With this info, we can make the measurements for the trailer — or maybe more accurately — take measurements FROM the trailer before ordering trailer axles. That way it all matches when we get them. To get some of the fitting info, we need calculations.
Here are some more definitions with explanation for key pieces to match and properly mount the new trailer axle. Mentioned above — either Spring Centers or outside Frame Width. This is a measurement from the trailer directly. Note the difference in the measurement for Leaf Springs versus Torsion Axles. Hub Faces Distance Also from above. This measurement is explicit on the axle, but must actually include other factors as shown in the images.
Overhang The distance from the axle supports, out to the hub face. Axles are specified with a Max and a Min Overhang. True for both leaf spring axles and Torsion axles as in the tables. If the overhang is too short, the frame will interfere with the tires, or the mounting becomes ridiculous. If the overhang is too large, it reduces the actual axle capacity. Axle specifications are available from vendors like this data tables from Dexter showing the allowable Overhang.
Tire Clearance Like it sounds, this is the space between the moving tire and everything else. We must have Clearance between the frame and the tire as in the front view image, and also radially around the tire side view image , especially vertical for suspension travel. In a battle between steel of the trailer frame and rubber of the tire, the tire loses.
Overall Width The total distance from side to side including the tires. Check local laws if you want to go wide, because most jurisdictions limit width. Ground Clearance Needed clearance over the ground is really in 2 parts. First, the clearance of the axle itself over the ground; and Second, clearance for the main portions trailer. Clearance for the axle is set by being a Drop or Straight axle No-Load Arm Start Angle for torsion axles and the tire outside diameter.
Bigger tires give more ground clearance. Trailer ground clearance also adds in Overslung or Underslung spring mounting as well as any spacers used for frame lift. These two combine to define ingress and egress angles for the trailer. These items are really important when specifying the axle to buy for your trailer.
Or, as the case may be, to know as you build a trailer for the axle s you just scored from your uncle. When you order an axle, here are the details you must provide. Typically, trailer wheels and tires order separate from the axles. The above is basic info for trailer axles.
Please follow the hyperlinks to other articles with more detail on the linked topics. While this info does not include specifics for your trailer, we are confident you can handle it from here.
Just so you know, the Mechanical Elements Trailer Plans have all the necessary information listed to order the right axle s. The information is in the instructions document, in the list of materials. Configure it to your needs using the various options - all included in the plans. Read The Article. This is our longest lbs tandem axle deck-over trailer. These plans are fully engineered and include so many options, because you expect more from plans at Mechanical Elements.
Walking-Beam style trailer suspension plans are engineered for mid-size trailers. The design combines benefits of torsion axles with the excellent tandem load sharing of twin pivot beams. Form follows function in this attractive, modern speaker cabinet.
Yes, it looks cool, but more importantly, all the non-parallel internal surfaces resist resonances for a beautiful and dynamic sound. Show Me GO. Trailer Axles — The Specifications Axles including the wheels and tires have several key bits of defining information. Measurements and Calculations for Matching the Trailer To get some of the fitting info, we need calculations. Ready To Order?
Learning More The above is basic info for trailer axles. Inline Feedbacks. View Comments. Load More Comments. If you don't happen to have the hub on the good side of the broken axle but the good side is otherwise unharmed, you can still get the measurement.
Again, we assume that the axle is not broken between the springs. Get the spring center measurement as above. Now, on the good side, measure from the center of the spring to the tip of the spindle and multiply that by two and add to the spring center measurement. If any of this is at all confusing, give us a call at Champion Trailers at and we'll be happy to answer your questions or step you through it. Use of these items without prior written approval will be considered to be infringing on our trademarks and copyrights and will be dealt with accordingly.
Be sure to identify axle over or axle under springs when you select your part number 2. Quick Tip An easy way to measure your spring center is to hook a tape on the outside of one spring and measure to the inside of the opposite spring. End to End Spindle Measurement To do this one, you have to pull the wheels off of both sides. What if your axle is broken.
You can still get the hub face measurement provided: You are still able to take a spring center measurement. One of the sides of the axle is intact. If that is the case, take the spring measurement as above. Hub face to hub face can also be called the axle track or the center line of the tire to the center line of the tire. Trailer axle drop is the distance from the centerline of spindle to bottom of the main axle tube.
NOTE: In straight axles, you measure from the spindle centerline and axle main beam center line. Therefore, there is no drop.
Trailer axle spring center is the distance between the center of one spring to the center of the other. Trailer axle spring center pads are locating or centering pads that can be welded or left loose and are meant for the leaf springs to mount onto.
Springs pads can be located at the top or bottom of the axle main beam. DO NOT drill holes in the beam in lieu of using spring pads. This would set up stress concentration points, which will weaken the axle beam and allow water to enter. When replacing your trailer axle, determine how it was previously mounted. Under slung mounts have the spring mounted below the axle and over slung mounts have the spring mounted on top also called reverse axle. Spring seats or centering pads can be mounted over or under the axle.
Some axles have "camber" or road set, so there will be a bow in the axle until weight is applied. Cambered axles should be mounted with the center bow on top.
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