2021 Surly Bikes ECR 27+ Base S

Build

650B/27.5 in × 3 in

Insights

Average stack and reach vs trend of rigid mtb bikes
Design deviates from other sizes of Surly Bikes ECR 27+

Stack and Reach vs. Category Trend
View all sizes

Geometry

Stack
579.5mm
Reach
398mm
Stack to Reach Ratio
1.46:1
Seat Tube Length, C-T
406.4mm
Top Tube Length, Effective/Horizontal HT Top
575mm
Top Tube Length, Actual C-C
547mm
Top Tube Slope
20.3deg
Head Tube Angle
69deg
Seat Tube Angle
73deg
Head Tube Length
115mm
Bottom Bracket Drop
60mm
Bottom Bracket Height
308.2mm
Chainstay Length
435mm
Chainstay Length Horizontal
430.8mm
Front-Center
646mm
Front-Center Horizontal
643.2mm
Wheelbase
1074mm
Fork Offset/Rake
43.2mm
Fork Length (Axle-To-Crown)
447mm
Trail
95.1mm
very high
Mechanical Trail
88.8mm
Wheel Flop
31.8mm
Standover Height
766mm
Tire to Pedal Spindle Distance
With 170 mm cranks
107.8mm
Pedal Spindle to Ground Clearance
With 170 mm cranks
138.2mm

Base Build

Wheel Size
650B, 27.5 inch (584mm BSD)
Tire Width
3in
Tire Outer Diameter
736.4mm
Bike Length with Tires
1810.4mm
Crank Length
170mm
Handlebar Width
685mm
Stem Length
60mm
Stem Angle
6deg
Suspension Type
Rigid, non-suspension corrected
Bar Type
Flat Bar
Frame Material
Steel
Fork Material
Steel
Brake Type
Disc
Source:https://surlybikes.com/bikes/ecr