Bad rear axle shocks very common?

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Discussion Overview

The discussion revolves around the observation of rear wheels on various cars appearing bowed outward, prompting questions about the potential causes, including the role of bad shocks, vehicle overload, and alignment issues. Participants explore the phenomenon in the context of vehicle design and suspension systems.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants observe that bowed outward rear wheels seem common and question whether this is due to bad shocks or an epidemic of some kind.
  • One participant suggests that the bowing could be a result of the rear of the car being overloaded.
  • Another emphasizes the importance of four-wheel alignment and proper suspension for vehicle control and safety, noting that incorrect alignment can lead to issues with how the vehicle tracks.
  • There is a discussion about negative camber, which can improve handling but may lead to uneven tire wear if not properly aligned.
  • Some participants mention that worn springs and independent suspension systems could contribute to the observed bowing of the rear wheels.
  • One participant points out that the phenomenon is consistently seen in rear wheels and occurs across many vehicles, suggesting that overloading is unlikely as a cause.
  • Another notes that some performance cars may have a design that results in similar outward bowing from the factory.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the cause of the bowed rear wheels. Multiple competing views are presented, including the effects of overload, alignment issues, and design characteristics of vehicles.

Contextual Notes

Participants mention various factors that could influence the observed phenomenon, such as vehicle age, suspension type, and alignment practices, but do not resolve these complexities.

DaveC426913
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Some point a while ago while driving I noticed a car whose rear wheels were noticeably bowed outward, thus:
LJ20081224_wheels.gif



Now, wherever I go I notice cars like this. Always the rear wheels, never the front. It seems to be very common.

Is this due to bad shocks? Is there an epidemic?
 
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I never noticed that. Could it be because the car's rear is overloaded?
P.S. I am a total car noob
 
Last edited:
Four Wheel Alignment is necessary on today's design vehicles, yet it remains a mystery to most people. Correct Alignment and a properly operating suspension are vital to vehicle control, not only for safety but also for comfort when driving a vehicle. There is a possibility of incorrect rear wheel thrust line, which can cause the vehicle to pull or push in the opposite direction the wheels are pointing...
http://peugeot.mainspot.net/tips/four_wheel.shtml

In its most basic form, a wheel alignment consists of adjusting the angles of the wheels so that they are perpendicular to the ground and parallel to each other. The purpose of these adjustments is maximum tire life and a vehicle that tracks straight and true when driving along a straight and level road...
http://www.familycar.com/alignment.htm
 
Last edited by a moderator:
DaveC426913 said:
Some point a while ago while driving I noticed a car whose rear wheels were noticeably bowed outward, thus:
LJ20081224_wheels.gif



Now, wherever I go I notice cars like this. Always the rear wheels, never the front. It seems to be very common.

Is this due to bad shocks? Is there an epidemic?

Have you had a rapid influx of out of state residence; or a VW beetle invasion? But the first would be bad shocks not springs...
 
the particular angle you're talking about is camber, particularly negative camber. Negative camber improves friction bonds on turns, but most standard automobile tires are designed so that they'll wear evenly with 0 camber.

Most people never get their vehicles aligned though so it wouldn't be surprising to see it a lot on older vehicles. Do you think most of the examples you saw were older?
 
I'll have to check out rear end axles. Worn springs will decrease in length. With a solid rear axle the wheels will stay parallel--which is what I have. But without two universal joints on each side, worn springs should allow sagging. But I'm talking about rear wheel drive. Guess I'll have to look at independent suspension too.
 
Whatever hypothesis is put forth will have to agree with the fact that:
- it is always the rear wheels, I've never seen front wheels do this
- it happens across many cars, not rarely (so overloading is unlikely)
- it does seem to occur on newer cars as much as older cars
 
I think you are probably noticing it on vehicles with independent rear suspension (swing axles). It can be cause by overloading, weak springs, or worn trailing arm bushings.

Then again some performace cars come that way from the factory.

http://www.drivearabia.com/news/wp-content/uploads/2007/07/2008-mercedes-benz-c63-amg-3.jpg
 

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