I need to lose weight!!

[cmcardle75]

If that were the case, then why would they put 116 load rated tyres on these wheels on later 4.5 ton and 5 ton motorhomes.

I know AT ran 1250kg tyres on an 2500 axle (rather stupid with no lee-way at all), but surely they wouldn't fit alloys that are only rated at the same as the maximum axle load - would they? That sounds like total incompetence to me.

No. It is completely normal. Any required safety margin is already built in. Whilst some feel happier to add their own additional safety on top, there is no need to and it is certainly not incompetent not to do so.

 

[Jonno1103]

If that were the case, then why would they put 116 load rated tyres on these wheels on later 4.5 ton and 5 ton motorhomes.

I know AT ran 1250kg tyres on an 2500 axle (rather stupid with no lee-way at all), but surely they wouldn't fit alloys that are only rated at the same as the maximum axle load - would they? That sounds like total incompetence to me.

116 rated tyres gives over 5000kg - 5000.4kg. 116s are fine for four wheeled 4500kg motorhomes and AT 5 tonners are tag axle so you have 4 alloys on two rear axles with a combined load rating of 7200kg with 4 tyres rated for 5000.4kg.

Overall a 5000kg AT motorhome has 6 alloys with a combined load rating upto 10800kg and 6 tyres at 116 load rated for 7500.6 kg.

How is that in anyway incompetent?

 

[TR5]

116 rated tyres gives over 5000kg - 5000.4kg. 116s are fine for four wheeled 4500kg motorhomes and AT 5 tonners are tag axle so you have 4 alloys on two rear axles with a combined load rating of 7200kg with 4 tyres rated for 5000.4kg.

Overall a 5000kg AT motorhome has 6 alloys with a combined load rating upto 10800kg and 6 tyres at 116 load rated for 7500.6 kg.

How is that in anyway incompetent?

If you look at the Tyresafe website it states that the load index on tyres should be at least 10% above the maximum load you can put on the tyre. If an axle maximum load is 2500kg, which 4 wheeled Frontiers with Alko chassis are, and has load index tyres of 116 (1250kg per tyre), they are potentially at 100% or their maximum load. If the axle is overloaded by any amount, then so are the tyres serving it. It goes against the recommendations of Tyresafe. That is incompetent in my book. There are 118 load rated CP tyres available, these should be fitted at the very least.

From Tyresafe ... "It is advisable to ensure the total vehicle operating weight is below the specified maximum limit, and a margin of 10% will partly compensate for some unequal load distribution." This is referring to the load index of the tyre. An axle rated at 2500kg with two 1250kg tyres fitted has 0 margin!

However, my original question was asking what the load limit is per each alloy wheel fitted, as someone asked about uprating a 2500kg axle to 2700kg, and were told they need to change the tyres AND wheels.

 

[TR5]

I think it’s cos they’re rated at 1250kg which across one axle is total 2500 and if you upgrade to say 2700kg axle weight they’re not suited to higher weight That’s my thinking anyhow.
Here’s a thing, say I uprate using steel wheels and 121 tyres to 2700 on rear and get the paperwork and plate, then refit the alloys ensuring I NEVER run ANY axle above 2500kg then the alloys are ok? Yes??

But are the alloys rated at 1250kg - tyres, if 116 yes, but I was interested to know what the load limit on the alloys are.

 

[TR5]

Your looking at around 1800kg max on a single 16 inch alloy. At 121 you've got a limit of 1450kg on each corner. I take it you have 225/75 R16's?

Then why would you have to change the alloys if uprating an axle from 2500kg to 2700kg = 1350kg per wheel?
Yes I'm running 225/75/R16 121 Agilis CrossClimates - but I'm interested in the recommended max. usable load per alloy wheel.

I have no intention of upgrading mine, I don't need it, but just interested why someone was told to change their alloy wheels if upgrading from 2500kg to 2700kg on the rear axle, that's all.

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[Lenny HB]

Then why would you have to change the alloys if uprating an axle from 2500kg to 2700kg = 1350kg per wheel?
Yes I'm running 225/75/R16 121 Agilis CrossClimates - but I'm interested in the recommended max. usable load per alloy wheel.

I have no intention of upgrading mine, I don't need it, but just interested why someone was told to change their alloy wheels if upgrading from 2500kg to 2700kg on the rear axle, that's all.

The Fiat alloys are only rated at 1250kg.

 

[Jamesh]

If you look at the Tyresafe website it states that the load index on tyres should be at least 10% above the maximum load you can put on the tyre. If an axle maximum load is 2500kg, which 4 wheeled Frontiers with Alko chassis are, and has load index tyres of 116 (1250kg per tyre), they are potentially at 100% or their maximum load. If the axle is overloaded by any amount, then so are the tyres serving it. It goes against the recommendations of Tyresafe. That is incompetent in my book. There are 118 load rated CP tyres available, these should be fitted at the very least.

From Tyresafe ... "It is advisable to ensure the total vehicle operating weight is below the specified maximum limit, and a margin of 10% will partly compensate for some unequal load distribution." This is referring to the load index of the tyre. An axle rated at 2500kg with two 1250kg tyres fitted has 0 margin!

However, my original question was asking what the load limit is per each alloy wheel fitted, as someone asked about uprating a 2500kg axle to 2700kg, and were told they need to change the tyres AND wheels.

A 1250kg tyre already has a safety margin....
It's not going to pop at 1251kg therefore you don't need a higher rated tyre unless you like hard ride!

 

[TR5]

A 1250kg tyre already has a safety margin....
It's not going to pop at 1251kg therefore you don't need a higher rated tyre unless you like hard ride!

A higher rated tyre doesn't give you a harder ride - in fact the opposite, as the recommended pressure for that tyre is a little less.