2021 Polygon Bikes Siskiu D7
- Category
- Full-suspension Trail MTB
- Design
- Flat Bar, Full suspension
- Frame
- Aluminum
- Fork
- Steel
- Suspension
- 120mm fork travel
- Features
- Disc brake
Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry |
Geometry
S (27.5″) | M (27.5″) | M (29″) | L (29″) | XL (29″) | |
Stack | 571.2mm | 580.4mm | 606.7mm | 615.9mm | 625.2mm |
Reach | 425mm | 445mm | 445mm | 465mm | 485mm |
Stack to Reach Ratio | 1.34:1 | 1.3:1 | 1.36:1 | 1.32:1 | 1.29:1 |
Seat Tube Length, Unknown | 395mm | 435mm | 435mm | 487mm | 522mm |
Top Tube Length, Effective/Horizontal Center | 572.7mm | 595.1mm | 603.9mm | 624.3mm | 646.7mm |
Top Tube Slope | 19.7deg | 16.1deg | 18.5deg | 14.2deg | 11.6deg |
Head Tube Angle | 67deg | 67deg | 67.5deg | 67.5deg | 67.5deg |
Seat Tube Angle | 70deg | 70deg | 68.7deg | 68.7deg | 68.7deg |
Effective Seat Tube Angle, Unknown | 75.5deg | 75.5deg | 76deg | 76deg | 76deg |
Head Tube Length | 102mm | 105mm | 102mm | 112mm | 122mm |
Bottom Bracket Drop | 27mm | 27mm | 47mm | 47mm | 47mm |
Bottom Bracket Height | 322.2mm | 322.2mm | 321.2mm | 321.2mm | 321.2mm |
Chainstay Length | 432mm | 432mm | 436mm | 436mm | 436mm |
Chainstay Length Horizontal | 431.2mm | 431.2mm | 433.5mm | 433.5mm | 433.5mm |
Front-Center | 702.4mm | 726.4mm | 733.1mm | 757mm | 781mm |
Front-Center Horizontal | 701.8mm | 725.8mm | 731.5mm | 755.5mm | 779.5mm |
Wheelbase | 1133mm | 1157mm | 1165mm | 1189mm | 1213mm |
Fork Offset/Rake | 42.2mm | 42.3mm | 51mm | 50.7mm | 50.9mm |
Fork Length (Axle-To-Crown) | — | — | 529mm | — | — |
Trail | 102.4mm very high | 102.3mm very high | 97.3mm very high | 97.6mm very high | 97.5mm very high |
Mechanical Trail | 94.2mm | 94.1mm | 89.9mm | 90.2mm | 90mm |
Wheel Flop | 36.8mm | 36.8mm | 34.4mm | 34.5mm | 34.5mm |
Standover Height | 676mm | 696mm | 698mm | 733mm | 761mm |
Tire to Pedal Spindle | 183.2mm 170 mm cranks | 207.2mm 170 mm cranks | 194.9mm 170 mm cranks | 218.9mm 170 mm cranks | 242.8mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 152.2mm 170 mm cranks | 152.2mm 170 mm cranks | 151.2mm 170 mm cranks | 151.2mm 170 mm cranks | 151.2mm 170 mm cranks |
D7 Build
S (27.5″) | M (27.5″) | M (29″) | L (29″) | XL (29″) | |
Wheel Size | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 2.25in | 2.25in | 2.25in | 2.25in | 2.25in |
Tire Outer Diameter | 698.3mm | 698.3mm | 736.3mm | 736.3mm | 736.3mm |
Bike Length with Tires | 1831.3mm | 1855.3mm | 1901.3mm | 1925.3mm | 1949.3mm |
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
Full-suspension Trail MTBSource:https://www.polygonbikes.com/product/mountain/siskiu-d7-5/