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