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My wife was just rear-ended by some woman who was "tired" (her claim—in fact she was more probably texting) and not paying attention. This did a lot of damage to the rear end of our Honda Pilot. This is the third accident my wife has been in in a year where someone else was not paying attention, and I want to take some preventative action. Grill guards (and rear bumper guards—I'm using the term generically since a search for "grill guards" will bring up both) give the appearance of being strong and solid pieces of metal that add extra protection for the body of your car, but I'm wondering if that appearance is deceiving. A grill guard

Here are some examples: http://www.amazon.com/2009-2013-Honda-Bumper-Protector-Stainless/dp/B00D6940S0 http://www.amazon.com/Custom-Bumper-Mounting-Hardware-included/dp/B00D30S970

One reason for my skepticism is from the blurb here, which says

Honda Pilot 2004, 2.5" Ultimate Bull Bar by Westin®, with Removable Stainless Steel Skid Plate. The secret of living a peaceful life in the asphalt jungle is to add a scary edge to your looks. The Ultimate Bull Bar is perfect for the purpose....

The fact that they focus exclusively on the appearance and do not even address the issue of structural protection leads me to believe perhaps they know it's all a facade, and are carefully avoiding making any claims they know could come back to haunt them, so they sell it as a way of massaging their customers' egos rather than actually protecting anything or anyone.

How much protection do these actually offer? Can they in some situations eliminate body or structural damage to your car, and in others reduce it?

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up vote 2 down vote accepted

There a several moderately complex and variable issues in this question. It is impossible to adequately adress all the variables, but here are some key points.

First there are almost no after market protectors for the rear of the most vehicles. There are some companion rear bumpers sold for "brush guard" type front bumpers. While heavier than stock bumpers they are primarily geared towards providing solid points of attachment for towing and pulling. These will provide little additional protection in the case of a rear impact, and may actually lead to increases in damage (at high speed) as they tend to be mounted directly to the frame, so any shock absorber benefits of a stock bumper are lost.

Grill guards come in two basic styles, "just for looks" and "intended for impact". As you may expect many of the chrome plated grill guards you see in your daily drive are just for looks. While shining does not always mean just for looks, the majority of "intended for impact" bumpers (in my experience) are painted flat black. This is because, you expect them to come into contact with; brush, rocks, trees, earth. Touch up with a can of flat black spray paint is really easy.

The primary identifier of an "intended for impact" front bumper/quard is it's attachment. Let us consider the grill guard pictured in the question. The stock bumper is still in place, so it is unlikely that the "guard" is bolted to the frame, in most of these types of applications it the guard is connected using light screws to equally light body parts. In the event of a frontal impact, the attachments will pull out, tearing the parts of the body, it will then fold up into the grill of the vehicle. All of this happens before the shock absorbers in the stock bumper have the opportunity to do anything. So a collision that may have left no notable blemish on your truck, has torn out part of the lower radiator support, and smashed your grill.

Bumpers/guards designed for impact (some examples) fully replace the stock bumper. There are bolted directly to the frame and are intended to transfer any force applied directly to the frame of the vehicle, protecting the soft parts like, fender, grills and radiators. There are a many options for brush type additions on the basic frame mounted bumper. Personal preference and expected terrain are the primary motivators in the decision. If you are going to be driving up on rocks you might want something like this.

My TJ on Rocks

Another body protection option is for the side, often called "Nerf Bars" or "Rock Guards" these are bumpers for the side of your vehicle. These are particularly helpful when you have the possibility of having rocks or trees, impacting the side of your vehicle. As with grill guards these also come in "just for looks" and "intended for impact". If they screwed to tin rather then bolting to a steel frame, you are likely to do more damage by installing something "just for looks". Particularly if it has more impact than someone standing on it to get in the vehicle. A well constructed nerf bar, can actually be used as a fulcrum while in off road situations.

So to answer your question. If you buy and properly install quality protection it can offer a lot of protection. Particularly in low speed high force events. My TJ was 10 years old and not a dent in the body when I sold it.

But if you are in a highway speed accident, little additional protection is offered. These devices work by transferring forces away from light duty body parts to the stronger steel frame.

My TJ second shot

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They definitely offer protection against light and moderate accidents. So if it's for city driving, I'd say go ahead and get one. Just remember that putting something on the front of your car won't make any sort of difference if you get rear-ended.

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Generally, think if it as by putting more stuff between you and the other guy will help. If you put something like this Beaver Step in place of the hitch, it will provide your rear end more protection. It would destroy the front end of their vehicle, but who cares since they are the one who is "tired" or "not paying attention" ... whatever you can put between you and the other guys is ultimately going to help. Hopefully it doesn't make your vehicle ugly in the process. –  Paulster2 Jan 15 at 11:53
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I use a steel roo bar (kangaroo's endemic here) bolted to chassis using high tensile bolts incorporating sleeves in chassis rails so they don't compress.Same applies to rock sliders.At the end of the day the purpose is to protect your radiator so you can limp home.If putting a heavy steel bull/winch bar on a 4wd your front shocks/coils may need upgrading to maintain ride height

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Can you explain the bit about "high tensile bolts incorporating sleeves in chassis rails so they don't compress" in a little more detail? –  iconoclast Apr 7 at 22:08
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