2021 Polygon Bikes Siskiu T7
- Category
- Full-suspension Trail MTB
- Design
- Flat Bar, Full suspension
- Frame
- Aluminum
- Suspension
- 150mm fork travel, 140mm rear 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 | 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 |
Geometry
S (27.5″) | M (27.5″) | M(29″) | L (29″) | XL (29″) | |
Stack | 593.5mm | 607.1mm | 607.6mm | 621.2mm | 634.9mm |
Reach | 440mm | 460mm | 460mm | 480mm | 500mm |
Stack to Reach Ratio | 1.35:1 | 1.32:1 | 1.32:1 | 1.29:1 | 1.27:1 |
Seat Tube Length, Unknown | 385mm | 400mm | 400mm | 415mm | 430mm |
Top Tube Length, Effective/Horizontal HT Top | 582.5mm | 605.7mm | 605.9mm | 629.1mm | 652.4mm |
Head Tube Angle | 65deg | 65deg | 65.5deg | 65.5deg | 65.5deg |
Effective Seat Tube Angle, Unknown | 76.5deg | 76.5deg | 76.5deg | 76.5deg | 76.5deg |
Head Tube Length | 105mm | 120mm | 90mm | 105mm | 120mm |
Bottom Bracket Drop | 20mm | 20mm | 39mm | 39mm | 39mm |
Bottom Bracket Height | 333mm | 333mm | 333mm | 333mm | 333mm |
Chainstay Length | 425mm | 425mm | 430mm | 430mm | 430mm |
Chainstay Length Horizontal | 424.5mm | 424.5mm | 428.2mm | 428.2mm | 428.2mm |
Front-Center | 748.5mm | 774.8mm | 766.3mm | 792.4mm | 818.6mm |
Front-Center Horizontal | 748.3mm | 774.6mm | 765.3mm | 791.5mm | 817.7mm |
Wheelbase | 1172.8mm | 1199.1mm | 1193.5mm | 1219.7mm | 1245.9mm |
Fork Offset/Rake | 46mm | 46mm | 51mm | 51mm | 51mm |
Trail | 113.8mm very high | 113.8mm very high | 113.5mm very high | 113.5mm very high | 113.5mm very high |
Mechanical Trail | 103.2mm | 103.2mm | 103.3mm | 103.3mm | 103.3mm |
Wheel Flop | 43.6mm | 43.6mm | 42.8mm | 42.8mm | 42.8mm |
Standover Height | 666.6mm | 672.5mm | 676.6mm | 686.2mm | 695.9mm |
Tire to Pedal Spindle | 225.6mm 170 mm cranks | 251.9mm 170 mm cranks | 224.3mm 170 mm cranks | 245.5mm 175 mm cranks | 271.6mm 175 mm cranks |
Pedal Spindle to Ground Clearance | 163mm 170 mm cranks | 163mm 170 mm cranks | 163mm 170 mm cranks | 158mm 175 mm cranks | 158mm 175 mm cranks |
T7 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 | 2.4in | 2.4in | 2.4in | 2.4in | 2.4in |
Tire Width Max | 2.6in | 2.6in | 2.6in | 2.6in | 2.6in |
Tire Outer Diameter | 705.9mm | 705.9mm | 743.9mm | 743.9mm | 743.9mm |
Bike Length with Tires | 1878.7mm | 1905mm | 1937.4mm | 1963.6mm | 1989.8mm |
Crank Length | 170mm | 170mm | 170mm | 175mm | 175mm |
Handlebar Width | 780mm | 780mm | 780mm | 780mm | 780mm |
Stem Length | 35mm | 35mm | 35mm | 35mm | 35mm |
Published Sizing Recommendations
Height | 155 cm to 168 cm | 168 cm to 176 cm | 168 cm to 176 cm | 177 cm to 185 cm | 180 cm to 187 cm |
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.bicyclesonline.com.au/2021-polygon-siskiu-t7-dual-suspension-mountain-bi