Why buy your bike from Sigma Sports?
Don't hesitate to reach out to us. It's our goal to answer all of your questions and offer the best advice from our experts. We’ll be happy to answer any questions you may have. Contact us now or visit us in-store.
All our bikes are fully built by our Cytech qualified mechanics. To find out more, see the Built, Checked, Tuned and Tested section below to see how we'll deliver your bike.
We offer FREE DELIVERY of your bike to your home or place of work. Once you've placed your order, our Customer Care team will be in contact to offer a convenient delivery date of your choice.
We've partnered with Pedalsure to offer you 30-DAYS FREE bike insurance on new bikes over £400. Visit our Cycle Insurance page to learn more and claim.
Orbea Onna 50 Mountain Bike 2022
Ideal for a first foray into off-road riding or for use commuting, the Orbea Onna 50 Mountain Bike has front suspension, hydraulic disc brakes and trail-ready components.
Cables are routed internally through the alloy frame for quiet, low maintenance operation off-road whilst the rack and kickstand mounts will come in handy if the bike is used for city errands or commuting. A 100mm travel suspension helps with comfort and control on bumpy trails or potholed streets and the frame is dropper post ready for when it's time to venture onto more challenging terrain.
Wheel size is specific to the frame, with larger bikes getting 29” wheels and smaller sizes using 27.5” so that the ride experience and handling are consistent for every rider. The 2.35” Kenda tyres have sufficient volume to add extra comfort and grip off-road, but will still roll easily on tarmac thanks to their closely spaced lugs.
Nice to see at this pricepoint is the use of Shimano hydraulic disc brakes for great control and stopping power, with the 2x8-speed drivetrain offering a good range of gears that can cope with flat roads and hilly trails with equal ease.
Highlights
- Orbea Onna alloy frame with internal; cable routing, rack and kickstand mounts
- SR Suntour XCE 28 Coil 100mm fork
- Shimano hydraulic disc brakes
- 2x8-speed drivetrain
- Shimano hydraulic disc brakes
- Frame size specific wheel sizes
Technical Specification
| Frame | Orbea Onna alloy, dropout 9x135, BSA BB, internal cable routing |
| Fork | SR Suntour XCE 28 Coil 100mm QR |
| Headset | 1"-1/8 Semi-Integrated |
| Stem | Orbea Alloy 31.8mm interface 7º |
| Handlebar | Alloy Flat 31.8mm 720mm width |
| Front Brake | Shimano MT200 hydraulic disc |
| Rear Brake | Shimano MT200 hydraulic disc |
| Brake Levers | Shimano MT200 hydraulic disc |
| Front Derailleur | Shimano M315 31.8mm |
| Rear Derailleur | Shimano Tourney TX800 8-speed |
| Shift Levers | Microshift TS38 8-speed |
| Chain | KMC X8 |
| Cassette | SunRace CSM66 11-34t 8-speed |
| Crankset | Orbea alloy forged 22/36t |
| Front Wheel | Mach1 ER20 19c, 27.5” (Size XS and S), 29” (size S, M, L, XL) |
| Rear Wheel | Mach1 ER20 19c |
| Front Tyre | Kenda K1153 2.35" 22TPI clincher |
| Rear Tyre | Kenda K1153 2.35" 22TPI clincher |
| Saddle | Essax Adv soft135mm for Orbea |
| Seatpost | Orbea alloy 27.2mm, offset 0mm |
| Pedals | Available to be purchased separately |
Built, Checked, Tuned and Tested
All our bikes are fully built, checked, tuned and tested by our Cytech qualified mechanics and then securely packaged, ready for delivery. All you have to do is add the pedals (if included), attach the handlebars to the stem and tighten them following the included detailed instructions or by watching our video and using the provided FREE tools. Visit our Bike Assembly page to see how you assemble your new bike once you receive it.
All bikes collected from our shop, are built, tested and ready to ride.
Please note, occasionally, manufacturers may change the specification without notice. Bicycles do not come with pedals unless otherwise specified. Bikes ordered for delivery will not arrive with the pedals installed, please refer to the owners manual and pedal installation guides provided for guidance. We do not install accessories to bikes, including mudguards. Bikes ordered for delivery that have tubeless compatible tyres and rims will arrive with inner tubes installed or with tubeless valves installed, this will be brand dependent. Sealant is available to be purchased separately.
If you require any assistance please contact our Customer Care team.