2018 Soma Fabrications Riff Base XS
Build
650B/27.5 in × 2.1 in
Insights
Somewhat aggressive stack and reach vs trend of hardtail trail mtb bikes
Design deviates from other sizes of Soma Fabrications Riff
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 579mm |
| Reach | 386mm |
| Stack to Reach Ratio | 1.5:1 |
| Seat Tube Length, C-T | 380mm |
| Top Tube Length, Effective/Horizontal Center | 560mm |
| Top Tube Slope | 23.5deg |
| Head Tube Angle | 68deg |
| Seat Tube Angle | 73.5deg |
| Head Tube Length | 100mm |
| Bottom Bracket Drop | 44mm |
| Bottom Bracket Height | 301.3mm |
| Chainstay Length | 427mm |
| Chainstay Length Horizontal | 424.7mm |
| Front-Center | 653mm |
| Front-Center Horizontal | 651.3mm |
| Wheelbase | 1076mm |
| Fork Offset/Rake | 45.5mm |
| Fork Length (Axle-To-Crown) | 484mm |
| Trail | 90.4mm very high |
| Mechanical Trail | 83.8mm |
| Wheel Flop | 31.4mm |
| Standover Height | 749mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 137.7mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 131.3mm |
Base Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.1in |
| Tire Outer Diameter | 690.7mm |
| Bike Length with Tires | 1766.7mm |
| Suspension Type | Hardtail (Front suspension) |
| Bar Type | Flat Bar |
| Fork Travel | 120mm |
| Suspension Sag | Unknown |
| Frame Material | Steel |
| Fork Material | Unknown |
| Brake Type | Disc |
Source:https://www.somafab.com/archives/product/riff-27-5-hardtail-frame