2021 Decathlon RockRider ST 900 X Large

Build

650B/27.5 in × 2.1 in

Insights

Average stack and reach vs trend of hardtail trail mtb bikes
Suspension sag unknown
Geometry may mis-represent actual riding geometry

Stack and Reach vs. Category Trend
View all sizes

Geometry

Stack
629mm
Reach
446mm
Stack to Reach Ratio
1.41:1
Seat Tube Length, Unknown
493mm
Top Tube Length, Effective/Horizontal Unknown
638mm
Top Tube Slope
15deg
Head Tube Angle
69.5deg
Seat Tube Angle
73deg
Head Tube Length
144mm
Bottom Bracket Drop
43mm
Bottom Bracket Height
302.3mm
Chainstay Length Horizontal
430mm
Front-Center
713.3mm
Front-Center Horizontal
712mm
Wheelbase
1142mm
Fork Offset/Rake
44mm
Trail
82.1mm
very high
Mechanical Trail
76.9mm
Wheel Flop
27mm
Tire to Pedal Spindle Distance
With 170 mm cranks
198mm
Pedal Spindle to Ground Clearance
With 170 mm cranks
132.3mm

ST 900 Build

Wheel Size
650B, 27.5 inch (584mm BSD)
Tire Width
2.1in
Tire Outer Diameter
690.7mm
Bike Length with Tires
1832.7mm
Handlebar Width
720mm
Stem Length
90mm
Suspension Type
Hardtail (Front suspension)
Bar Type
Flat Bar
Fork Travel
120mm
Suspension Sag
Unknown
Frame Material
Aluminum
Fork Material
Steel
Brake Type
Unknown

Published Sizing Recommendations

Height
185 cm
to
200 cm
Source:https://www.decathlon.it/p/mtb-st-900-27-5/_/R-p-301098?mc=8500763&c=GRIGIO