Orbea Onna 29 20 Mountain Bike 2026 - Hardtail MTB
The Orbea Onna 29 20 is a capable hardtail for getting into mountain biking, the Onna 29 20 combines balanced geometry, 29er wheels and reliable Shimano components to deliver confident handling and comfort on trails and tracks.
Key Features:
- Orbea Onna alloy frame, internal routing, balanced trail geometry
- RockShox Judy Silver TK fork, 100mm travel
- N/A
- Shimano Cues 1x11 drivetrain
- Shimano MT200 hydraulic disc brakes
- 29” wheels with Kenda Booster 2.4” tyres
- Wide tyre clearance for grip and comfort
- Available with 0% APR finance
The Orbea Onna 29 20 is designed as a solid starting point for riders looking to get into mountain biking or progress their off-road skills. Its alloy frame keeps things lightweight and durable, while internal cable routing helps maintain a clean look and reduces maintenance.
The geometry is set up to offer a balanced ride, giving a stable and predictable feel that helps build confidence on the trail. Combined with 29” wheels, it rolls smoothly over obstacles like roots and rocks, making it easier to maintain momentum on uneven terrain.
Up front, the RockShox Judy Silver TK fork with 100mm of travel helps absorb bumps and improve control, particularly on rougher trails. This makes the bike more comfortable and forgiving, especially for newer riders.
The Shimano Cues 1x11 drivetrain offers a wide gear range with simple operation, making it easy to find the right gear without overcomplicating shifting. Shimano hydraulic disc brakes provide consistent stopping power in all conditions, adding reassurance when riding off-road or in wet weather.
With wide 2.4” tyres, the Onna delivers plenty of grip and added comfort, helping riders feel more confident as they explore different terrain. Overall, it’s a well-rounded hardtail that focuses on ease of use, control and reliability, making it a great option for developing skills and enjoying time on the trails.
Occasionally, without notice, manufacturers change product design and/or specifications.
| Frame | Orbea Onna Alloy, Dropout 9x135, BSA BB, Internal cable routing |
| Fork | RockShox Judy Silver TK Crown adjust QR Solo Air 100 |
| Headset | 1"-1/2 Semi-Integrated |
| Stem | Alloy, 7º |
| Bars | Alloy, 31.8mm, Flat, 740mm, Sweep 9 |
| Front Brake | Shimano MT200 Hydraulic Disc |
| Rear Brake | Shimano MT200 Hydraulic Disc |
| Rear Mech | Shimano Cues U6000 GS Shadow |
| Shifters | Shimano Cues SL-U6000 |
| Speed | 11 |
| Rims | WH 2.1, Alloy, 29", 32H |
| Front Tyre | Kenda Booster 2.40" 30TPI |
| Rear Tyre | Kenda Booster 2.40" 30TPI |
| Seat Post | SP 0.6, Alloy, 27.2mm, Setback 0 |
| Saddle | Fortune QF-3091 |
| Chainset | Forged alloy, 32t |
| Chain | KMC eGlide |
| Cassette | Sun Race 11-50t 11-Speed |
| Pedals | VP-537 Black |
Mountain Bike Size Chart
|
Height
|
Bike Size
|
Mountain Bike Size
|
|
4’8” – 5’1”
143 – 155 cm
|
XXS
|
13” (33 cm)
|
|
5’1” – 5’4”
155 – 163 cm
|
XS
|
15” (38 cm)
|
|
5’4” – 5’7”
163 – 170 cm
|
S
|
16” (41 cm)
|
|
5’7” – 5’10”
170 – 178 cm
|
M
|
18” (46cm)
|
|
5’10” – 6’0”
178 – 183 cm
|
L
|
19” (48cm)
|
|
6’0” – 6’3”
183 – 191 cm
|
XL
|
20” (51 cm)
|
|
6’3” – 6’5”
191 – 196 cm
|
XXL
|
21” (53 cm)
|
|
6’5” – 6’9”
196 – 205 cm
|
XXXL
|
22” (56 cm)
|
* Mountain bikes are sized differently to road bikes. Typically, they are sized in inches as the first MTBs were produced in the USA. European brands like Lapierre and Haibike like to use centimetres for all their bikes. The measurements of their mountain bikes doesn’t match their road bikes but are like a simple conversion from the inches measurement. This is why we have included cm measurements in brackets for the Mountain bike column.
Read our bike size guide for more information on sizing.
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