2026 Orbea Onna 20 Base XS-27.5
Build
650B/27.5 in × 2.4 in
Insights
Average stack and reach vs trend of hardtail cross-country mtb bikes
Design deviates from other sizes of Orbea Onna 20
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 582mm |
| Reach | 365mm |
| Stack to Reach Ratio | 1.59:1 |
| Seat Tube Length, C-T | 350mm |
| Top Tube Length, Effective/Horizontal Center | 526mm |
| Top Tube Slope | 28.1deg |
| Head Tube Angle | 68.5deg |
| Seat Tube Angle | 74.5deg |
| Head Tube Length | 95mm |
| Bottom Bracket Drop | 41mm |
| Bottom Bracket Height | 312mm |
| Chainstay Length | 430mm |
| Chainstay Length Horizontal | 428mm |
| Front-Center | 622.3mm |
| Front-Center Horizontal | 621mm |
| Wheelbase | 1049mm |
| Fork Offset/Rake | 42mm |
| Fork Length (Axle-To-Crown) | 498.9mm |
| Trail | 93.9mm very high |
| Mechanical Trail | 87.4mm |
| Wheel Flop | 32mm |
| Standover Height | 668mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 99.3mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 142mm |
Base Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.4in |
| Tire Outer Diameter | 705.9mm |
| Bike Length with Tires | 1754.9mm |
| Handlebar Width | 740mm |
| Stem Length | 60mm |
| Stem Angle | -7deg |
| Suspension Type | Hardtail (Front suspension) |
| Bar Type | Flat Bar |
| Fork Travel | Unknown |
| Suspension Sag | 20% |
| Frame Material | Aluminum |
| Fork Material | Unknown |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 145 cm to 160 cm |
Source:https://www.orbea.com/en-se/onna-20