2021 Decathlon RockRider ST 540
- Category
- Hardtail Cross-country MTB
- Design
- Flat Bar, Hardtail (Front suspension)
- Frame
- Aluminum
- Suspension
- 100mm fork travel
- Features
- Disc brake
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 | 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 | 588mm | 607mm | 617mm | 635mm |
Reach | 375mm | 399mm | 426mm | 441mm |
Stack to Reach Ratio | 1.57:1 | 1.52:1 | 1.45:1 | 1.44:1 |
Seat Tube Length, Unknown | 421mm | 432mm | 443mm | 493mm |
Top Tube Length, Effective/Horizontal Center | 555mm | 585mm | 615mm | 635mm |
Top Tube Slope | 20.4deg | 20.3deg | 19.2deg | 15.6deg |
Head Tube Angle | 69.5deg | 69.5deg | 69.5deg | 69.5deg |
Seat Tube Angle | 73deg | 73deg | 73deg | 73deg |
Head Tube Length | 110mm | 130mm | 140mm | 160mm |
Bottom Bracket Drop | 43mm | 43mm | 43mm | 43mm |
Bottom Bracket Height | 306.2mm | 306.2mm | 306.2mm | 306.2mm |
Chainstay Length | 430mm | 430mm | 430mm | 430mm |
Chainstay Length Horizontal | 427.8mm | 427.8mm | 427.8mm | 427.8mm |
Front-Center | 627.6mm | 658.6mm | 689.5mm | 710.5mm |
Front-Center Horizontal | 626.2mm | 657.2mm | 688.2mm | 709.2mm |
Wheelbase | 1054mm | 1085mm | 1116mm | 1137mm |
Fork Offset/Rake | 42mm | 42mm | 42mm | 42mm |
Fork Length (On-Axis) | 496mm | 496mm | 496mm | 496mm |
Trail | 85.7mm very high | 85.7mm very high | 85.7mm very high | 85.7mm very high |
Mechanical Trail | 80.3mm | 80.3mm | 80.3mm | 80.3mm |
Wheel Flop | 28.1mm | 28.1mm | 28.1mm | 28.1mm |
Tire to Pedal Spindle | 108.5mm 170 mm cranks | 139.4mm 170 mm cranks | 170.4mm 170 mm cranks | 191.3mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 136.2mm 170 mm cranks | 136.2mm 170 mm cranks | 136.2mm 170 mm cranks | 136.2mm 170 mm cranks |
ST 540 Build
S | M | L | XL | |
Wheel Size | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD |
Tire Width | 2.25in | 2.25in | 2.25in | 2.25in |
Tire Outer Diameter | 698.3mm | 698.3mm | 698.3mm | 698.3mm |
Bike Length with Tires | 1752.3mm | 1783.3mm | 1814.3mm | 1835.3mm |
Handlebar Width | 640mm | 640mm | 680mm | 680mm |
Stem Length | 70mm | 70mm | 80mm | 90mm |
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
Hardtail Cross-country MTBSource:https://www.decathlon.fr/p/velo-vtt-st-540-27-5/_/R-p-301097?mc=8500756