2026 Polygon Bikes Siskiu T8 S
Build
700C/29 in × 2.4 in
Insights
Average stack and reach vs trend of full-suspension trail mtb bikes
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 604mm |
| Reach | 440mm |
| Stack to Reach Ratio | 1.37:1 |
| Seat Tube Length, C-T | 390mm |
| Top Tube Length, Effective/Horizontal Center | 568mm |
| Head Tube Angle | 64.5deg |
| Effective Seat Tube Angle, Unknown | 77deg |
| Seat Tube Exit Angle | 71.2deg |
| Head Tube Length | 90mm |
| Bottom Bracket Drop | 39mm |
| Bottom Bracket Height | 333mm |
| Chainstay Length | 430mm |
| Chainstay Length Horizontal | 428.2mm |
| Front-Center | 758.8mm |
| Front-Center Horizontal | 757.8mm |
| Wheelbase | 1186mm |
| Fork Offset/Rake | 43.6mm |
| Trail | 129.1mm very high |
| Mechanical Trail | 116.6mm |
| Wheel Flop | 50.2mm |
| Standover Height | 704mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 216.8mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 163mm |
T8 Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 2.4in |
| Tire Outer Diameter | 743.9mm |
| Bike Length with Tires | 1929.9mm |
| Handlebar Width | 780mm |
| Stem Length | 35mm |
| Stem Angle | 0deg |
| Suspension Type | Full suspension |
| Bar Type | Flat Bar |
| Fork Travel | 140mm |
| Rear Travel | 140mm |
| Suspension Sag | Unknown |
| Frame Material | Aluminum |
| Fork Material | Aluminum |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 155 cm to 165 cm |
Source:https://www.polygonbikes.com/siskiu-t8-with-udh-2026/