2020 RSD Bikes Middlechild 27.5+ AL

Design
Flat Bar, Hardtail (Front suspension)
Frame
Aluminum
Suspension
140mm fork travel
Features
Disc brake
Somewhat aggressive stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Somewhat aggressive stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Somewhat aggressive stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Somewhat aggressive stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry

Geometry

Small
Medium
Large
XL
Stack
610mm
619mm
619mm
629mm
Reach
411mm
448mm
465mm
489mm
Stack to Reach Ratio
1.48:1
1.38:1
1.33:1
1.29:1
Seat Tube Length, C-T
410mm
450mm
470mm
490mm
Top Tube Length, Effective/Horizontal HT Top
586mm
625mm
642mm
669mm
Top Tube Length, Actual C-C
550mm
586mm
604mm
631mm
Top Tube Slope
22.4deg
18.1deg
15.7deg
14.2deg
Head Tube Angle
64.5deg
64.5deg
64.5deg
64.5deg
Seat Tube Angle
74deg
74deg
74deg
74deg
Head Tube Length
100mm
110mm
110mm
120mm
Bottom Bracket Drop
43.1mm
43.1mm
43.1mm
43.1mm
Bottom Bracket Height
320mm
320mm
320mm
320mm
Chainstay Length
415mm
415mm
415mm
415mm
Chainstay Length Horizontal
412.8mm
412.8mm
412.8mm
412.8mm
Front-Center
757.5mm
774.5mm
791.4mm
819.4mm
Front-Center Horizontal
756.3mm
773.3mm
790.3mm
818.3mm
Wheelbase
1169mm
1186mm
1203mm
1231mm
Fork Offset/Rake
51mm
51mm
51mm
51mm
Fork Length, Unknown
550mm
550mm
550mm
550mm
Trail
116.7mm
very high
116.7mm
very high
116.7mm
very high
116.7mm
very high
Mechanical Trail
105.3mm
105.3mm
105.3mm
105.3mm
Wheel Flop
45.3mm
45.3mm
45.3mm
45.3mm
Standover Height
695mm
710mm
714mm
717mm
Tire to Pedal Spindle
219.4mm
175 mm cranks
236.3mm
175 mm cranks
253.3mm
175 mm cranks
281.3mm
175 mm cranks
Pedal Spindle to Ground Clearance
145mm
175 mm cranks
145mm
175 mm cranks
145mm
175 mm cranks
145mm
175 mm cranks

27.5+ AL Build

Small
Medium
Large
XL
Wheel Size
650B/27.5
584 mm BSD
650B/27.5
584 mm BSD
650B/27.5
584 mm BSD
650B/27.5
584 mm BSD
Tire Width
2.8in
2.8in
2.8in
2.8in
Tire Outer Diameter
726.2mm
726.2mm
726.2mm
726.2mm
Bike Length with Tires
1895.2mm
1912.2mm
1929.2mm
1957.2mm
Crank Length
175mm
175mm
175mm
175mm
Handlebar Width
780mm
780mm
780mm
780mm
Stem Length
50mm
50mm
50mm
50mm

Published Sizing Recommendations

Height
5 ft 2 in
to
5 ft 7 in
5 ft 7 in
to
5 ft 10 in
5 ft 10 in
to
6 ft 1 in
6 ft 1 in
to
6 ft 5 in

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://rsdbikes.com/portfolio/middlechild-aluminum/