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Carbon frame and Shimano 105 drivetrain.

Reference : 8339667

Ultra 900 CF Carbon Road Bike - 105

Designed for regular training, club rides and sportives. This UCI approved carbon road bike comes kitted out with with the superb 11s shimano 105 5800 groupset and mavic aksium wheels. 100% designed & produced by b'Twin and exclusively available at Decathlon, the Ultra frame delivers stunning performance and comfort for even the most demanding of riders. A genuine pleasure to ride fast on the flat or down hill however this frame however really comes into its own on the climbs thanks to the low weight and superb power transfer. Road Bike Size Guide click here

To view our full range visit our Road Bikes category.

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B'Twin Ultra Evo Dynamic frame is the most advanced frame available to tackle mountains and win the most demanding classic races.
Weight: 850 g in size M (without accessories).
A blend of HM and IM carbon fibres for one of the best weight-to-speed ratios on the market.
The frame was specially designed for the most demanding climbers and sprinters. The bottom bracket is a standard PressFit 86 for greater stiffness of the chassis.


B'Twin Ultra Evo Dynamic fork, exclusive to the B'Twin Ultra Evo Dynamic frame.
Weight: 320 g.
Full carbon fork.

Handlebar / stem / steering

DEDA ZERO 2 6061 T6 aluminium compact handlebar.
Weight: 320 g in size 420 mm.
XS, S: 400 mm.
M, L: 420 mm.
XL: 440 mm.

DEDA ZERO 2 6061 T6 aluminium stem.
XS: 90 mm.
S: 100 mm.
M: 110 mm.
L: 120 mm.
XL: 130 mm.

Drive train

Shimano 105 direct mount front brake.
Symmetrical dual pivot design for more controlled and powerful braking. Adjustable spring tension on the front calliper.

Crankset / cassette

Shimano 105 11-speed ultra-versatile, 11x28 cassette.
11 ; 12 ; 13 ; 14 ; 15 ; 17 ; 19 ; 21 ; 23 ; 25 ; 28.

Crankset: Shimano 105 5800, 52x36.

KMC X11 chain.


Shimano 105 direct mount brakes.
Symmetrical dual pivot design for more controlled and powerful braking. Adjustable spring tension on the front calliper.


Mavic Aksium One wheels.
Material: S6000 aluminium.
Height: 21 mm.
Front weight without tyre: 845 g
Rear weight without tyre: 980 g.

20 in the front and the rear.
Sealed cartridge bearings.


Mavic Yksion 700x25 tyres

Saddle / Seat post

Fizik Antares Special Edition saddle.
Construction: Wing Flex.
Shell: nylon/reinforced carbon.
Rails: Manganese.
Microtex cover.
Weight: 210 g.
Dimensions: 275 x 142 mm.


Pedals not included.


7.8 kg in size M without pedals.

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100.00% Carbon fiber (CF)
Care instructions: IMPORTANT: Use the special carbon grease provided in the accessories bag when mounting the seat post. Tighten to recommended tightening torque (between 4 to 6 N/M) Do not clean bike with a high-pressure jet. Regularly degrease and grease your drivetrain to extend its lifespan. (We recommend using our All-in-One cleaning product, sold exclusively in Decathlon stores.)
Stock advice Store your bike in a dry, cool place.


The U19 racing team: This team uses this frame during races such as the Liège-Bastogne-Liège or the Classique des Alpes. Check out their latest news at: Used and tested by our product development partners: Eric LEBLACHER, Nicolas FRITSCH and Jean Christophe PERAUD
Guarantee : 5 years on the frame and 2 years on parts.