City Bikes are gaining prominence in recent years, thanks to the rapid development of...
Gone is the Speed Pro TT that is best known to Dahon fans as the ultimate bike for speed and aerodynamics on a foldable bike. But Dahon hasn't abandoned the spirit of the Speed Pro TT - they merely changed the name to "Vector x27h" and improved it.
The new name comes with various implications. First, it's a whole new frame. No longer is the bike built on the "Speed" frame. Instead, the all-new Vector frame is used and is supposedly supposed to be more rigid than its predecessor due to new method of producing the frame - hydroforming. This newly adopted process allows complex manipulation of the thicknesses of the tube and previously impossible shapes to be formed, allowing the frame to be stiffer yet lighter.