2025 Polygon Bikes Siskiu D6
- Category
- Full-suspension Trail MTB
- Design
- Flat Bar, Full suspension
- Suspension
- 120mm fork travel, 120mm rear travel, 30% sag
Geometry
N/A | S | M | L | XL | |
Stack | — | 579.4mm | 606.7mm | 615.9mm | 625.2mm |
Reach | — | 425mm | 445mm | 465mm | 485mm |
Stack to Reach Ratio | — | 1.36:1 | 1.36:1 | 1.32:1 | 1.29:1 |
Seat Tube Length, C-T | — | — | — | 487mm | 522mm |
Top Tube Length, Effective/Horizontal Center | — | 579.5mm | 603.9mm | 624.3mm | 646.7mm |
Top Tube Slope | — | — | — | 13.8deg | 11deg |
Head Tube Angle | — | 67.5deg | 67.5deg | 67deg | 67deg |
Seat Tube Angle | — | 75.5deg | 76deg | 76deg | 76deg |
Head Tube Length | — | 90mm | 102mm | 112mm | 122mm |
Bottom Bracket Drop | — | 38.2mm | 42.2mm | 42.2mm | 42.2mm |
Bottom Bracket Height | — | 330mm | 326mm | 326mm | 326mm |
Chainstay Length | — | 435mm | 436mm | 436mm | 436mm |
Chainstay Length Horizontal | — | 433.3mm | 434mm | 434mm | 434mm |
Front-Center | — | 708.9mm | 732.3mm | 756.2mm | 780.2mm |
Front-Center Horizontal | — | 707.9mm | 731mm | 755mm | 779mm |
Wheelbase | — | 1141.2mm | 1165mm | 1189mm | 1213mm |
Fork Offset/Rake | — | 54.2mm | 48.2mm | 42.8mm | 42.9mm |
Trail | — — | 93.8mm very high | 100.3mm very high | 109.8mm very high | 109.7mm very high |
Mechanical Trail | — | 86.7mm | 92.7mm | 101mm | 101mm |
Wheel Flop | — | 33.2mm | 35.5mm | 39.5mm | 39.5mm |
Standover Height | — | 672mm | 698mm | 733mm | 761mm |
Tire to Pedal Spindle | — 170 mm cranks | 170.8mm 170 mm cranks | 194.1mm 170 mm cranks | 218.1mm 170 mm cranks | 242mm 170 mm cranks |
Pedal Spindle to Ground Clearance | — 170 mm cranks | 160mm 170 mm cranks | 156mm 170 mm cranks | 156mm 170 mm cranks | 156mm 170 mm cranks |
D6 Build
N/A | S | M | L | XL | |
Wheel Size | 700C/29 in 622 mm BSD | 700C/29 in 622 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 | 736.3mm | 736.3mm | 736.3mm | 736.3mm | 736.3mm |
Bike Length with Tires | — | 1877.5mm | 1901.3mm | 1925.3mm | 1949.3mm |
Crank Length | — | 170mm | 170mm | 170mm | 170mm |
Handlebar Width | — | 760mm | 760mm | 760mm | 760mm |
Stem Length | — | 45mm | 45mm | 45mm | 45mm |
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:bikesonline.com