Thread: Caravan tyres

Even trailers need tread for grip, trailers slide too, they also need grip for when your braking, otherwise your van will push the tow vehicle, causing a jack knife senerio.

A larger tyre, more area, less heat, better grip, the larger the van the bigger the tyre.

Baz.

Originally Posted by Redback

Even trailers need tread for grip, trailers slide too, they also need grip for when your braking, otherwise your van will push the tow vehicle, causing a jack knife senario.

A larger tyre, more area, less heat, better grip, the larger the van the bigger the tyre.

Baz.

good oints as well.........i have only done a few thousand k's with my braked trailer....all black top in dry weather. waiting to see what happen on dirt roads and or wet weather

Originally Posted by Redback

Even trailers need tread for grip, trailers slide too, they also need grip for when your braking, otherwise your van will push the tow vehicle, causing a jack knife senerio.

A larger tyre, more area, less heat, better grip, the larger the van the bigger the tyre.

Baz.

Less heat, better grip. Those 2 don't go together.


More area, better grip. That's not on road. COF.


Larger then van. Larger the tyre. This is right. Just for durability


Happy days

Originally Posted by joel0407

Less heat, better grip. Those 2 don't go together.


More area, better grip. That's not on road. COF.


Larger then van. Larger the tyre. This is right. Just for durability


Happy days

It's all about co efficient of friction. I'll explain more once I'm at a computer. I'm just on my iPhone ATM.

Originally Posted by Redback

Greater tyre width or length if anything will reduce traction on road. Even before it aqua plans, water will be lifting the tyre from the road and reducing contact pressure.

Contact pressure is the pressure between the 2 surfaces. In this case the rubber of our tyres and the road.

If the contact area is increase the contact pressure is reduced. For example if you had a peice of rubber 1cm square and there was 10kg sitting on it, the contact pressure would be 10kg/cm squared. Now if you double the size of the peice of rubber the contact pressure drops to 5kg/cm squared but you have 2 so the contact pressure remains the same at 10kg/cm squared.

It's generally believed that a good road tyre will have a co efficient of friction (COF) of 1:1. What this means that the ratio of contact pressure to side force can be equal before static friction will be broken and the friction will become sliding friction. Sliding friction of rubber and bitumen is far less than static friction.

Ok. So if you have a COF of 1:1 and the contact pressure is 10kg then you can apply a maximum of 10kg of side force before the 2 surfaces will start to slide. It's irrelivant if the contact area is 1m square of 1cm square. Its how much pressure is between the 2 items that makes the differance.

I can keep going and get into the traction circle but that should be enough for now.

The reason they fit wider tyres to cars is mainly for life of the tyre. To gain more traction the rubber needs to be made softer. If the tyre is softer, it wears out quicker. By making a tyre wider and softer it will last longer for various reasons associated with the width and grip better becasue of the softness.

Some more of what I find funny about people doing things just becasue its cool. I see people fit tyres of the same brand and model but put a wider tyre and wheel on thinking it will grip better. Generally tyre manufactures use the same rubber compond for a specific tyre across the entire size range. So by fitting the wider tyre, it's going to heat up less and therefore be harder and grip less. So funny. And then they'll aqua plan earlier becasue the vehicle isn't heavy enough and I'll get to see their brains all over a tree, not so funny.

Happy Days.

yes yes, I know just buy something!
Yokahama have something called
RY818 Delivery Star


Its listed as a "Commercial" tyre.
yokohama dont do "Light Trucks" ,,,,
anyway some more digging finds it listed as a 195 x 75 x 14C
Its pretty much perfect,
has a solid shoulder, only 3 air gaps, around $100, very few sipes, and most importantly is made by a reputable company.

Of course no-one in Toowoomba has any,, The local Bob Jane can get them in
but "has something exactly the same, out of the same factory, just called ZZZZZZZZ"



LATE EDIT!
hmm, misread the fine print,,
these appear to be available only with an 80% ratio sidewall--
makes the 195 version 10mm taller--- around 660 which wont fit,
the 185 version is the correct height but with a 10mm higher sidewall(flex)
sigh,,

You won't find a better tire than thease would run them on any thing that i could. have had no faults with them in the last 5 years on work vans and on was a 3.2T van. a local tire company fitted a different tyre pirelli and this failed in 3 weeks on that van.