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I purchased a set of stock sport springs from a fellow bimmerfester. Upon my receipt of the springs I noticed that one of the rear springs were shorter than the other. I contacted the person I got the springs from and he told me that they were supposed to be that way and that they had come directly off of a 540 sport. I proceeded to do a little research of my own on the matter and found out that the one shorter spring was supposed to compensate for transfer of power when you drive hard and fast, (crouch) in the rear of the car. When my car is parked, I notice the slight lean of the car to the drivers side where the shorter spring was installed. I also have noticed an extemely faster wear pattern on my front drivers side tire over the rest of my tires. I'm wondering if that shorter spring in the back is the reason for this. I have decided to purchase a new set of BavAuto Sport springs to try out and hopefully get a better result. If there is anyone who can shed some more light on the matter or has any advice on what to check suspension wise to find out why one tire is wearing faster than the other three, chime in and let me know something!