2020 Surly Bikes ECR 29+ Base

Category
Rigid MTB
Design
Flat Bar, Rigid, non-suspension corrected
Frame
Steel
Fork
Steel
Features
Disc brake
Somewhat upright stack and reachvs category
Somewhat upright stack and reachvs category
Very upright stack and reachvs category

Geometry

M
L
XL
Stack
609.5mm
633mm
656.5mm
Reach
408mm
420.5mm
433mm
Stack to Reach Ratio
1.49:1
1.51:1
1.52:1
Seat Tube Length, C-T
457.2mm
507.9mm
558.7mm
Top Tube Length, Effective/Horizontal HT Top
600mm
620mm
640mm
Top Tube Length, Actual C-C
560.5mm
580mm
600mm
Top Tube Slope
17.6deg
14.5deg
11.6deg
Head Tube Angle
70deg
70deg
70deg
Seat Tube Angle
72.5deg
72.5deg
72.5deg
Head Tube Length
100mm
125mm
150mm
Bottom Bracket Drop
80mm
80mm
80mm
Bottom Bracket Height
307.2mm
307.2mm
307.2mm
Chainstay Length
451mm
451mm
451mm
Chainstay Length Horizontal
443.9mm
443.9mm
443.9mm
Front-Center
651.1mm
671.9mm
693.3mm
Front-Center Horizontal
646.2mm
667.2mm
688.7mm
Wheelbase
1090mm
1111mm
1132.5mm
Fork Offset/Rake
43mm
43mm
43mm
Fork Length (Axle-To-Crown)
468mm
468mm
468mm
Trail
95.2mm
very high
95.2mm
very high
95.2mm
very high
Mechanical Trail
89.4mm
89.4mm
89.4mm
Wheel Flop
30.6mm
30.6mm
30.6mm
Standover Height
805mm
840mm
875mm
Tire to Pedal Spindle
88.9mm
175 mm cranks
109.7mm
175 mm cranks
131.1mm
175 mm cranks
Pedal Spindle to Ground Clearance
132.2mm
175 mm cranks
132.2mm
175 mm cranks
132.2mm
175 mm cranks

Base Build

M
L
XL
Wheel Size
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
Tire Width
3in
3in
3in
Tire Outer Diameter
774.4mm
774.4mm
774.4mm
Bike Length with Tires
1864.4mm
1885.4mm
1906.9mm
Crank Length
175mm
175mm
175mm
Handlebar Width
735mm
735mm
735mm
Stem Length
70mm
70mm
80mm
Stem Angle
6deg
6deg
6deg

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 Scale
Category Trend
Rigid MTB
Source:https://surlybikes.com/bikes/ecr