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18th December 2013, 09:38 PM #16Finally, if you've towed before, but never with Electric Brakes, you will find the difference is like chalk and cheese. Mostly it's the control you have from the driver's seat rather than the trailer pushing you from behind to apply its own brakes.
I will never, ever, own a trailer with Over-ride brakes again.
Even if you are pushing close to 2 tonne, yep I know you can get away with 1 braked axle, but in my experience at least, go for brakes on both.www.lockwoodcanvas.com.au
I will never be the person who has everything, not when someone keeps inventing so much cool new stuff to buy.
From an early age my father taught me to wear welding gloves . "Its not to protect your hands son, its to put out the fire when u set yourself alight".
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18th December 2013 09:38 PM # ADSGoogle Adsense Advertisement
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22nd December 2013, 12:16 PM #17Novice
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- Feb 2011
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- Australia
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Question on spring and axle matching
I have read with interest this build as it is very similar to my planned trailer.
Tandem 3200 kg , electric brakes 10 " on all wheels, break away system etc.
When I was getting a price from Yonnee's ex employer I was shopping through the components, 1600 kg per axle , parallel bearings and the salesman suggested 4 tonne springs.
I was puzzled a bit by this because I thought they maybe too stiff and not match the axle load capacity and overload it if loaded closer to the spring capacity.
Is my thinking awry?
I was tempted to go with the 3 tonne spring set up that Yonnee mentioned earlier in this thread.
Your advice please.
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22nd December 2013, 07:35 PM #18GOLD MEMBER
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23rd December 2013, 10:36 AM #19
Kryn's correct.
There's no point having 4000Kg of spring capacity and only 3200Kg of axle capacity. 200Kg is not going to overload a 3000Kg spring set.
I don't want to speculate on who you spoke to, but there's no training required to be a "salesman" in most fields of employment, and the information and advice given comes from experience in the field, and passion for the product and product knowledge. A passionate sales person will, in most cases, have the customer's best interest in mind and these people are difficult to find. Generally speaking, some sales people are purely interested in selling the product with the most profit margin, or up selling to the next sized item without a thought for the customer's long term requirements. Some are there just to collect a 9 to 5 paycheck...Too many projects, so little time, even less money!Are you a registered member? Why not? click here to register. It's free and only takes 37 seconds! Doing work around the home? Wander over to our sister site, Renovate Forum, for all your renovation queries.
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23rd December 2013, 01:01 PM #20Novice
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- Feb 2011
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- Australia
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Thank you gentlemen for your time in setting me straight.
I do want a set up that is matched in capacity as well as possible, is safe and legal.
Cheers.
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9th January 2014, 09:44 PM #21Intermediate Member
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I was doing a little research today while driving the tractor (autosteer can get a little boring) and while browsing a trailer parts website I came across this...
10 inch Electrics have a rating of 1600kg when using 13 – 14 inch Ford or Holden wheels and 1450kg when using 15 – 16 inch wheels. If you want 1600kg on 15 – 16 inch wheels then you will need to go to 12 inch Electrics and 2 tonne drums.
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13th January 2014, 02:24 PM #22Intermediate Member
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Anyone? ^^^
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13th January 2014, 02:58 PM #23Member
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The old ratings come from the days when rims were small and tyre profiles were huge, so work on the OD of tyre. As for your springs, always have them lighter than the axle as the axle does all the work twisting and flexing.
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13th January 2014, 06:47 PM #24Intermediate Member
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I was planning on using 265/65/17 tyres with a load/speed rating of 112T. They have a diameter of around 776mm.
The wheels I was planning on using are 17x8" +42 and are rated to 1180kg each.
What would the load rating of parallel hub and 10" brakes with the above setup on a tandem trailer?
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14th January 2014, 01:01 AM #25Member
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- Dec 2012
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- WA
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Go to Martins Trailerparts Trailerparts Home and download the catalogue, its got all the info you need. And they are most helpful by phone with any questions.
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18th January 2014, 09:44 AM #26
Sorry naddis, I missed this earlier.
As Aufitt has touched on, those ratings/recommendations are from 30+ years ago when cars had 13" and 14" wheels, and 4WD's had 15's & 16". The rating for the Electric Brakes should not purely be based on the size or even offset of the rims alone, but the overall diameter of the tyre. You are correct in your thinking that the larger tyre diameter creates more torque in resistance to the braking effort of the drum and brake assembly. These days, the recommendations should now read;
"10 inch Electrics have a rating of 1600kg when using Passenger car wheels and 1450kg when using 4WD/SUV wheels. If you want 1600kg on 4WD/SUV wheels then you will need to go to 12 inch Electrics and 2 tonne drums."
This is also the consideration for the axle capacity rating as well, as it's the weight of the wheel and tyre combination, not the rim diameter that is the key factor. A light weight passenger car wheel & tyre, irrespective of the rim diameter, has much lees unsprung weight than a 4WD/SUV wheel and tyre and therefore puts less strain on the bearings.Too many projects, so little time, even less money!Are you a registered member? Why not? click here to register. It's free and only takes 37 seconds! Doing work around the home? Wander over to our sister site, Renovate Forum, for all your renovation queries.
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18th January 2014, 10:04 AM #27Intermediate Member
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- Jun 2010
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- Darlington Point
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Thanks for the reply guys.
So a 4wd rim/tyre on a 12"/2 tonne combo is actually rated at 1600kg - is that correct? O is it somewhere in between 1600kg and 2T?
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18th January 2014, 10:07 AM #28
The load rating of the Parallel stub was designed with an "Off-road" wheel & tyre in mind, so should still be 1600Kg per axle, whereas the braking efficiency of the 10" Electric brake with the larger tyres is 1450Kg.
However... the rating of a trailer's registered capacity has never been anything to do with its braking capacity. Plenty of tandem trailer's are out there, legally registered at 2000Kg with only single axle brakes (good for 1300-1500Kg tops...)
So yours, depending on springs, 3200Kg with Rocker suspension, or with Slipper suspension 2666.66Kg.Too many projects, so little time, even less money!Are you a registered member? Why not? click here to register. It's free and only takes 37 seconds! Doing work around the home? Wander over to our sister site, Renovate Forum, for all your renovation queries.
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