Quote:
Originally Posted by nachob
135i suspensions were designed for run flats so they are softened a bit to reduce harshness. With that said having lower offset wheels than were intended for the car can have the effect of softening the suspension on top of that. If you can imagine the suspension arms pivot and the farther out you go from the pivot point gives you mechanical advantage. Like when you use a pry bar. If you grab it close to the pivot it takes a lot of force. The farther away you go the less force required. So when you go into a corner with wrong offset the mechanical effect pushes springs up with less force. So if you plan to change both at same time it can be a drastic change especially if you run run flats. So I would first decide on proper rims and tires first and see how you like it. Then you can pick up some bmw performance shocks and springs from 135is or a coil over kit. Also don't forget sidewall aspect. If you are running 18" you can also go stiffer but 19s also impact ride and performance. It's a system meant to work together not separately. So I recommend you go with proper offset 18s with non runflat high performance tires first. Then see how you like it. Stiffer is not always better and I can tell you the interior plastics in our car are not very good so be ready for a lot of creaking and rattling if you go stiff. Best wishes
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I already have wheels and performance tires (non runflat) that are the proper offset (no offset) I had an extra set of rims my cousin had on a 5 series, I took them and put proper sized winter tires on it expect they have 30 mm of offset making the car look mean but rub the fender on bad bumps. I was hoping to get away with using the wheels but they seem to be slowly destroying my new winter rubbers.