2020 RSD Bikes Middlechild 27.5+ AL
- Category
- Hardtail All-mountain/Enduro MTB
- Design
- Flat Bar, Hardtail (Front suspension)
- Frame
- Aluminum
- Suspension
- 140mm 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 | 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 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 | 2.8in | 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 ScaleCategory Trend
Hardtail All-mountain/Enduro MTBSource:https://rsdbikes.com/portfolio/middlechild-aluminum/