2021 Decathlon RockRider ST 540 M
Build
650B/27.5 in × 2.25 in
Insights
Average stack and reach vs trend of hardtail cross-country mtb bikes
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Stack and Reach vs. Category Trend
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Geometry
| Stack | 607mm |
| Reach | 399mm |
| Stack to Reach Ratio | 1.52:1 |
| Seat Tube Length, Unknown | 432mm |
| Top Tube Length, Effective/Horizontal Center | 585mm |
| Top Tube Slope | 20.3deg |
| Head Tube Angle | 69.5deg |
| Seat Tube Angle | 73deg |
| Head Tube Length | 130mm |
| Bottom Bracket Drop | 43mm |
| Bottom Bracket Height | 306.2mm |
| Chainstay Length | 430mm |
| Chainstay Length Horizontal | 427.8mm |
| Front-Center | 658.6mm |
| Front-Center Horizontal | 657.2mm |
| Wheelbase | 1085mm |
| Fork Offset/Rake | 42mm |
| Fork Length (On-Axis) | 496mm |
| Trail | 85.7mm very high |
| Mechanical Trail | 80.3mm |
| Wheel Flop | 28.1mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 139.4mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 136.2mm |
ST 540 Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.25in |
| Tire Outer Diameter | 698.3mm |
| Bike Length with Tires | 1783.3mm |
| Handlebar Width | 640mm |
| Stem Length | 70mm |
| Suspension Type | Hardtail (Front suspension) |
| Bar Type | Flat Bar |
| Fork Travel | 100mm |
| Suspension Sag | Unknown |
| Frame Material | Aluminum |
| Fork Material | Unknown |
| Brake Type | Disc |
Source:https://www.decathlon.fr/p/velo-vtt-st-540-27-5/_/R-p-301097?mc=8500756