The bending stiffness of a tube increases to the fourth power with respect to diameter... Ie bigger tubes are way fucking stiffer than smaller tubes. But steerers are flexy, crowns are flexy, and axle interfaces are flexy. If you put some effort into locking the two tubes together then they work together and will flex together, and this also massively increases stiffness. The keyed axle of the Mattoc or a 20mm axle with four pinchbolts like the old 36, the bulky crown like a lyrik, all help to make the most of their tube stiffness. The flexy modern 36 with...