 680mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Swept Back Bar |
| Frame Material | Steel |
| Fork Material | Steel |
| Brake Type | Rim |
Published Sizing Recommendations
| PBH | 79.5 cm to 83.5 cm |
Source:https://cdn.shopify.com/s/files/1/1403/7343/files/RBW_Bicycle_Geometry_-_July_25.jpg?v=1770846580, https://cdn.shopify.com/s/files/1/1403/7343/files/RBW_Bicycle_Geometries_August_2025.pdf