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Caravan Tyres - Load Index


Yossa

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Due to hitting some debri on the M25, we are having to replace the vans' tyres.

 

The original tyres fitted to the van (from new) are 195/70R 14 96N. The 96N indicates a Load Index (96) of 710Kg and a speed rating (N) of 87mph.

 

If you multiply the load rating by two, in order to get the combined load-carrying capacity, you get 1420Kg which seems all well and good as the MTPLM of the van is 1345Kg.

 

BUT as I understand it, the tyre manufactures recommend that the MTPLM should not exceed 90% of the tyres' combined load-carrying capacity. Therefore the LI for each tyre should ideally be 98 (750Kg) giving a combined load rating of 1500Kg, 90% of which is 1350Kg.

 

Now I'm no expert in these matters so I would be grateful for members opinions on the subject.

 

Yossa

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The Caravn and light trailer industry can, if required, go 10% over the stated load capacity if the speed is restricted to 60 mph. That is fine in the UK if you observe the limit but no good if you go to France where you can do 70mph. That, I believe is where your figure of 90% comes from. Caravan makers have now come into line and fit tyres suitable for going abroad but the light trailer industry still uses this extra 10% allowance.

 

You should, therefore, be perfectly OK in replacing your tyres with ones of similar load and speed ratings as per the originals.

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Further to Brian's reply, my understanding is that if you tow in France your tyre must be capable of towing at the maximum speed, 130kms. Not sure I would want to go that fast with a van on the back!!! However there is the possibility(however remote) of a fine if your tyres don't match this requirement. The last time I replaced tyre on a van I purchased Commerial van tyres as they were recommended by the supplier for caravans. I also had to go to a tyre retailer capable of dealing with Tyron Safety Bands.

 

David

David - Milton Keynes

Bailey Alliance 66-2 Motorhome for holidays and a Kia Venga for home.

 

Caravan Travels

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My caravan has a MTPLM of 1400kg and the load/speed index is 102N

 

I believe this is 850kg at 140km/h.

 

That puts the limit for the two tyres at 1700kg which seems a reasonable safety margin to me.

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The recommendation from the tyre industry is you use a tyre with a load index 10% higher than the actual load, this is because they "suffer more"?. On the subject of the 'Bonus load' for running a tyre at less than it's maximum speed it tends to sit on the fence, they say if you go abroad then you should not use this bonus because of higher speed limits and anyway caravan manufactures tend not to do this anymore.

Bailey for one seem to be doing it as they sell caravans weighing 1400kg on two tyres with a combined load of 1400kg, so take it off with one hand and but it back with the other!! :rolleyes:

gary1s.gif

 

Arc Systems are specialist Carver caravan product repairers, committed to providing a comprehensive service as well as spare parts for these popular heaters.

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My caravan has a MTPLM of 1400kg and the load/speed index is 102N

 

I believe this is 850kg at 140km/h.

 

That puts the limit for the two tyres at 1700kg which seems a reasonable safety margin to me.

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Your information is spot on and it gives you a really big safety margin of 21%!

 

Yossa

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