2018-2019 Surly Bikes Midnight Special Base
- Category
- All-road/Gravel
- Design
- Drop Bar, Rigid, non-suspension corrected
- Frame
- Steel
- Fork
- Steel
- Features
- Disc brake
Average stack and reachvs category | Average stack and reachvs category | Somewhat aggressive stack and reachvs category | Somewhat aggressive stack and reachvs category | Somewhat aggressive stack and reachvs category | Somewhat aggressive stack and reachvs category | Somewhat aggressive stack and reachvs category | Somewhat aggressive stack and reachvs category |
Geometry
40cm | 46cm | 50cm | 54cm | 56cm | 58cm | 60cm | 64cm | |
Stack | 531mm | 538mm | 544mm | 560mm | 580mm | 599mm | 620mm | 641mm |
Reach | 363mm | 366mm | 379mm | 389mm | 393mm | 402mm | 409mm | 423mm |
Stack to Reach Ratio | 1.46:1 | 1.47:1 | 1.44:1 | 1.44:1 | 1.48:1 | 1.49:1 | 1.52:1 | 1.52:1 |
Seat Tube Length, C-TTT | 400mm | 460mm | 500mm | 540mm | 560mm | 580mm | 600mm | 640mm |
Top Tube Length, Effective/Horizontal HT Top | 500mm | 520mm | 540mm | 555mm | 570mm | 585mm | 605mm | 625mm |
Top Tube Length, Actual C-C | 487mm | 506mm | 531mm | 552mm | 564mm | 579mm | 597mm | 622mm |
Top Tube Slope | 14.9deg | 8.7deg | 4.9deg | 2.4deg | 2.6deg | 2.5deg | 2.8deg | 1.1deg |
Head Tube Angle | 71deg | 71.5deg | 72deg | 72.5deg | 73deg | 73deg | 73.5deg | 74deg |
Seat Tube Angle | 75.5deg | 74deg | 73.5deg | 73.5deg | 73deg | 73deg | 72.5deg | 72.5deg |
Head Tube Length | 95mm | 100mm | 110mm | 125mm | 140mm | 160mm | 180mm | 200mm |
Bottom Bracket Drop | 70mm | 70mm | 65mm | 65mm | 65mm | 65mm | 65mm | 65mm |
Bottom Bracket Height | 269mm | 269mm | 274mm | 274mm | 274mm | 274mm | 274mm | 274mm |
Chainstay Length | 425mm | 425mm | 425mm | 425mm | 425mm | 425mm | 425mm | 425mm |
Chainstay Length Horizontal | 419.2mm | 419.2mm | 420mm | 420mm | 420mm | 420mm | 420mm | 420mm |
Front-Center | 578.1mm | 579.1mm | 590.6mm | 601.5mm | 595.6mm | 610.5mm | 619.4mm | 633.3mm |
Front-Center Horizontal | 573.8mm | 574.8mm | 587mm | 598mm | 592mm | 607mm | 616mm | 630mm |
Wheelbase | 993mm | 994mm | 1007mm | 1018mm | 1012mm | 1027mm | 1036mm | 1050mm |
Fork Offset/Rake | 50mm | 50mm | 50mm | 50mm | 40mm | 40mm | 40mm | 40mm |
Fork Length (Axle-To-Crown) | 400mm | 400mm | 400mm | 400mm | 400mm | 400mm | 400mm | 400mm |
Trail | 63.9mm mid/​neutral | 60.7mm mid/​neutral | 57.6mm mid/​neutral | 54.5mm mid/​neutral | 61.8mm mid/​neutral | 61.8mm mid/​neutral | 58.7mm mid/​neutral | 55.6mm mid/​neutral |
Mechanical Trail | 60.4mm | 57.6mm | 54.8mm | 51.9mm | 59.1mm | 59.1mm | 56.3mm | 53.4mm |
Wheel Flop | 19.7mm | 18.3mm | 16.9mm | 15.6mm | 17.3mm | 17.3mm | 16mm | 14.7mm |
Standover Height | 720mm | 751mm | 778mm | 806mm | 827mm | 846mm | 866mm | 895mm |
Tire to Pedal Spindle | 69.1mm 170 mm cranks | 70.1mm 170 mm cranks | 81.6mm 170 mm cranks | 92.5mm 170 mm cranks | 86.6mm 170 mm cranks | 101.5mm 170 mm cranks | 110.4mm 170 mm cranks | 124.3mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 99mm 170 mm cranks | 99mm 170 mm cranks | 104mm 170 mm cranks | 104mm 170 mm cranks | 104mm 170 mm cranks | 104mm 170 mm cranks | 104mm 170 mm cranks | 104mm 170 mm cranks |
Base Build
40cm | 46cm | 50cm | 54cm | 56cm | 58cm | 60cm | 64cm | |
Wheel Size | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD |
Tire Width | 47mm | 47mm | 47mm | 47mm | 47mm | 47mm | 47mm | 47mm |
Tire Outer Diameter | 678mm | 678mm | 678mm | 678mm | 678mm | 678mm | 678mm | 678mm |
Bike Length with Tires | 1671mm | 1672mm | 1685mm | 1696mm | 1690mm | 1705mm | 1714mm | 1728mm |
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 ScaleCategory Trend
All-road/GravelSource:https://surlybikes.com/bikes/midnight_special/geometry