The two clever reversible saddle rail clamps transform the post from zero saddle setback to 25 mm setback all thatrsquos needed is to flip the clamps from one side of the seatpost head to the other and the offset changes no more problems with getting the wrong seatpost or needing another one when you change the type of saddle you use ndash it now takes 30 seconds to transform your seatpost and the best news is that despite the double functionality the zero25 is even lighter than our pre