Technical questions on Quest V1 and V3

V3 (from the site): “The frame has been evaluated and redesigned with a larger diameter seat post for added strength while retaining the same weight”.
Question on old V1: Was there any problem with the V1 seat post?  Why was it redesigned?

V3 (from the site): “The Quest now takes 1.5" tires front and rear”.
Question on old V1: Which is the widest tire the V1 takes?  Both front and rear?  Does the 451 have different tire limits than the 559?


Jose Vargas