Trailer tyre choices





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  1. #1
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    Default Trailer tyre choices

    hi guys, can anyone give me some advice on trailer tyres?

    I have a large trailer with double axle as in pic. it weighs 500kg empty and currently has 165R13C - commercial tyres on it

    do i really need to replace tyres with commercial tyres? or can i fit std 165/80 13 tyres? I do realise the commercial tyres are able to carry heavier loads, but i move model aeroplanes with it doubt i ever get 500kg loaded in it even when moving other goods......

    so 4 std tyres might have 1000kg with trailer and load combined - way less than any car of same size? or am i missing something?
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  2. #2
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    Default Re: Trailer tyre choices

    Whatever tyre you put on the trailer MUST not render the trailer unroadworthy. Your current tyres are load rated approx 620kg each. The (rule-of-thumb) formula for selecting tyres is that the GVM of the trailer must not exceed 70% of the TOTAL rated load-carrying capacity of ALL the tyres on the trailer. The 13" commercial (rated at 620kg each) on your trailer and can therefor carry (4x 620kg =) 2480kg x 70% = 1736kg GVM. Now have a look at what it says on the trailer registration plate attached to the chassis, what is the GVM ? It does not matter whether you are currently transporting marshmallows, if the GVM requires 4x tyres rated at minimum 600kg each, then that is what you need to fit. As things stand your tyres would be legal for a trailer with 1700kg GVM i.e. a loaded trailer.If your GVM is 1000kg then 4x 155/80R13 will do the job...it is rated at 437kg thus (437 x 4 =) 1748kg x 70% = 1223kg....165/80R13 will be even better.If your GVM is 1350kg then 4x 155/80R13 will not be suitable, but 165/80R13 will have to be fitted because it's rated at 487kg thus (487 x 4 =) 1948kg x 70% = 1363kg.If your GVM is 1500kg then 13 inch passenger tyres will not do the trick. Hope this helps, good luck!
    Last edited by Bullterrier; 2019/02/27 at 02:51 PM. Reason: paragr

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  4. #3
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    Default Re: Trailer tyre choices

    thanks so much! thats exactly what i was looking for.

    i found some Commercial tyres 8 ply and a 92 load rating at just R750 each

  5. #4
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    Default Re: Trailer tyre choices

    Fantastic hobby that you have Clive. Envy you.
    What about some pics now that you have the trailer problem sorted out?
    Toyota Fortuner 2.8 GD6. 4x4
    RAV4 VX
    Bush Lapa Vlooi 039

  6. #5
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    Default Re: Trailer tyre choices

    Quote Originally Posted by Bullterrier View Post
    Whatever tyre you put on the trailer MUST not render the trailer unroadworthy. Your current tyres are load rated approx 620kg each. The (rule-of-thumb) formula for selecting tyres is that the GVM of the trailer must not exceed 70% of the TOTAL rated load-carrying capacity of ALL the tyres on the trailer. The 13" commercial (rated at 620kg each) on your trailer and can therefor carry (4x 620kg =) 2480kg x 70% = 1736kg GVM. Now have a look at what it says on the trailer registration plate attached to the chassis, what is the GVM ? It does not matter whether you are currently transporting marshmallows, if the GVM requires 4x tyres rated at minimum 600kg each, then that is what you need to fit. As things stand your tyres would be legal for a trailer with 1700kg GVM i.e. a loaded trailer.If your GVM is 1000kg then 4x 155/80R13 will do the job...it is rated at 437kg thus (437 x 4 =) 1748kg x 70% = 1223kg....165/80R13 will be even better.If your GVM is 1350kg then 4x 155/80R13 will not be suitable, but 165/80R13 will have to be fitted because it's rated at 487kg thus (487 x 4 =) 1948kg x 70% = 1363kg.If your GVM is 1500kg then 13 inch passenger tyres will not do the trick. Hope this helps, good luck!
    Damn good answer

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