HF or NT 5 X 8 trailer entension?

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Re: HF or NT 5 X 8 trailer entension?

Postby popper » Mon Oct 18, 2021 5:30 pm

Never thought about the centrifugal forces placed on bearings before. I had always assumed going to larger tire was easier in all respects on every component. It is less RPM per MPH and more cushioning for all the sprung and non sprung components. I love the fact that centrifugal force was brought up.. this forum is great.

veedabowlu wrote:all this accident/insurance talk is BULL...


I agree with you that its BS. Everybody is free to decide what they personally are comfortable doing once they have all the data. I'm thinking about doing a lot of the things you mention doing with your build. Including overhang, and also towing more than I probably should with a weak engine.
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Re: HF or NT 5 X 8 trailer entension?

Postby TheOtherSean » Tue Oct 19, 2021 12:58 pm

veedabowlu wrote:
TheOtherSean wrote: The floor is 3/4" ply that overhangs about 9" in each direction, and is reinforced underneath the perimeter by 2x4's. It is just barely campable at this point, and I have towed it about 3000 miles. It seems fine so far.


Can you share some pictures of this?



Sure. This is what the front portion looked like while painting and during installation. I hope you find this useful.

Front floor section upside down during priming:
20210728_084402_small.jpg
Front floor section primed, upside down
20210728_084402_small.jpg (360.07 KiB) Viewed 626 times


Front floor section upside down during lining:
20210728_181905_small.jpg
Front floor section lined, upside down
20210728_181905_small.jpg (348 KiB) Viewed 626 times


Front and middle floor sections during installation:
20210730_123841_small.jpg
Installation of front and mid floor sections
20210730_123841_small.jpg (351.58 KiB) Viewed 626 times
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Re: HF or NT 5 X 8 trailer entension?

Postby MickinOz » Sun Oct 24, 2021 4:25 pm

popper wrote:Never thought about the centrifugal forces placed on bearings before. I had always assumed going to larger tire was easier in all respects on every component. It is less RPM per MPH and more cushioning for all the sprung and non sprung components. I love the fact that centrifugal force was brought up.. this forum is great.

veedabowlu wrote:all this accident/insurance talk is BULL...


I agree with you that its BS. Everybody is free to decide what they personally are comfortable doing once they have all the data. I'm thinking about doing a lot of the things you mention doing with your build. Including overhang, and also towing more than I probably should with a weak engine.


The centrifugal force on the bearing is actually less, as the bigger wheel is spinning slower for a given road speed.
Other forces, the names of which escape me, but think of the wheel as a lever trying to bend things sideways, are increased.
So, thinking of the wheel as a lever as you apply sideways (axial?) forces, and you can see a bigger wheel places more load on the bearing and axle.

It has been pointed out that many people who want bigger wheels upgrade to a bigger axle.
I'm one of those people. Here in Oz, it's a very cheap exercise to go from a 750 kg 39mm round beam axle to a 1000kg 40mm square axle.
I spent $180 or so, and sold the old axle for $80.
I should point out I did the upgrade because I wanted extra length. I wanted the axle to stick out further from the springs, to get the wheels further apart, and one parts supplier told me the distance I wanted was a bit more than he would usually recommend. So I chose to go to a heavier axle for insurance.

A little research helps.
In my case, my first trailer came with 10 inch cast alloy boat trailer wheels, and I wanted at least 13 inch wheels. I figured the 10's were just plain going to look stupid.

The stud pattern was HT Holden 5 stud which was used on Holden cars with 13 and 14 inch wheels. This included such race winning road weapons as the 327 and 350 powered Monaros, and the mighty GTR XU-1 Toranas.

A little research showed that the trailer manufacturers all offer the 5 stud HT Holden hub, with Holden LM series bearings, for 14 inch wheels on 1000 kg axles.
So my hubs and bearings were good for what I wanted to do.
So, have a look at the bearing numbers on the trailer, and then do a bit of Googling, see what typical setups use this bearing number. Should soon find out whether the bearings are right for the increased diameter.
But take a critical look at the axle. Is it a u-shaped channel with stubs welded into it? That might be too light for the job.
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Re: HF or NT 5 X 8 trailer entension?

Postby friz » Sun Oct 24, 2021 5:25 pm

I'm running stock NT bearings repacked with good grease. Almost ready for my third set of tires. Hubs still running cool. Thousands of miles of interstate driving.Image

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Re: HF or NT 5 X 8 trailer entension?

Postby MickinOz » Mon Oct 25, 2021 8:04 am

Your bearings should last longer than you. The sin bin only weighs about 20 lbs doesn't it? :)
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Re: HF or NT 5 X 8 trailer entension?

Postby friz » Mon Oct 25, 2021 11:29 am

MickinOz wrote:Your bearings should last longer than you. The sin bin only weighs about 20 lbs doesn't it? :)
Soaking wet.

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Re: HF or NT 5 X 8 trailer entension?

Postby QueticoBill » Mon Oct 25, 2021 4:45 pm

Friz - did you upgrade wheels and tires and if so, to what?

Thanks!
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Re: HF or NT 5 X 8 trailer entension?

Postby saywhatthat » Mon Oct 25, 2021 7:12 pm

all this accident/insurance talk is BULL...
LOL better check with your insurance agents about modifications. especially the August 13th crowd have you ever heard of an insurance company wanting to pay out if there's an easy way not to. You think the repair shop is going to store for free if you don't have any work done . Again we do a few a year most owners say it B Especially when we turn over to a collect agency what the lien sale did not cover .Easy to match the wheels with the axle.
Last edited by saywhatthat on Tue Oct 26, 2021 11:11 am, edited 3 times in total.
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Re: HF or NT 5 X 8 trailer entension?

Postby friz » Mon Oct 25, 2021 7:28 pm

QueticoBill wrote:Friz - did you upgrade wheels and tires and if so, to what?

Thanks!
12 inch alloy wheels with radial tires. I'm guessing from etrailer. The originals became spares.

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Re: HF or NT 5 X 8 trailer entension?

Postby QueticoBill » Tue Oct 26, 2021 5:27 am

Thanks!
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Re: HF or NT 5 X 8 trailer entension?

Postby QueticoBill » Wed Oct 27, 2021 7:05 am

Actually Friz, do those wheels and tires make the trailer "legal" for highway speeds or only make you comfortable? The NT 45 mph limit is kind of a bugaboo, and I don't know the basis for it.
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Re: HF or NT 5 X 8 trailer entension?

Postby saywhatthat » Wed Oct 27, 2021 8:24 am

QueticoBill wrote:The NT 45 mph limit is kind of a bugaboo, and I don't know the basis for it.

liability they're figuring you're at a full load .trailer tires have a thicker sidewall so they run hotter
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Re: HF or NT 5 X 8 trailer entension?

Postby friz » Wed Oct 27, 2021 8:57 am

QueticoBill wrote:Actually Friz, do those wheels and tires make the trailer "legal" for highway speeds or only make you comfortable? The NT 45 mph limit is kind of a bugaboo, and I don't know the basis for it.
For one, I modified the kit. Two, changed the tires to an 'M' rated tire. 81mph. Three, technically illegal when ever I tow it because it obscures my tag on the car. Grey areas everywhere. It would probably just take one cop with a hard on for me and the whole mess would be impounded. Thats the world we live in. Always have a sharp lawyer on retainer if you want to be treated fairly.

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Re: HF or NT 5 X 8 trailer entension?

Postby QueticoBill » Wed Oct 27, 2021 4:16 pm

Ignoring laws an liability, the radial trailer tires make you comfortable? And of course now experience.

I like the plan. Just wish I could add brakes.
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Re: HF or NT 5 X 8 trailer entension?

Postby friz » Wed Oct 27, 2021 4:21 pm

QueticoBill wrote:Ignoring laws an liability, the radial trailer tires make you comfortable? And of course now experience.

I like the plan. Just wish I could add brakes.
They do fine. Seem to wear a little better then the bias plys. I pulled at interstate speeds with bias plys also. Never had an issue.

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