There are several differences between the VanMoof S3 & X3 and the VanMoof S4 & X4. They are listed
below.

• Our 4 series are painted using a powder coat paint.
• There is an integrated phone mount in the handlebar which replaces the matrix display.
• Both the S4 and the X4 tires have the new VanMoof updated pattern. The tires on the S4 model are also
  thicker than the previous S3 model.
• Instead of the E-shifter, the 4 series comes with a 2 speed automatic hub.
• Improved battery, Kick Lock, brake pads and brake discs.
• The top tube height of the S4 is slightly lower than the VanMoof S3.
  

For more details, check our e-bike comparisons page.