2021 Surly Bikes ECR 27+ Base S
Build
650B/27.5 in × 3 in
Insights
Design deviates from other sizes of Surly Bikes ECR 27+
Stack and Reach vs. Category Trend
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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