2020 Rockrider ST 900 s Base

Design
Flat Bar, Full suspension
Frame
Aluminum
Fork
Aluminum
Suspension
120mm fork travel, 120mm rear 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

Geometry

Medium
Large
X Large
Stack
596mm
605mm
619mm
Reach
403mm
430mm
446mm
Stack to Reach Ratio
1.48:1
1.41:1
1.39:1
Seat Tube Length, Unknown
443mm
443mm
493mm
Top Tube Length, Effective/Horizontal Unknown
585mm
615mm
635mm
Top Tube Slope
17.9deg
18deg
14deg
Head Tube Angle
68.5deg
68.5deg
68.5deg
Seat Tube Angle
73deg
73deg
73deg
Head Tube Length
130mm
140mm
155mm
Bottom Bracket Drop
15mm
15mm
15mm
Bottom Bracket Height
330.3mm
330.3mm
330.3mm
Chainstay Length Horizontal
436mm
436mm
436mm
Front-Center
677.2mm
708.2mm
729.2mm
Front-Center Horizontal
677mm
708mm
729mm
Wheelbase
1113mm
1144mm
1165mm
Fork Offset/Rake
42mm
42mm
42mm
Trail
90.9mm
very high
90.9mm
very high
90.9mm
very high
Mechanical Trail
84.6mm
84.6mm
84.6mm
Wheel Flop
31mm
31mm
31mm
Tire to Pedal Spindle
161.8mm
170 mm cranks
192.8mm
170 mm cranks
213.8mm
170 mm cranks
Pedal Spindle to Ground Clearance
160.3mm
170 mm cranks
160.3mm
170 mm cranks
160.3mm
170 mm cranks

Base Build

Medium
Large
X Large
Wheel Size
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
Tire Width
2.1in
2.1in
2.1in
Tire Outer Diameter
690.7mm
690.7mm
690.7mm
Bike Length with Tires
1803.7mm
1834.7mm
1855.7mm
Handlebar Width
660mm
680mm
680mm
Stem Length
80mm
80mm
90mm

Published Sizing Recommendations

Height
165 cm
to
174 cm
175 cm
to
184 cm
185 cm
to
200 cm

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 Scale
Source:https://www.decathlon.it/p/mtb-st-900-s-grigio-giallo-27-5/_/R-p-301099?mc=8500764&c=GRIGIO