Why 19.5?

Improved Stability:

With a 16" tire's high-profile design, the tire is prone to twist and distort as you turn or maneuver the vehicle.  This creates excessive stress on the sidewalls and belt package of the tire which can lead to unseen damage.  The result is tire blowout, often when you're underloaded and traveling at speed.  A 225/70R19.5 has 3.5” less sidewall to flex while driving, cornering, and maneuvering your trailer.  It also features about 60% heavier sidewall construction.  This means you have greater stability both on and off the highway.  You’ll especially notice this when carrying heavier loads, the “sway” will be greatly reduced.  The tire while skid when turning thereby eliminating or greatly reducing the possibility of sidewall and belt damage with the resulting blowouts.


Greater Load Capacity:

Overloading and under inflation are two of your biggest reasons for tire failure.  Your typical 235/85R16 Load Range E (most common trailer tire size) can carry a maximum load of 3,060 lbs. at 80 psi.  However, a Boar Wheel rated at 4,000 lbs. capacity paired with a 225/70R19.5 Load Range G can carry a maximum load of 3,970 lbs. at 110 psi.  That’s over 900 lbs. more per tire in load carrying capacity.  On a dual axle trailer this means that you can safely carry over 3,600 lbs. more cargo with each load. (Never exceed the weight limit specifications of the trailer manufacturer or your axle weight limit.)

Longer Tread Life:

Due to the commercial nature of the 225/70R19.5 a different grade of rubber is primarily used in their construction versus a light truck (LT) tire.  New commercial highway tires often have a tread life exceeding 100,000 miles.  On a 225/70R19.5 we expect them to go 70-80,000 miles on their original tread life.  They can then be retreaded to last an additional 50,000 miles.  This can be done up to two and sometimes up to three times on a 225/70R19.5 resulting an original tire core life of around 200,000 miles or more.  Of course driving surface, tread pattern, proper maintenance, and rotation can all play a part in your tires tread life.  However, you can typically expect about 2-3 times the tread life you would expect from your average LT tire.

Reduced Rolling Resistance:

With the commercial grade highway tread and the increased stability, you’ll also likely notice the reduction in rolling resistance when traveling.  Due to the compounds used and the tread designs available, the 225/70R19.5 is a cooler running, longer lasting tire.

True Commercial Grade:

A 225/70R19.5 is a true commercial grade tire with all steel construction.  The Load Range G is a 14ply rated tire.  Thicker, steel construction provides the solid construction basis you can’t find in LT (light truck) tires.  Due to the construction of these tires, they are capable of being retreaded up to two  or three times within the original manufactures recommendations. 


The 225/70R19.5 has been in the top 5 commercial tire sizes sold in the USA for over 7 years.  They are used by UPS, FedEx, and many truck like Ford F-450 and F-550.  This means that they are readily available in most locations, even remote ones like South Dakota.  Even if new tires are not available right away, a quality, affordable (typically less than $50) used tire is often available at any mechanics shop or tire store.


When you take all these factors into account, the result is a more durable, reliable alternative to your average 16” tire.  When so much is being asked of your tires and wheels, doesn’t it make sense to go with the best possible combination for your application?  We think so.