Not so easy task as imagined

Rear trailing trailing arm bushes were replaced into movable original ones from STI harder parts. As we know, this compliance bush design play a great part of the performance of good ride, rigid stability and movable compliance capability are the things to the contrary, so, factory designing engineers make efforts on this proposition to role out new model, of course, repeating experimental trials had been done utilizing sophisticated measuring equipments prepared for the purposes based on their own know-how and background nourished by themselves for long term experiences. It goes without writing here that any changing by the users into different parts on a whim by layman would not bring good result, because any change of original design would destroy the balance of ultimate by the specialists.

Replacing frontal tires on OPEL B-Vectra caused some change in steering centric position while straight running, revealing that tire uneven wear that is inevitable for ordinary use could affect on wheel alignment not a little actually. So, some tire position changing might be one of a choice to correct steering habit. Paying attentions on this fact, wheel alignment correction must be performed. Anyway, rubber materials applied everywhere in a car are the substances that can not be overcome so easily. The stronger enemy is the more interesting to be attacked.