2020 RSD Bikes Middlechild 27.5+ AL XL
Build
650B/27.5 in × 2.8 in
Insights
Somewhat aggressive stack and reach vs trend of hardtail all-mountain/enduro 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 | 489mm |
| Stack to Reach Ratio | 1.29:1 |
| Seat Tube Length, C-T | 490mm |
| Top Tube Length, Effective/Horizontal HT Top | 669mm |
| Top Tube Length, Actual C-C | 631mm |
| Top Tube Slope | 14.2deg |
| Head Tube Angle | 64.5deg |
| Seat Tube Angle | 74deg |
| Head Tube Length | 120mm |
| Bottom Bracket Drop | 43.1mm |
| Bottom Bracket Height | 320mm |
| Chainstay Length | 415mm |
| Chainstay Length Horizontal | 412.8mm |
| Front-Center | 819.4mm |
| Front-Center Horizontal | 818.3mm |
| Wheelbase | 1231mm |
| Fork Offset/Rake | 51mm |
| Fork Length, Unknown | 550mm |
| Trail | 116.7mm very high |
| Mechanical Trail | 105.3mm |
| Wheel Flop | 45.3mm |
| Standover Height | 717mm |
| Tire to Pedal Spindle Distance With 175 mm cranks | 281.3mm |
| Pedal Spindle to Ground Clearance With 175 mm cranks | 145mm |
27.5+ AL Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.8in |
| Tire Outer Diameter | 726.2mm |
| Bike Length with Tires | 1957.2mm |
| Crank Length | 175mm |
| Handlebar Width | 780mm |
| Stem Length | 50mm |
| Suspension Type | Hardtail (Front suspension) |
| Bar Type | Flat Bar |
| Fork Travel | 140mm |
| Suspension Sag | Unknown |
| Frame Material | Aluminum |
| Fork Material | Unknown |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 6 ft 1 in to 6 ft 5 in |
Source:https://rsdbikes.com/portfolio/middlechild-aluminum/