ONE-POINT-FIVE VERSUS TAPERED

At german:A. we like asking questions and we like giving answers. As the trend of 1.5 „or“ tapered „- headtubes started, we didn’t only want to follow the trend but instead wanted to deal with the subject critically and ask ourselves if and how we would implement the subject. Since “me too” isn’t really us, we found our own solution for the most strained part of a fork. In a single track vehicle the suspension forces and the maximum working loads are transmitted through the bearing of the steerer tube (steering head bearings, headset) into the frame. The lower bearing is located on the steerer of the fork, this is the most critical point with the highest loads and the biggest force leading to the maximum tension of the construction element.

Fig.1: Tapered System

To make „the weakest link“ of the transmission safer, the size of the steerer was increased from 1 1/8“ to 1.5“. In fact this increase helps significantly, but can not be implemented at the same weight. Although the thicknesses of this highly loaded point can be reduced while increasing the strength, the overall weight will be higher. „Tapered“ or the conical taper of the tube also leads to a high production cost of this solution.

HOW TO SOLVE THIS PROBLEM? IT‘S ACTUALLY PRETTY EASY (AS WHITH MOST GOOD IDEAS)
The bearingseat was integrated into the crown of the fork! As a consequence, we now have an almost complete decoupling of the suspension forces from the steerer tube! These forces are now lead directly through the bearing (needle bearings, ball bearings) into the frame. The steerer tube is now only a functional part. It supports the axial bearing forces (to minimize the clearance of the headset) and takes the forces of the handlebar through the stem.
Therefore, the steerer tube can be designed very light and simple! No more chassis related tensions will occur within the steerer tube. This also results in a high level of operational safety and minimum weight!

Fig. 2: One-Point-Five System

Downloads

Click on the disk-symbol to start the download.