"Designed for Replaces the highly acclaimed Alur 700. Upgraded with Shimano's 11s 105 groupset & R500 crankset and 25mm tyres. This unique triple butted UCI approved racing frame with a lifetime warranty remains at it's heart with full internal cable routing, ESR ready, powerful direct mount brakes and carbon forks really sets this bike apart. "

Our new B'TWIN ULTRA frame is derived from the Evo Vario concept. Aluminium is an ideal choice for obtaining an excellent propulsion-to-comfort ratio. The variable thickness tubes considerably reduce the weight and ensure excellent performance on all surfaces, even very rough terrain. The design is aerodynamic, the cabling is integrated into the frame and the rear brake is positioned under the chainstays.
This frame is UCI-approved.
Weight: 1400 g in size M.
FORK/SUSPENSION
Our new B'Twin Ultra Evo Vario fork is used exclusively on the B'Twin Ultra Evo Vario frame.The combination of carbon and aluminium is the ideal choice for perfect synergy between the B'Twin Ultra Evo Vario frame and fork.We have achieved a damping effect on very uneven and bumpy terrain such as paving and cobblestones. Aerodynamic design with brake located as close as possible to the fork.
Weight: 550 g in size L.
DRIVETRAIN
Shimano 105 11-speed drive train.Shimano 105 SS double front derailleur.
Shimano 11-speed rear derailleur.
Shimano RS 500 chainset.
CRANKSET / CASSETTE
Shimano RS 500 50x34 chainset.
Crank length varies according to size of bike: XS, S: 170 mm / M: 172.5 mm / L, XL: 175 mm.SHIMANO 105 11S 11 x 28.
11/12/13/14/15/17/19/21/23/25/28.
BRAKES
Shimano 105 direct mount brakes (fork and chainstay): their double pivot technology offers precision and power. Centring is always perfect with DPB technology, and they are made from cast aluminium and covered with a powder coating that withstands frequent washing.
HANDLEBAR / STEM / STEERING
Compact B'Twin 6061-T6 aluminium handlebar is scaled to the bike size. The compact shape is becoming increasingly common in the peleton, as it allows you to keep your hands low on the handlebars without compromising comfort. The handlebar weighs 320 g in size 420 mm. The stem is also made out of 6061-T6 aluminium. Scaled to the size of the bike. Weighs 140 g in size 110 mm. The steering uses long-life, sealed bearings, with a 1⅛" diameter at the top and 1¼" at the bottom.
WHEELS
The wheels were developed by B'TWIN's engineering office. This pair of wheels is designed for all-terrain use, with 20 spokes at the front and 24 at the rear. The rim is 28 mm high. Very versatile profile and hubs fitted with long-life cartridge bearings.
Weight: 1.790 kg per pair.
This wheel is used by the B'TWIN U19 RACING team in training and competition.
TYRES
Hutchinson Equinox 25 C for higher performance and added comfort.
SADDLE / SEAT POST
B'TWIN Comp Ergo Chromo saddle: chosen for its comfort and efficiency. Weight: 257 g.
B'TWIN Competition aluminium seat post.
Diameter: Length: 31.6 mm;: 350 mm.Weight: 240 g.
PEDALS
B'TWIN Comp VPR76 clipless pedals (come with cleats).
MISCELLANEOUS
8.9 kg in size M, without pedals.