2018 Soma Fabrications Riff Base
- Category
- Hardtail Trail MTB
- Design
- Flat Bar, Hardtail (Front suspension)
- Frame
- Steel
- Suspension
- 120mm fork travel
- Features
- Disc brake
Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry |
Geometry
XS | SM | MD | LG | |
Stack | 579mm | 589mm | 593mm | 598mm |
Reach | 386mm | 403mm | 426mm | 454mm |
Stack to Reach Ratio | 1.5:1 | 1.46:1 | 1.39:1 | 1.32:1 |
Seat Tube Length, C-T | 380mm | 410mm | 440mm | 470mm |
Top Tube Length, Effective/Horizontal Center | 560mm | 585mm | 610mm | 640mm |
Top Tube Slope | 23.5deg | 20.6deg | 17.3deg | 14.1deg |
Head Tube Angle | 68deg | 68deg | 68deg | 68deg |
Seat Tube Angle | 73.5deg | 73deg | 73deg | 73deg |
Head Tube Length | 100mm | 110mm | 115mm | 120mm |
Bottom Bracket Drop | 44mm | 44mm | 44mm | 44mm |
Bottom Bracket Height | 301.3mm | 301.3mm | 301.3mm | 301.3mm |
Chainstay Length | 427mm | 427mm | 427mm | 427mm |
Chainstay Length Horizontal | 424.7mm | 424.7mm | 424.7mm | 424.7mm |
Front-Center | 653mm | 674mm | 699mm | 729mm |
Front-Center Horizontal | 651.3mm | 672.3mm | 697.3mm | 727.3mm |
Wheelbase | 1076mm | 1097mm | 1122mm | 1152mm |
Fork Offset/Rake | 45.5mm | 45.5mm | 45.9mm | 45.8mm |
Fork Length (Axle-To-Crown) | 484mm | 484mm | 484mm | 484mm |
Trail | 90.4mm very high | 90.5mm very high | 90.1mm very high | 90.1mm very high |
Mechanical Trail | 83.8mm | 83.9mm | 83.5mm | 83.5mm |
Wheel Flop | 31.4mm | 31.4mm | 31.3mm | 31.3mm |
Standover Height | 749mm | 768mm | 784mm | 801mm |
Tire to Pedal Spindle | 137.7mm 170 mm cranks | 158.7mm 170 mm cranks | 183.7mm 170 mm cranks | 213.7mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 131.3mm 170 mm cranks | 131.3mm 170 mm cranks | 131.3mm 170 mm cranks | 131.3mm 170 mm cranks |
Base Build
XS | SM | MD | LG | |
Wheel Size | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD |
Tire Width | 2.1in | 2.1in | 2.1in | 2.1in |
Tire Width Max | 2.8in | 2.8in | 2.8in | 2.8in |
Tire Outer Diameter | 690.7mm | 690.7mm | 690.7mm | 690.7mm |
Bike Length with Tires | 1766.7mm | 1787.7mm | 1812.7mm | 1842.7mm |
Stack and Reach vs. Category Trend
Very Upright
Somewhat Upright
Average
Somewhat Aggressive
Very Aggressive
The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.
Learn more about the Upright/Aggressive ScaleCategory Trend
Hardtail Trail MTBSource:https://www.somafab.com/archives/product/riff-27-5-hardtail-frame