2025 Soma Fabrications Rush Base 55
Build
700C/29 in × 28 mm
Insights
Average stack and reach vs trend of track/fixed-gear bikes
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 540mm |
| Reach | 408mm |
| Stack to Reach Ratio | 1.32:1 |
| Seat Tube Length, C-T | 550mm |
| Top Tube Length, Effective/Horizontal Center | 550mm |
| Top Tube Slope | 0.8deg |
| Head Tube Angle | 74.3deg |
| Seat Tube Angle | 75.3deg |
| Head Tube Length | 130mm |
| Bottom Bracket Drop | 58mm |
| Bottom Bracket Height | 281mm |
| Chainstay Length | 393mm |
| Chainstay Length Horizontal | 388.7mm |
| Front-Center | 586mm |
| Front-Center Horizontal | 583.3mm |
| Wheelbase | 972mm |
| Fork Offset/Rake | 38mm |
| Trail | 55.8mm mid/neutral |
| Mechanical Trail | 53.7mm |
| Wheel Flop | 14.5mm |
| Standover Height | 31.6mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 77mm |
| 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 | 1650mm |
| 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