It’s sharp enough for racing, comfortable enough for fast sportives, and you could squeeze in a pair of aftermarket mudguards to create a slick winter trainer. The geometry falls between full-on race bike and endurance, and you could use this for pretty much anything. B’Twin Ultra 900 AF overall impressionī’Twin’s designers have created a bike that scores highly for a quick, dynamic and enjoyable ride. And I reckon Specialized’s 26mm tyres and some 28mm rubber would fit, adding a little more plushness too. With some of the money you’ve saved you could always get yourself a carbon post or an adaptor for a narrower seatpost for more comfort. The carbon fork legs do the same at the front. The seatstays are slimmer than some and the lack of a brake bridge will reduce stiffness too, and there’s enough of the seatpost exposed to provide at least some give.
The triple-butted aluminium frame is stiff and very much performance orientated, and I felt that the seatpost might make it too harsh through the saddle, but it manages to stay on the right side of firm. The other concern - that seatpost - was also largely overcome by B’Twin. The positive, though, is that the brakes do work very well, with loads of controllable power. This is something that B’Twin is obviously aware of because the brakes are going to be moved on future versions of the Ultra AF. Mavic Aksium wheels and 25mm Mavic Yksion tyres B'Twin
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