2021 Decathlon RockRider ST 120 L
Build
650B/27.5 in × 2 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
View all sizes
Geometry
| Stack | 615mm |
| Reach | 429mm |
| Stack to Reach Ratio | 1.43:1 |
| Seat Tube Length, Unknown | 417mm |
| Top Tube Length, Effective/Horizontal Unknown | 616.6mm |
| Top Tube Slope | 21.4deg |
| Head Tube Angle | 69.5deg |
| Seat Tube Angle | 73deg |
| Head Tube Length | 140mm |
| Bottom Bracket Drop | 43mm |
| Bottom Bracket Height | 299.8mm |
| Chainstay Length | 430mm |
| Chainstay Length Horizontal | 427.8mm |
| Front-Center | 688.5mm |
| Front-Center Horizontal | 687.2mm |
| Wheelbase | 1115mm |
| Fork Offset/Rake | 40mm |
| Fork Length, Unknown | 474mm |
| Trail | 85.5mm very high |
| Mechanical Trail | 80.1mm |
| Wheel Flop | 28mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 175.7mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 129.8mm |
ST 120 Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2in |
| Tire Outer Diameter | 685.6mm |
| Bike Length with Tires | 1800.6mm |
| Handlebar Width | 640mm |
| Stem Length | 90mm |
| Stem Angle | 10deg |
| Suspension Type | Hardtail (Front suspension) |
| Bar Type | Flat Bar |
| Fork Travel | 80mm |
| Suspension Sag | Unknown |
| Frame Material | Aluminum |
| Fork Material | Unknown |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 175 cm to 184 cm |
Source:https://www.decathlon.it/p/mtb-rockrider-st-120-nero-azzurro-27-5/_/R-p-305496