2021 Decathlon RockRider ST 900 S XL
Build
650B/27.5 in × 2.2 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 | 619mm |
| Reach | 446mm |
| Stack to Reach Ratio | 1.39:1 |
| Seat Tube Length, Unknown | 493mm |
| Top Tube Length, Effective/Horizontal Unknown | 635mm |
| Top Tube Slope | 14deg |
| Head Tube Angle | 68.5deg |
| Seat Tube Angle | 73deg |
| Head Tube Length | 155mm |
| Bottom Bracket Drop | 15mm |
| Bottom Bracket Height | 332.9mm |
| Chainstay Length Horizontal | 436mm |
| Front-Center | 729.2mm |
| Front-Center Horizontal | 729mm |
| Wheelbase | 1165mm |
| Fork Offset/Rake | 42mm |
| Fork Length, Unknown | 508mm |
| Trail | 91.9mm very high |
| Mechanical Trail | 85.5mm |
| Wheel Flop | 31.3mm |
| Tire to Pedal Spindle Distance With 175 mm cranks | 206.3mm |
| Pedal Spindle to Ground Clearance With 175 mm cranks | 157.9mm |
ST 900 S Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.2in |
| Tire Outer Diameter | 695.8mm |
| Bike Length with Tires | 1860.8mm |
| Crank Length | 175mm |
| Handlebar Width | 720mm |
| Stem Length | 90mm |
| Suspension Type | Full suspension |
| Bar Type | Flat Bar |
| Fork Travel | 120mm |
| Rear Travel | 120mm |
| Suspension Sag | Unknown |
| Frame Material | Aluminum |
| Fork Material | Steel |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 185 cm to 200 cm |
Source:https://www.decathlon.it/p/mtb-st-900-s-grigio-giallo-27-5/_/R-p-301099?mc=8500764&c=GRIGIO