2026 Polygon Bikes Siskiu T8
- Category
- Full-suspension Trail MTB
- Design
- Flat Bar, Full suspension
- Frame
- Aluminum
- Fork
- Aluminum
- Suspension
- 140mm fork travel, 140mm rear travel
- Features
- Disc brake
Average 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 | M | L | XL | |
Stack | 604mm | 609mm | 622mm | 636mm |
Reach | 440mm | 465mm | 485mm | 505mm |
Stack to Reach Ratio | 1.37:1 | 1.31:1 | 1.28:1 | 1.26:1 |
Seat Tube Length, C-T | 390mm | 400mm | 415mm | 430mm |
Top Tube Length, Effective/Horizontal Center | 568mm | 595mm | 619mm | 644mm |
Head Tube Angle | 64.5deg | 64.5deg | 64.5deg | 64.5deg |
Effective Seat Tube Angle, Unknown | 77deg | 77deg | 77deg | 77deg |
Seat Tube Exit Angle | 71.2deg | 71.2deg | 71.2deg | 71.2deg |
Head Tube Length | 90mm | 95mm | 110mm | 125mm |
Bottom Bracket Drop | 39mm | 39mm | 39mm | 39mm |
Bottom Bracket Height | 333mm | 333mm | 333mm | 333mm |
Chainstay Length | 430mm | 430mm | 430mm | 430mm |
Chainstay Length Horizontal | 428.2mm | 428.2mm | 428.2mm | 428.2mm |
Front-Center | 758.8mm | 786.7mm | 812.7mm | 839.7mm |
Front-Center Horizontal | 757.8mm | 785.8mm | 811.8mm | 838.8mm |
Wheelbase | 1186mm | 1214mm | 1240mm | 1267mm |
Fork Offset/Rake | 43.6mm | 44.1mm | 44mm | 44.2mm |
Trail | 129.1mm very high | 128.5mm very high | 128.7mm very high | 128.4mm very high |
Mechanical Trail | 116.6mm | 116mm | 116.2mm | 115.9mm |
Wheel Flop | 50.2mm | 49.9mm | 50mm | 49.9mm |
Standover Height | 704mm | 705mm | 713mm | 722mm |
Tire to Pedal Spindle | 216.8mm 170 mm cranks | 244.8mm 170 mm cranks | 270.8mm 170 mm cranks | 297.7mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 163mm 170 mm cranks | 163mm 170 mm cranks | 163mm 170 mm cranks | 163mm 170 mm cranks |
T8 Build
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 |
Tire Width | 2.4in | 2.4in | 2.4in | 2.4in |
Tire Outer Diameter | 743.9mm | 743.9mm | 743.9mm | 743.9mm |
Bike Length with Tires | 1929.9mm | 1957.9mm | 1983.9mm | 2010.9mm |
Handlebar Width | 780mm | 780mm | 780mm | 780mm |
Stem Length | 35mm | 35mm | 35mm | 35mm |
Stem Angle | 0deg | 0deg | 0deg | 0deg |
Published Sizing Recommendations
Height | 155 cm to 165 cm | 165 cm to 175 cm | 175 cm to 185 cm | 185 cm to 195 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.polygonbikes.com/siskiu-t8-with-udh-2026/