2025 Rivendell Bicycle Works Atlantis Base 55
Build
700C/29 in × 50 mm
Insights
Somewhat 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 | 618mm |
| Reach | 408mm |
| Stack to Reach Ratio | 1.51:1 |
| Seat Tube Length, C-T | 550mm |
| Top Tube Length, Effective/Horizontal Unknown | 610mm |
| Top Tube Slope | 6deg |
| Head Tube Angle | 70deg |
| Seat Tube Angle | 72deg |
| Bottom Bracket Drop | 80mm |
| Bottom Bracket Height | 281mm |
| Chainstay Length | 535mm |
| Chainstay Length Horizontal | 529mm |
| Trail | — — |
| Standover Height | 835mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | — |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 111mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 50mm |
| Tire Outer Diameter | 722mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Swept Back Bar |
| Frame Material | Steel |
| Fork Material | Steel |
| Brake Type | Rim |
Published Sizing Recommendations
| PBH | 85.5 cm to 89.5 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