2025 Soma Fabrications Rush Base 57
Build
700C/29 in × 28 mm
Insights
Somewhat aggressive stack and reach vs trend of track/fixed-gear bikes
Stack and Reach vs. Category Trend
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Geometry
| Stack | 556mm |
| Reach | 419mm |
| Stack to Reach Ratio | 1.33:1 |
| Seat Tube Length, C-T | 570mm |
| Top Tube Length, Effective/Horizontal Center | 565mm |
| Top Tube Slope | 0.5deg |
| Head Tube Angle | 74.6deg |
| Seat Tube Angle | 75.3deg |
| Head Tube Length | 145mm |
| Bottom Bracket Drop | 58mm |
| Bottom Bracket Height | 281mm |
| Chainstay Length | 393mm |
| Chainstay Length Horizontal | 388.7mm |
| Front-Center | 598mm |
| Front-Center Horizontal | 595.3mm |
| Wheelbase | 984mm |
| Fork Offset/Rake | 38mm |
| Trail | 54mm mid/neutral |
| Mechanical Trail | 52mm |
| Wheel Flop | 13.8mm |
| Standover Height | 32.3mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 89mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 111mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 28mm |
| Tire Outer Diameter | 678mm |
| Bike Length with Tires | 1662mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Steel |
| Fork Material | Steel |
| Brake Type | Unknown |
Source:https://www.somafab.com/archives/product/rush-fixed-gear-ss