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Tyre ratings

Discussion in 'Bling and Appearance' at netrider.net.au started by demuire, Mar 19, 2009.

  1. Had a bit of a look around and couldn't find the answer, so thought I'd post up a new post.



    I'm starting to look into tyre options for my Versys, the OEM tyres are wearing out. From memory the stock tyres are Dunlop D221 Sportmax, which is a ZR rated tyre.

    Is it true that by law when replacing these tyres I have to get another Z rated tyre? Or can I drop down to a H rated tyre (of the same size)? I'm looking for something a bit more dual-sporty and there really isn't much in the Z rated category...

    Thanks
     
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  2. In WA (and I think our rule is based on the national Australian Vehicle Standards framework), you can fit a lower speed rated tyre but must retain the same load rating.

    We also had this one out with the insurance companies when I was with Transport here, and they backed down on using lower speed ratings as an excuse to disallow claims on grounds of unroadworthiness.

    Check with your local RTA.
     
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  3. From the RTA Vehicle Standards Information

    So H rated is fine as is any of N,P,Q,R,S,T,U,V,W,X,Y,Z.

    PatB is correct with load rating



     
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  4. That sounds about right. In this day and age in Australia, I would be very surprised if you could find a road legal tyre for anything other than a moped with a speed rating below 140 km/h. That's even lower than the dash rating i remember from the UK which equated to 93 mph (IIRC), which might have been an imperialised 150 km/h.
     
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  5. Sorry realised afterwards you're in QLD. Here's what the QLD government has to say in their vehicle modification guide:

    So reading that a motorcycle would come under "another motor vehicle" and require only 120km/h speed rating? From the section on motorbike modifications it just says:

    In any regard, the answer to your question is still a H rated tyre is fine.
     
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  6. The question you need to ask yourself is "How often am I going to ride at sustained speeds in excess of 210 km/h?" or whatever the upper limit for H-Rating is. And the answer, for 99.999% of motorcyclists in Australia who aren't bullshitting (a small proportion admittedly) will be never.

    You'll be fine.

    Even S-Rating, which I haven't seen for years, is good for 180, so would be fine for pretty much any sane individual on the road.
     
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