2026 Polygon bikes Siskiu T7 XL
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
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Geometry
| Stack | 636mm |
| Reach | 505mm |
| Stack to Reach Ratio | 1.26:1 |
| Seat Tube Length, C-T | 430mm |
| Top Tube Length, Effective/Horizontal Center | 644mm |
| Head Tube Angle | 64.5deg |
| Effective Seat Tube Angle, ETT HT Top | 77deg |
| Seat Tube Exit Angle | 71.2deg |
| Head Tube Length | 125mm |
| Bottom Bracket Drop | 39mm |
| Bottom Bracket Height | 333mm |
| Chainstay Length | 430mm |
| Chainstay Length Horizontal | 428.2mm |
| Front-Center | 839.7mm |
| Front-Center Horizontal | 838.8mm |
| Wheelbase | 1267mm |
| Fork Offset/Rake | 44.2mm |
| Trail | 128.4mm very high |
| Mechanical Trail | 115.9mm |
| Wheel Flop | 49.9mm |
| Standover Height | 722mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 297.7mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 163mm |
T7 Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 2.4in |
| Tire Outer Diameter | 743.9mm |
| Bike Length with Tires | 2010.9mm |
| 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 | 185 cm to 195 cm |
Source:https://www.polygonbikes.com/siskiu-t7-with-udh-2026/