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DEMA Energy 12 29 bike, black/silver
RRP 929 €
In-store pickup
From 08.06.2026 (Monday)
Check availability
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At MTBIKER Service Point
Available from 16.06.2026 (Tuesday)
By courier to your home
Delivery method on Friday 12.06.2026
Do you want to test the bike without any obligation?
Choose in-person pick-up at the store and decide on the spot.
Choose in-person pick-up at the store and decide on the spot.
Bike fitting discount 20 % (you will save 28 €)
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Extended return option up to 100 days More info
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In-person pick-up with free assembly
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Product description
Regular and longer rides
Product content
Size chart
How we ship bikes
Reviews
Product questions
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DEMA Energy 12 29 bicycle
Level and quality of equipmenthelp
Especially suitable for sporty enthusiasts who like to spend their time after work or on weekends on two wheels. Suitable for regular riding from cycle paths, field and forest roads to moderately demanding terrain. They are equipped with components that are the golden mean in the ratio of reliability and durability.
Aluminium frame
Lighter, relatively durable and stiff material that is affordable. The most widespread material for the production of bicycle frames.
Hydraulic disc brakes
Reliable in all conditions, better modulation of the braking effect with the use of less force on the lever. Heavier weight, more demanding service.
Air fork
The best option in terms of weight and comfort. Provides more adjustment options (rebound, compression). Requires regular service - the service cycle is specified by the manufacturer.
29” wheels
The advantage is better terrain passability, better rolling and traction. However, they are heavier, which also applies to tires.
Specification
| Frame |
DEMA Energy Boost Alloy
|
| Fork |
RockShox Judy 100 mm
|
| Shifting |
Shimano Deore 2x11
|
| Derailleur |
Shimano Deore RD-M4120 SGS
|
| Front derailleur |
Shimano FD-M5100 2x11
|
| Cassette |
Shimano Deore 11-42T
|
| Chain |
Shimano CN-HG601 11SPD
|
| Crankset |
Shimano FC-M5100-B2 36/26T 175 mm
|
| Brakes |
Shimano MT200
|
| Rims |
WTB ST i27 TCS 2.0 29" 32H
|
| Rear hub |
SHIMANO MT400
|
| Tires |
Michelin Country Grip 29x2.2"
|
| Seat post |
Extend Alloy 31.6 x 400 mm
|
| Saddle |
Selle Italia MODEL-X
|
| Stem |
Extend Race 80 mm -10°
|
| Handlebars |
Extend Race A6045BT Flat 740 mm
|
| Grips |
Extend Absorbic Silicone 130 mm
|
| Headset |
Extend H868P, 1 1/8" - 1,5" tappered
|
| Bottom bracket |
Shimano Mega EXO BB-MT500
|
info
If pedals are not listed in the bike's specifications, the bike is likely delivered without pedals.
Product details
| Sex | Men, Unisex |
| Model year | 2024 |
| Gears | 2x11 |
| Groupset | Shimano Deore |
| Size | M, L, XL |
| Colour | black/silver |
| Material | aluminium |
| Wheel material | Aluminium |
| Wheel diameter | 29" |
| Brakes | Hydraulic disc |
| Fork | Air |
| Fork travel | 100 mm |
| Dropper post | no |
| Control type | mechanical |
| product ID | 318838 |
| Bike size | M | L | XL |
|---|---|---|---|
| Height (cm) | 160 - 175 cm | 175 - 185 cm | > 185 cm |
All bicycles at the MTBIKER shop are new, not-ridden, from an official distributor and with a full warranty. Several brands even offer a lifetime warranty on the frame after registration. We perform all warranty services in MTBIKER stores after personal delivery or after sending the bike (or its part) by courier.
Our bike shipment is as follows:
- The bicycle is taken out of the manufacturer's box
- The bicycle is assembled, inspected and adjusted (front and rear derailleur, shock, fork, wheels,...)
- The bicycle is carefully packaged back into a box and shipped
- If you order a bike for in-person pick-up or home delivery, the bike will be waiting for you assembled and checked
- If you order a bicycle via courier to your home address, the following must be done at home:
- Take the bike out of the box and carefully remove safety material and foils
- Mount handlebar to stem (1 minute, 4 or 5 mm hex hey is needed).
- Mount front wheel to fork (1 minute, without the need of any tools if the bike has a quick release).
- Loosen the screws in the headset, straighten the stem with the front wheel, tighten the upper screw on the fork and then tighten the headset (2 minutes, 4 or 5 mm hex key is needed).
- Mount the pedals to the cranks while lubricating the thread and carefully mounting it the right way (1 minute, 8 mm hex key or 15 mm wrench).
- Mount seat post to frame (10 seconds, without needing any tools if the frame has a quick link).
- Inflate the tires or fork and shock to desired pressure (2 minutes, pump needed).
- Check the tightening of hex keys and quick-releases (2 minutes, 4 and 5 mm hex key is needed).
- Go for a test drive! Handle your bicycle carefully until you get used to it. If the bike has disc brakes, their performance will be limited from now on - they will gain their full power after 4-5 strong brakes at higher speed.
Auxiliary video for setting up the bike:
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Product questions
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Variant DEMA Energy 12 29 bicykel, black/silver
Dobry den nahodou L-kovy ram by sa nedal u vas objednat?mali ste ho este cez tyzden skladom na predajni v hradku.dakujem
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Dobrý deň,
Mrzí nás to ale veľkosť L je vypredaná a nevieme ju dodať.
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a dalo by sa to M ko co je posledny kus v kosiciach poslat na predajnu do hradku a vyskusat si ho?
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Dobrý deň,
Áno nie je problém. V prípade záujmu si prosím vytvorte objednávku s osobným odberom na predajni v Hrádku a bicykel na základe objednávky prevezieme. Ak nebude sedieť, nemusíte ho prevziať.
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DEMA is the first and oldest Slovak bicycle brand with more than 30 years of tradition continuously presented on the European market. DEMA has won many awards within the most recognized global brand evaluation program - Superbrands Award. DEMA offers a wide portfolio of bicycles from electric bicycles, through MTB, cross, or City bicycles to bicycles for our little ones. All with modern design and quality components.
All the answers to questions about delivery, payment, security, returns, warranty and much else.
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Why shop with us?
Find out what makes us special
1 500 000+ orders
We are the largest cycling e-shop in Slovakia, verified by 100,000+ customers.
Unique customer service
We are available via e-mail, online chat, phone or in person at our MTBIKER stores.
We actively support the cycling community in Slovakia
Thanks to your order we can support cycling development.
Secure payment methods
The payment process is safe and we offer you a wide range of options.
Loyalty program
We will reward you for your purchase and also for quality contributions in the MTBIKER forum, e-shop, trips and photo gallery.
MTBIKER centre and showroom
Visit our store with a pump-track and trail access or our showroom in a historical bulding in central Bratislava.
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Variant DEMA Energy 12 29 bicykel, black/silver
Bicykel hodnotím dobre jazdy sa výborne jediné čo je na biku vyslovene od výroby zle je reťaz. nemal som odjazdených ani 50km a bike nedokázal držať/ udržať prevod. zašiel som na pobočku kde nastavili doraz a trochu pomohlo ( asi na 15km ) zašiel som znova opätovne nastavenie a ďalších 10km a reťaz sa roztrhla .... opätovná návšteva na pobočke reťaz opravená ďalších ( podľa slov technika bola min. o 3-4 články dlhšia ako mala byt ) asi 100km okej . Dnes som nasadol na bike a opätovne neudržal prevod skontroloval som reťaz a jeden článok povolený ..... Nič treba určíte inú reťaz .... ale bike je super .
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Presne taky isty problem som mal aj ja s tym bicyklom z jednej strany to vobec nedrzalo ten nit ale spravil som si to sam skratil o jeden clanok nic sa nestalo a tiez podla mna je ta retaz dlha.ako co sa tyka biku ten je super zprevodovany urcite lepsie jak z jednym prevodnikom v predu za tie peniaze aj slusna vybava a hlavne pevne osi.
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Podobne. Priatelke sa roztrhla retaz po necelych 100 km
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