2026 Surly Bikes Big Dummy Base Medium
Build
26 in × 2.5 in
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 599mm |
| Reach | 431mm |
| Stack to Reach Ratio | 1.39:1 |
| Seat Tube Length, C-T | 432mm |
| Top Tube Length, Effective/Horizontal HT Top | 620mm |
| Top Tube Slope | 18.4deg |
| Head Tube Angle | 70deg |
| Seat Tube Angle | 72.5deg |
| Head Tube Length | 180mm |
| Bottom Bracket Drop | 40mm |
| Bottom Bracket Height | 303mm |
| Chainstay Length | 821mm |
| Chainstay Length Horizontal | 820mm |
| Front-Center | 681.2mm |
| Front-Center Horizontal | 680mm |
| Wheelbase | 1500mm |
| Fork Offset/Rake | 43mm |
| Fork Length, Unknown | 418mm |
| Trail | 79.1mm high |
| Mechanical Trail | 74.3mm |
| Wheel Flop | 25.4mm |
| Standover Height | 773mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 168.2mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 133mm |
Base Build
| Wheel Size | 26 inch (559mm BSD) |
| Tire Width | 2.5in |
| Tire Outer Diameter | 686mm |
| Bike Length with Tires | 2186mm |
| Crank Length | 170mm |
| Handlebar Width | 735mm |
| Stem Length | 70mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Flat Bar |
| Frame Material | Steel |
| Fork Material | Steel |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 167 cm to 183 cm |
Source:surlybikes.com