Someone check my Maths please ?

Marauder

Marauder

Free Member
Joined
Nov 14, 2020
Posts
331
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205
Location
S.Yorks
Funster No
77,809
MH
Adria Compact SP
Exp
20 yr
I was quoted just over £100 each for Hankook Vantra LT RA18 ( are they different from Lantra ?) from McConnechy's in Perth.

Load rating on Vantra LT RA18 is 107. = 1030 Kg (so the tyre guy told me). 2 on axle =2060kg.

Lenny's 10% (of 2060) = 206kg 2060+206 = 2266Kg

So these tyres can carry 210kg in excess of my max axle load. (or have I got it completely wrong)

my front axle is rated 1850max.

or does it mean 1850 + 10% = 2035kg


I'm getting confused now, maths never was my strongest point !!

Someone check my maths pls ?

Steve
 
Should be fine you axle max will be in excess of your actual load too.

Cheers James
 
Lenny HB said:
Your maths is correct but with a standard van tyre I would like a bit more margin if they are ever lightly to be put on the rear.
Click to expand...
How to get more margin ?
 
Jamesh said:
Should be fine you axle max will be in excess of your actual load too.
Click to expand...
James - how could you tell what my actual load will be ?

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A 107 is only 975kg so max axle would be 1950kg. If your max axle is 2056kg?then I'd be looking at least a 112 rating to allow for offset axle loading.
 
Marauder said:
I was quoted just over £100 each for Hankook Vantra LT RA18 ( are they different from Lantra ?) from McConnechy's in Perth.

Load rating on Vantra LT RA18 is 107. = 1030 Kg (so the tyre guy told me). 2 on axle =2060kg.

Lenny's 10% (of 2060) = 206kg 2060+206 = 2266Kg

So these tyres can carry 210kg in excess of my max axle load. (or have I got it completely wrong)

my front axle is rated 1850max.

or does it mean 1850 + 10% = 2035kg


I'm getting confused now, maths never was my strongest point !!

Someone check my maths pls ?

Steve
Click to expand...
Have a look at Camskill website, I found they were the cheapest when I was buying tyres. What size do you need ?
 
I fitted the Nexen Roadian CT8, it was a toss up between them and the Toyo’s
02F3401A-A713-41C2-AA17-FE2493FDB858.png
. Very happy with them being quieter , better economy and handling over the Michelin Agilis Alpin tyres I had on.
 
I'm not totally convinced you should put a lot of faith in the tyre ratings. If you look, small changes in sizes with the same model from the same manufacturer can apparently have large impacts on the figures. I've seen 215s have wet ratings of 'E' and yet the 225s in the same range have ratings of 'A'. What would cause that? To make matters worse, the tyre purchase websites often get it wrong. So I've seen the same identical tyre from two sites with completely different ratings.
 
Marauder said:
I was quoted just over £100 each for Hankook Vantra LT RA18 ( are they different from Lantra ?) from McConnechy's in Perth.

Load rating on Vantra LT RA18 is 107. = 1030 Kg (so the tyre guy told me). 2 on axle =2060kg.

Lenny's 10% (of 2060) = 206kg 2060+206 = 2266Kg

So these tyres can carry 210kg in excess of my max axle load. (or have I got it completely wrong)

my front axle is rated 1850max.

or does it mean 1850 + 10% = 2035kg


I'm getting confused now, maths never was my strongest point !!

Someone check my maths pls ?

Steve
Click to expand...

I don't know what this 10% thing is. A 107 tyre is good for 975kg, or an axle load of 1950kg. Your axle is rated for 1850kg so is fine for that axle.

However, you need to check the rear axle load, too, as these tyres might end up on there as you rotate tyres, or attempt to get the same brand all round and the rear axle load is normally higher than the front.

Often manufacturers can supply the same size tyre in different load ratings, too and you need to check the specific tyre listing on the website to be sure you're getting what you expect. Often, the higher load rating is cheaper as people choose it more often, giving economy of scale. For peace of mind, you can go higher with load ratings (never lower). However, don't go super high, or the ride will be poor.

If a tyre is quoted with two load ratings (i.e. 112/109), the higher one applies. The lower one is when fitted in pairs on a dual rear wheel vehicle.

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Marauder said:
Lenny HB said he likes to go 10% over, as a safety margin.
Click to expand...

Although it is rare to find suitable tyres to do this without upsizing the rims, or at least the tyre width. Manufacturers build to a price and rarely give such an opportunity by specifying tyre sizes that would allow such a margin.

Occasionally though, tyre manufacturers do come up with an unusually high load margin for a particular size. I remember a spread from 107 to 120 (975kg - 1400kg) on a particular size, but this is rare. For many sizes there are only one or two load ratings available.
 
Any thoughts on BridgeStone Duravis tyre ?

Has good ratings for economy and wet grip . .
 
Marauder said:
what is "offset axle loading" pls ?
Click to expand...

He means that you might load it such that (or the static weight distribution already means that) more weight is on the left or right hand side of the vehicle, potentially overloading the tyre on that side, rather than the weight being distributed evenly.

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cmcardle75 said:
He means that you might load it such that (or the static weight distribution already means that) more weight is on the left or right hand side of the vehicle, potentially overloading the tyre on that side, rather than the weight being distributed evenly.
Click to expand...
Ok, I see. I not thought of that. Maybe that's why Lenny's 10% idea
 
dunnah01 said:
A 107 is only 975kg so max axle would be 1950kg. If your max axle is 2056kg?then I'd be looking at least a 112 rating to allow for offset axle loading.
Click to expand...
My van currently has Agilis, CP which are rated 109. All the tyres (215/70/R15) I have been looking at are around the same (about 107/109).

so how could I get a 112 rating ?

Would I have to put wider tyres on my existing rims ?
 
Marauder said:
Do you mean tyre size (eg 215/70/15), or tyre brand/model (eg Bridgestone Duravis)
Click to expand...

I mean if you take a particular size, i.e. 215/70 R15, you will find across all manufacturers only a few common load ratings.

For that size, I see the vast majority are rated at 109. This would be written as 215/70 R15 (109). There are also some 215/70 R15 (98). It is likely that these are for different markets. The 109 is a "light truck" tyre and the 98 will be a "car" tyre.

I literally have been unable to find a "light truck" tyre in that size that is not a 109 rating. Therefore, if you wanted your 10% margin and the 109 did not provide it, then your choices would be to find a slightly wider tyre, or get larger rims.

For example, a 225/70 R15 is typically available in 112 rating and are likely to fit on the existing rims without rubbing. If you go for 16 inch, you could have a 225/75 R16 for 121, but this will be significantly larger and you might have clearance issues. Smaller sizes are available, but with corresponding decreases in load ratings.

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cmcardle75 said:
your choices would be to find a slightly wider tyre
Click to expand...
That would give more grip, but probably worse fuel economy, more noise ?

And why would the original manufacturer specifications be inadequate ?
 
Marauder said:
That would give more grip, but probably worse fuel economy, more noise ?

And why would the original manufacturer specifications be inadequate ?
Click to expand...
If you post a picture of the weight plate from the engine slam panel showing the max axle weights then the clever bods can probably recommend the best tyre for you.
 
Marauder said:
That would give more grip, but probably worse fuel economy, more noise ?

And why would the original manufacturer specifications be inadequate ?
Click to expand...

They're not. If was just the introduction of this 10% margin. I wouldn't bother myself. I'll take the heavier tyres if they're available. If they're not, I'll take anything that legally meets the axle loading.
 
My Laden Plate !
 

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By the way - Thanks everyone

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I decided to go up a rating with my new tyres, from 110/108 to 113/111 as i reckoned my van was always up near it's maximum weight.
 
Marauder said:
My Laden Plate !
Click to expand...
Yes, with that rear axle, 108 is the minimum load rating. I notice from your original post that you mentioned 107 allowing 1030kg. This is actually the loading for 109, so I suspect that was the actual rating of the Hankook Vantra LT RA18 offered, which is definitely available as a 109.

Fundamentally, your choice is to buy more 109s or go for 225 wide tyres at 112, which will technically be a modification, although one that most insurance companies would probably accept as no additional charge. For the rear axle, a 109 tyre would be a 3% overrating. A 112 tyre would be a 12% overrating.
 
If you are very careful with payload something like

TOYO NANOENERGY VAN 215/70 15 as a 109 tyre may be a good compromise from a respected brand​

 
dunnah01 said:
If you are very careful with payload something like

TOYO NANOENERGY VAN 215/70 15 as a 109 tyre may be a good compromise from a respected brand​

Click to expand...
I posted a link to them earlier, the Nexen’s won the toss. 👌🏻
 
cmcardle75 said:
Yes, with that rear axle, 108 is the minimum load rating. I notice from your original post that you mentioned 107 allowing 1030kg. This is actually the loading for 109, so I suspect that was the actual rating of the Hankook Vantra LT RA18 offered, which is definitely available as a 109.

Fundamentally, your choice is to buy more 109s or go for 225 wide tyres at 112, which will technically be a modification, although one that most insurance companies would probably accept as no additional charge. For the rear axle, a 109 tyre would be a 3% overrating. A 112 tyre would be a 12% overrating.
Click to expand...
But can I mix 109 on the front, and 112 on the back ?

Buying 5 new would blanch a little

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