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 Alma M25 29" Mountain Bike 2021
With lightweight Orbea OMR carbon frame construction and race-focused geometry, the Orbea Alma M25 29" Mountain Bike provides the perfect platform for cross-country progression. Stiff and responsive, the frame resists twisting and delivers the power transfer needed to shave seconds off your personal bests. Thin seatstays provide natural, vibration dampening flex to enhance comfort over rough terrain. This flex reduces fatigue on longer rides to keep you feeling fresh in the saddle, perfect for riders chasing the podium.
The OMR composite material shaves 550 grams of the weight off the aluminium Alma, and utilises high strength fibres to improve the frames stiffness to weight ratio. Internal cable routing ensures a clean aesthetic and provides protected rattle-free performance. The cross-country geometry favours precision, yet retains comfort for long rides.
A FOX 32 SC fork delivers 100mm of smooth suspension travel for grip on technical terrain, with the Step Cast design reducing weight without impacting stiffness. The DT Swiss X-1900 wheelset is tubeless-ready, making it easy to reap the benefits of a tube-free setup and the Shimano XT 12-speed drivetrain sees a wide range of gear ratios, with the 10-51t cassette being an ideal choice for steep climbs. The Acros Block Lock headset prevents frame damage from bar and fork impacts by limiting the steering range, without affecting the bikes cornering performance.
- Orbea Monocoque OMR carbon construction
- Rattle-free internal cable routing
- Acros Block Lock headset
- FOX 32 Float SC Performance fork with lightweight Step Cast design and remote lockout
- Shimano XT 12-speed drivetrain, with 10-51t range
- Lightweight DT Swiss X-1900 wheelset for fast acceleration
- Fast-rolling 29" Maxxis Ikon 2.2” tyres
|Frame||Orbea Alma Carbon OMR, Boost 12x148, press fit bottom bracket, internal cable routing|
|Fork||FOX 32 Float SC Performance 100 Remote Push-Unlock QR15x110|
|Headset||Acros 1-1/8 - 1-1/2" Semi-integrated, with Block Lock|
|Stem||OC3 31.8mm diameter, 8-degrees|
|Handlebar||Orbea OC1 Flat, 31.8mm diameter, 740mm width|
|Front Brake||Shimano M6100, hydraulic disc|
|Rear Brake||Shimano M6100, hydraulic disc|
|Brake Levers||Shimano M6100, hydraulic disc|
|Rear Derailleur||Shimano XT M8100 SGS Shadow Plus, 12-speed|
|Shift Levers||Shimano XT M8100 I-Spec EV, 12-speed|
|Chain||Shimano M7100, 12-speed|
|Cassette||Shimano CS-M7100 10-51t, 12-speed|
|Crankset||Shimano XT M8100, 34t|
|Front Wheel||DT Swiss X-1900 Spline 25c, 29”, tubeless-ready|
|Rear Wheel||DT Swiss X-1900 Spline 25c, 29”, tubeless-ready|
|Front Tyre||Maxxis Ikon 2.20" FB 120 TPI 3C Exo TR, tubeless-ready, clincher|
|Rear Tyre||Maxxis Ikon 2.20" FB 120 TPI 3C Exo TR, tubeless-ready, clincher|
|Saddle||Fizik Taiga S-alloy rail|
|Seatpost||Orbea OC2 forge head 27.2|
|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 specified), 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. We do not install accessories to bikes, including mudguards.
Orbea Alma M25 29" Mountain Bike 2021 Sizing
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