Created for performance, its quality aluminum frame provides the perfect balance between comfort and lightness. This bike is ideal for taking on all gradients and distances
Developed by our team of women cyclists, this bike has been tested and approved by Elise Delzenne on the Tour des Flandres, Ardรฉchoise and รtape du Tour
How to choose the right size Ultra AF Women’s bike
Women from 4’11” – 5’5″: Size XS
Women from 5’3″ – 5’7″: Size S
Women from 5’6″ – 5’9″: Size M
Frame / fork
B’Twin Alur18 Alu6061 frame approved by the UCI.
Aluminum is an ideal choice for obtaining an excellent propulsion-to-comfort ratio. The variable thickness tubes considerably reduce the weight. The cables are built into the frame.
Frame weight: 3.1 lbs in size M.
B’Twin carbon fork and aluminum pivot
The combined use of carbon and aluminum: an ideal combination to obtain homogeneous behavior with the frame.
Fork weight: 1.2 lbs.
Handlebar / stem / steering
Compact B’Twin handlebars in 6061 aluminum
Width from axle to axle adapted to women’s shoulder width:
Bike size XS and S: 15″.
Bike size M: 15.75″
Handlebars weight: 10.5 oz in size 15″.
6061 aluminum stem
Bike size XS: 60 mm stem – 3.8 oz
Bike size S and M: 80 mm – 4.5 oz
Drivetrain
Shimano Tiagra 4700 10-speed drivetrain with levers adapted for better grip by women’s hands.
Shimano Tiagra 4700 double front derailleur.
Shimano Tiagra 4700 GS 10-speed rear derailleur.
Shimano Tiagra double compact bottom bracket.
Crankset / cassette
Shimano Tiagra 4700 50 X 34 bottom bracket.
Crank length varies according to the bike size:
XS / S: 6.5″.
M: 6.7″.
Shimano Tiagra 4700 10S 11 x 32 cassette.
(11,12,14,16,18,20,22,25,28,32).
Saddle / seat post
B’Twin woman sport saddle, chosen for its comfort and efficiency.
Weight: 8.5 oz.
B’Twin Competition aluminum seat post.
Diameter: 31.6 mm.
Length: 11.8″.
Weight: 9.4 oz.
Brakes
Direct Mount Tektro T531 F front brake
Tektro R540 rear brake
Wheels / Tires
Aero 700 2024 B’Twin wheels
Michelin Lithion Reinforced 2 tires
Weight
20.1 lbs in size S
Composition
Bike frame : 100.0% Aluminum
Guarantee
Lifetime warranty on the frame, 2 years on the fork, 2 years on peripheral components.
Anatomical design : Geometry adapted to women’s morphology thanks to the cycling position elements
Efficiency : Shimano Tiagra 10-speed drivetrain
Aero 700 B’Twin wheels
Cycling comfort : B’Twin Ultra Evo Vario aluminum frame, carbon fork, aluminum pivot.
Seat comfort : Specially designed women’s saddle for sport, designed by the women’s design team

























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