2026 Orbea Onna 20 Base
- Category
- Hardtail Cross-country MTB
- Design
- Flat Bar, Hardtail (Front suspension)
- Frame
- Aluminum
- Suspension
- 20% sag
- 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 upright 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 | Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry |
Geometry
XS-27.5 | S-27.5 | S-29 | M-29 | L-29 | XL-29 | |
Stack | 582mm | 591mm | 617mm | 617mm | 627mm | 641mm |
Reach | 365mm | 385mm | 390mm | 418mm | 440mm | 468mm |
Stack to Reach Ratio | 1.59:1 | 1.54:1 | 1.58:1 | 1.48:1 | 1.43:1 | 1.37:1 |
Seat Tube Length, C-T | 350mm | 388mm | 388mm | 430mm | 470mm | 540mm |
Top Tube Length, Effective/Horizontal Center | 526mm | 549mm | 561mm | 589mm | 614mm | 646mm |
Top Tube Slope | 28.1deg | 24deg | 26.2deg | 20.8deg | 17.1deg | 11.2deg |
Head Tube Angle | 68.5deg | 68.5deg | 68.5deg | 68.5deg | 68.5deg | 68.5deg |
Seat Tube Angle | 74.5deg | 74.5deg | 74.5deg | 74.5deg | 74.5deg | 74.5deg |
Head Tube Length | 95mm | 105mm | 95mm | 95mm | 105mm | 120mm |
Bottom Bracket Drop | 41mm | 41mm | 63mm | 63mm | 63mm | 63mm |
Bottom Bracket Height | 312mm | 312mm | 309mm | 309mm | 309mm | 309mm |
Chainstay Length | 430mm | 430mm | 440mm | 440mm | 440mm | 440mm |
Chainstay Length Horizontal | 428mm | 428mm | 435.5mm | 435.5mm | 435.5mm | 435.5mm |
Front-Center | 622.3mm | 646.3mm | 660.5mm | 688.4mm | 713.3mm | 747.2mm |
Front-Center Horizontal | 621mm | 645mm | 657.5mm | 685.5mm | 710.5mm | 744.5mm |
Wheelbase | 1049mm | 1073mm | 1093mm | 1121mm | 1146mm | 1180mm |
Fork Offset/Rake | 42mm | 42mm | 46mm | 46mm | 46mm | 46mm |
Fork Length (Axle-To-Crown) | 498.9mm | 498.9mm | 517.9mm | 517.9mm | 517.9mm | 517.9mm |
Trail | 93.9mm very high | 93.9mm very high | 97.1mm very high | 97.1mm very high | 97.1mm very high | 97.1mm very high |
Mechanical Trail | 87.4mm | 87.4mm | 90.3mm | 90.3mm | 90.3mm | 90.3mm |
Wheel Flop | 32mm | 32mm | 33.1mm | 33.1mm | 33.1mm | 33.1mm |
Standover Height | 668mm | 705mm | 705mm | 739mm | 770mm | 826mm |
Tire to Pedal Spindle | 99.3mm 170 mm cranks | 123.3mm 170 mm cranks | 118.6mm 170 mm cranks | 146.5mm 170 mm cranks | 171.4mm 170 mm cranks | 205.2mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 142mm 170 mm cranks | 142mm 170 mm cranks | 139mm 170 mm cranks | 139mm 170 mm cranks | 139mm 170 mm cranks | 139mm 170 mm cranks |
Base Build
XS-27.5 | S-27.5 | S-29 | M-29 | L-29 | XL-29 | |
Wheel Size | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 2.4in | 2.4in | 2.4in | 2.4in | 2.4in | 2.4in |
Tire Outer Diameter | 705.9mm | 705.9mm | 743.9mm | 743.9mm | 743.9mm | 743.9mm |
Bike Length with Tires | 1754.9mm | 1778.9mm | 1836.9mm | 1864.9mm | 1889.9mm | 1923.9mm |
Handlebar Width | 740mm | 740mm | 740mm | 740mm | 740mm | 740mm |
Stem Length | 60mm | 60mm | 60mm | 60mm | 60mm | 60mm |
Stem Angle | -7deg | -7deg | -7deg | -7deg | -7deg | -7deg |
Published Sizing Recommendations
Height | 145 cm to 160 cm | 155 cm to 170 cm | 155 cm to 170 cm | 165 cm to 180 cm | 175 cm to 190 cm | 185 cm to 195 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 ScaleCategory Trend
Hardtail Cross-country MTBSource:https://www.orbea.com/en-se/onna-20