Btwin original 900 electric bike review12/18/2022 ![]() 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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