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Quote: Originally posted by marg6 on 27/11/2021

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sorry but this makes no sense at all, its way to hard to read and understand what on earth he is saying

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Quote: Originally posted by jadatis on 26/11/2021

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As first 185R14 102Q ( or higher speedcode) or 104N " for trailer use only" .
Sometimes given as 185/80R14
Can be used for every sise with 102Q or 104N AT 65psi, found 195/70R14 only in 104N AT 65psi, so this list also can be used for that sise.
These are called D-load/ 8 plyrated
The 185R14 also exists in XL/extraload /reinforced 95Q AT 44psi and 94Q AT 42psi, and normal car tyre 90Q AT 36 or 35psi, and probably also in "for trailer use only " with 2LI steps higher, but for those I will make seperate lists.


For trailer use only" has 2 loadindex steps higher then Q or more speedrated or higher ( R,S,T,H,V) because N speedrated is for max speed 140kmph/87mph calculated in max load. Q and Higher maxload is calculated for 160kmph/99mph, so lesser deflection.
But I calculate also the 104N as if it was a 102Q, to give it the same deflection as Q.

Use the list like this.
Determine the total weigt of Caravan.
Best is to weigh it per wheel and towbarweight and add this up.
Secondbest per axle or off the car in total on a public weightscale. In lack of that use the maximum permissable totalweight, or what it is called in the UK. But realise that many caravans are overloaded.

Then look this determined total weight back in the list, and read the pressure in front of it.
Example totalweight 1600kg.
66psi gives 1616kg, so yust above, use 66psi.
But because maximum reserve 65psi can do with 1593kg, only 7kg less.

Also above the referencepressure of 65 psi for this tyre is given, so if it comes to that, it says something about the poor reserve of tyre, or overloading, but you better use it for maximum reserve.
Not allowed anymore, unless the tyremaker also puts a maximum inflation pressure on sidewall like brands in the Continental groop do, then always 10 psi higher so here 75psi.
Mother nature though allowes it.


44     psi     /     1113     kg     /     45     kg on towbar
45     psi     /     1136     kg     /     45     kg on towbar
46     psi     /     1159     kg     /     46     kg on towbar
47     psi     /     1182     kg     /     47     kg on towbar
48     psi     /     1205     kg     /     48     kg on towbar
49     psi     /     1228     kg     /     49     kg on towbar
50     psi     /     1251     kg     /     50     kg on towbar
51     psi     /     1274     kg     /     51     kg on towbar
52     psi     /     1297     kg     /     52     kg on towbar
53     psi     /     1320     kg     /     53     kg on towbar
54     psi     /     1343     kg     /     54     kg on towbar
55     psi     /     1366     kg     /     55     kg on towbar
56     psi     /     1389     kg     /     56     kg on towbar
57     psi     /     1411     kg     /     56     kg on towbar
58     psi     /     1434     kg     /     57     kg on towbar
59     psi     /     1457     kg     /     58     kg on towbar
60     psi     /     1480     kg     /     59     kg on towbar
61     psi     /     1503     kg     /     60     kg on towbar
62     psi     /     1525     kg     /     61     kg on towbar
63     psi     /     1548     kg     /     62     kg on towbar
64     psi     /     1571     kg     /     63     kg on towbar
65     psi     /     1593     kg     /     64     kg on towbar

66     psi     /     1616     kg     /     65     kg on towbar
67     psi     /     1639     kg     /     66     kg on towbar
68     psi     /     1661     kg     /     66     kg on towbar
69     psi     /     1684     kg     /     67     kg on towbar
70     psi     /     1706     kg     /     68     kg on towbar
71     psi     /     1729     kg     /     69     kg on towbar
72     psi     /     1751     kg     /     70     kg on towbar
73     psi     /     1774     kg     /     71     kg on towbar
74     psi     /     1796     kg     /     72     kg on towbar
75     psi     /     1819     kg     /     73     kg on towbar
76     psi     /     1841     kg     /     74     kg on towbar
77     psi     /     1864     kg     /     75     kg on towbar

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