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Old 12-05-2019, 09:32 PM   #1
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What exactly is a tag axle

I've had my 2007 Class A for four years now and pretty much live full time in it. Today was the first time I heard the words "tag axle" used.

What exactly is a tag axle and how does having one make the coach easier to steer and handle in the wind as I believe was initially mentioned here.
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Old 12-05-2019, 11:33 PM   #2
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This a photo of a Newmar coach with a tag axle. They're typically added to increase the load carrying capacity of a coach. As a coach gets longer, (typically 42+ feet) there is too much weight on a single axle with dual rear wheels. The solution is to add a second axle to carry additional weight. A tag axle on a motor home and buses are a single tire on both sides, not another set of duals.

The tag axle not only carries extra weight, but it also helps with coach tracking. The third axe basically forces the front and drive axle to stay in a straight line.

Years ago, high end coaches had equipment that lifted the tag axle at low speeds to prevent from scuffing the tires as they dragged in tight turns. Many modern coaches now have steering incorporated into the tag to help the coach turn tighter at slow speeds and to also prevent scuffing. The coach in the photo below has a tag that both turns (steers) and the air bags that support it, dump their air to take the weight off the tag, to again, prevent scuffing.

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Old 12-06-2019, 04:47 AM   #3
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On my first coach 96 Southwind, I had a tag axle. Being a third axle it, to me, helped keep the coach in a straight line going down the road. It made the ride feel more stable also. I think for older coaches that have them it was also for the weight and the rear drive axles coach overhang. I know from my experience I have no complaints, except when buying tires!
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Old 12-06-2019, 05:23 AM   #4
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In the 90s the higher end coaches such as Bluebird, Prevost had a steering tag axle.

Many commercial trucks have tag or DROP
Axles to use when hauling heavyweights, maximum loads.

Concrete Dump trucks to name a few.
Tag axles were developed for commercial and emergency vehicles such as fire trucks,
Greyhound, Trailway busses.
Many, many years ago.

Then you have the ( twin screw ) as found on some supper C RVs and Military, Commercial Vehicles.
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Old 12-06-2019, 02:22 PM   #5
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Solid explanations above. A tag axle is there to carry extra weight. Any other effect, positive or negative (there are both), is an incidental side effect to its main purpose in life.
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Old 12-06-2019, 03:06 PM   #6
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Tag axles are great for extra weight carrying capacity, but on a 40' coach you lose at least two storage bays for the extra axle.
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Old 12-06-2019, 03:18 PM   #7
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Welcome to the forum. Thank you for asking your question. Many others here may have been afraid to ask and now they know.
There are many folks who will gain valuable knowledge by someone else's questions and the answers put forth.
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Old 12-06-2019, 03:36 PM   #8
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Our first Type A was a new '98 Santara, then two DP's without a tag and now one with a tag. On the Santara the tag added weight capacity, stability and porposing. Next two DP's should have hadvtags as they were close to overweight as delivered. Present rig has about 10,000#'s of CCC.
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Old 12-06-2019, 03:39 PM   #9
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A tag axle is behind the drive axle(s), and a pusher axle is in front. So the current definitions go, though decades ago we called the pushers on our tri-axle trucks 'tag' axles. <shrug>

Additional axles were added only for weight carrying and bridge requirements, not for any other reason. All of the tri-axles had spring lift function on the pushers, with airbag suspension, and were not steering. If you didn't lift the axle, the turning radius was much larger.
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Old 12-06-2019, 04:44 PM   #10
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Also adds another set of brakes.
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Old 12-06-2019, 04:51 PM   #11
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Next time you see a dump truck with a set of rear wheels off the ground you'll know what it is.
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Old 12-06-2019, 06:49 PM   #12
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If no one has mentioned it, the tag axle is never a powered axle.
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Old 12-06-2019, 07:19 PM   #13
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Quote:
Originally Posted by MoCoTom View Post
If no one has mentioned it, the tag axle is never a powered axle.
Tom
Powered double axles are called "twin screw".
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Old 12-06-2019, 07:25 PM   #14
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Example of a tag axle.


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