Blowouts!

While a "blowout" sale is usually a good thing, having a tire blow out on your RV, OHV, or tow vehicle certainly is not.  Blowouts can cause serious damage as pieces of the fragmented tire slam into parts of the vehicle or friction heats things up and causes a fire.  I've had motorhome and trailer tires blow out a few times, and it is never a pleasant or inexpensive proposition.  After a tire blew out on my enclosed motorcycle trailer I discovered it was likely caused by a failed magnet in the electric brakes that had locked up the brakes and made the tire drag.  In addition to the tire itself, it destroyed the wheel and the fender skirt and the collapse of the tire allowed the entry step to hit the ground and get bent way beyond repair.  Same with the pricey electric tongue jack.  The leaf spring on that side was also damaged.  I had to replace both springs and both brakes (springs and brakes should always be replaced in pairs).  I was unable to find a matching fender skirt so I had to replace the skirts on both sides to maintain a consistent appearance.  By the time all was said and done the total bill came to about $1200 from a single blowout.  A tire failure on an OHV can create handling problems sever enough to cause you to loose control.

I had a nearly new right front tire blow out on a class A motorhome on one trip.   I discovered the cause of the failure was a new valve extension installed by the tire shop.  The technician there had claimed the braided stainless steel extensions I had been using were prone to failure and talked me into installing solid semi-truck style extensions.  Unfortunately, the new extension he installed rubbed against the wheel cover until it wore a hole in it and allowed all the air to leak out of the tire.  The flapping of the exploded tire ripped out all the wiring for the lights (headlight, park light, and turn signal) and destroyed the outside cabinet behind the wheel well.  We gathered up the scattered contents of the shattered cabinet and avoided driving after dark until I could re-wire the lights.  Then I had to rebuild the cabinet when I got home.

The loss of a left rear inside dual on a 40' diesel pusher managed to damage the primary plumbing near the water pump adjacent to the wheel well.  All my fresh water leaked out and I couldn't even use park hook ups until I was able to repair the broken pipe.  I never did figure out what caused that particular tire failure.  The tire had been in good condition at the start of the trip and I religiously check tire pressure every morning before hitting the road.  I suspect it may have been damaged by some kind of debris on the road.  You never know when you'll pick up a stray nail somewhere.    BTW, straight nails seldom cause problems but bent ones frequently penetrate tires.

Way too many blowouts are simply a result of under inflation.  A soft tire will quickly overheat and together with the stress of excessive flexing of the sidewalls will soon fail under highway conditions.  Under inflation can usually be avoided by simply checking tire pressure regularly.  Under inflated tires will usually look "squishy" and will be hotter than properly inflated tires after driving.  They will also wear excessively on the outside edges.  Under inflated tires may show excessive wear on both edges of the tire.  Whenever you discover an under inflated tire, bring it up to the correct pressure as soon as possible.  However, driving on an under inflated tire will sometimes have already caused enough internal damage that the tire has been weakened and will fail prematurely.  The best way to ensure proper inflation is to check tire pressure with an accurate gauge.  Truckers and some RVers will use a "tire thumper" as a way to quickly see if tire pressure is approximately where it should be.  Soft tires will give off a dull thump instead of a sharp thud and an experienced driver can usually feel as well as hear the difference when the thumper strikes the tire. 

Over inflation isn't good either, but it usually doesn't cause the rapid and catastrophic failures associated with under inflation.   Over inflated tires will cause handling and ride problems, making the vehicle feel skittish and the ride harsh.  Over inflated tires will show excessive wear in the center of the tread.  Driving on overinflated tires too long could cause the tread in the center to wear enough to cause a blowout.

Proper inflation also contributes to better gas mileage and good handling.  Under-inflated tires have more rolling resistance and will make handling soft and mushy.  Over-inflation will reduce traction and make a vehicle feel "squirrely".

Overloading is another common cause of tire failures.  Some large motorhomes are very close to the maximum chassis and/or tire rating as they come from the factory so it is all too easy to over load them with passengers and equipment.  If you suspect your vehicle is overloaded, take it to a truck scale and weight each individual wheel. Knowing the weight on each wheel will allow you to set the right tire pressure for the load.

Dragging trailers brakes can also cause tire failures.  If trailer tires get unusually hot when towing the brakes may be dragging and should be inspected and adjusted.  Sometimes the problem is that the brake controller in the tow vehicle is maladjusted and that isn't really an equipment failure, it is an operator error.

Failed suspension components can put inappropriate stress on tires.  Weak or broken springs and/or shocks can stress tires and sometimes either rub directly on the tire or allow it to rub on other parts of the fame or body.  If a vehicle sags more on one corner than the others or if a wheel seems to be leaning or the body appears to be lower than it should be you should have the suspension checked.  Worn, bent, or broken suspension can not only cause tire failures but could cause a loss of control that may result in a serious accident.

A blowout on a motorhome is usually very apparent the instant it happens but drivers of tow vehicles are not always immediately aware of tire failures on trailers.   A few years ago an older couple pulling a travel trailer through Idaho and Washington failed to notice a flat tire on the trailer.  Flaming debris from the dragging tire ignited several wildfires along their route.  How can a driver not notice a flat tire?  A flat on the vehicle you are driving is usually pretty obvious, but one on a trailer can be well disguised, especially if the trailer is relatively small compared to the weight and power of the tow vehicle.  The driver of a 40' motorhome pulling a little 15' utility trailer probably won't feel anything if a trailer tire blows out.  However, he should be able to see the trailer leaning when he checks his rear view mirrors or back up camera and you may see smoke, dust, or sparks from dragging components.  You should frequently monitor the attitude of your trailer when towing. 

If you do experience a blowout, DON'T jam on the brakes!   Keep a strong grip on the steering wheel and slowing gradually,  pull over out of traffic, allowing the vehicle to slow, using the brakes as little as possible.  Jamming on the brakes can cause a sudden grabbing of the damaged tire and wheel, resulting in an unexpected change of direction and/or loss of control. If you lose a front tire you may be able to slow down using the hand or emergency brake which usually activates the rear brakes or a special brake on the drive shaft on some vehicles.

Blowouts on OHVs are perhaps a little less frequent than on highway vehicles, but they can still happen.  Most of the OHV blowouts I've seen have been due to a sudden impact with a hard obstacle.  Normal OHV operation usually doesn't generate the kind of heat that highway driving does and heat is often a significant factor in highway blowouts.  But, if you like to jump your dirt bike or ATV, figure one of these days you will come down hard enough to pop a tire.  An a dirt bike that usually means limping back to camp on a flat tire.  For ATVs and UTVs often means either removing the damaged wheel(s) and taking them back to camp or bringing replacements out before you can reasonably move the vehicle.  So, if you're doing any serious jumping, prepare yourself for the time when you blow out a tire upon landing.  There isn't much you can do except try to control the little beast and get it safely stopped as soon as possible.  Driving on a blown tire may damage fenders and suspension as the tire comes apart from the pounding.

Smooth motoring!