Surron UltraBee retrofit upgrade

When we changed a new Surron UltraBee original wheel assembly to a 21/18-inch wheel assembly with stronger grip, the original 46T sprocket was upgraded to a 60T sprocket, and a 104-section 520 chain, Remove the triangular connecting rod and replace it with a stronger aluminum alloy connecting rod. After upgrading the front shock absorber to a total length of 800mm and an effective stroke of 225mm, you will find that it is more powerful and powerful than when it was just born. The driving experience will let you you prefer。