Author Topic: Trailer Coupling Help - Anybody got a trailer with a poly-block coupling?  (Read 3782 times)

Offline Me_3

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Hi guys, i'm picking up a trailer in just over a week, and its got a non-standard looking hitch on it.

I'm fairly sure it will clip onto a pollyblock hitch/coupling for the towball end, but haven't got one to compare it too..

Has anybody got one they could check some measurements on for me? I'm after the pin size, and block thickness.

Thanks!
 

Online Brock

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A pic would help, as we dont know the trailer in question.
Brock
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Offline Me_3

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Attached is the hitch on the trailer, and his tow-bar end
 

Offline Me_3

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I'm fairly sure it looks like one of these will work, but I haven't got one to measure up. the towbar on his bike has a 50mm space between top and bottom holes, with a 12-12.5mm hole for the pin.
 

Online Brock

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I realy dont know, it looks home /custom made
Brock
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Online ST2UP

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I'm fairly sure it looks like one of these will work, but I haven't got one to measure up. the towbar on his bike has a 50mm space between top and bottom holes, with a 12-12.5mm hole for the pin.


Ben this is a TREGG 4x4 coupling....would be very heavy and overkill.....but the principle would work if a motorcycle version was available   :like
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Offline Me_3

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I'm hoping the treg attachment that goes where the tow-ball is will fit what's on the trailer, but haven't got any nearby I can measure up to check.. 😑
Might have to make some calls tomorrow..
 

Online ST2UP

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I have a TREGG in the shed on my wood trailer and can measure up in the morning......but the gap between top and bottom on the receiver for the poly block is about 100-120mm and takes a 25mm pin if that helps tonight  ;-*
Chris    



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Offline Me_3

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I have a TREGG in the shed on my wood trailer and can measure up in the morning......but the gap between top and bottom on the receiver for the poly block is about 100-120mm if that helps tonight  ;-*
Yep, that helps a lot.. It won't fit, so I'm guessing this one is a custom build. No problems, I'll just build the required coupling one night. I have drawings of his setup so it won't be hard to build it.

Thanks for the info..  :beer
 

Offline winston66

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Hi  Me_3.
I do not know if this will help you, There are many different poly block couplings available, but the actual measurements of the one that I have to hand is
Pin diameter that goes through the poly block is 18.85 mm
Height of poly block is 74.8 mm
width is 74.5 mm
Horozantal length of poly block is 100 mm
 The threaded bolt for fastening the receiver to the vehicle attachment  point,  It  replaces the standard ball at the (tow bar) is 21.7mm. If I can find a photo I will attach it to this reply.
Hope this helps.
Cheers winston66, Northampton Western Australia
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Offline winston66

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A further inspection of your photos suggests to me that what you have is a home built adaptation which uses two  fulcrum points with solid steel pins and sleeves which allows  rotation about the separate vertical, and horizontal axis of movement. I can not see that coupling actually using a poly block component as I have shown in my previous post.
Good luck with your new trailer,
Cheers, Winston66, Western Australia
winston66 Northampton
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Current Rides,
1996 Yamaha XVZ 1300 Royal Star,
2003 ST 1300 A (red)
Mazda Miata MX5 Turboed 14 sec.
2006 ST 1300 ABS Ex Police (white)
Honda CT 110 Postie, (Being rebuilt)