2021 Polygon Bikes Siskiu D7 S (27.5″)
Build
650B/27.5 in × 2.25 in
Insights
Somewhat aggressive stack and reach vs trend of full-suspension trail mtb bikes
Design deviates from other sizes of Polygon Bikes Siskiu
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 571.2mm |
| Reach | 425mm |
| Stack to Reach Ratio | 1.34:1 |
| Seat Tube Length, Unknown | 395mm |
| Top Tube Length, Effective/Horizontal Center | 572.7mm |
| Top Tube Slope | 19.7deg |
| Head Tube Angle | 67deg |
| Seat Tube Angle | 70deg |
| Effective Seat Tube Angle, Unknown | 75.5deg |
| Head Tube Length | 102mm |
| Bottom Bracket Drop | 27mm |
| Bottom Bracket Height | 322.2mm |
| Chainstay Length | 432mm |
| Chainstay Length Horizontal | 431.2mm |
| Front-Center | 702.4mm |
| Front-Center Horizontal | 701.8mm |
| Wheelbase | 1133mm |
| Fork Offset/Rake | 42.2mm |
| Trail | 102.4mm very high |
| Mechanical Trail | 94.2mm |
| Wheel Flop | 36.8mm |
| Standover Height | 676mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 183.2mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 152.2mm |
D7 Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.25in |
| Tire Outer Diameter | 698.3mm |
| Bike Length with Tires | 1831.3mm |
| Suspension Type | Full suspension |
| Bar Type | Flat Bar |
| Fork Travel | 120mm |
| Rear Travel | Unknown |
| Suspension Sag | Unknown |
| Frame Material | Aluminum |
| Fork Material | Steel |
| Brake Type | Disc |
Source:https://www.polygonbikes.com/product/mountain/siskiu-d7-5/