Ok, the last paragraph of the notice I find interesting.Quote:
Originally Posted by jonesy63
Does it imply that if you fit "winter" or M&S (off road) tyres you can go for lower speed ratings (less than H) ??
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Ok, the last paragraph of the notice I find interesting.Quote:
Originally Posted by jonesy63
Does it imply that if you fit "winter" or M&S (off road) tyres you can go for lower speed ratings (less than H) ??
I think it is just warning you that specialist tyres may have a very low speed rating and that you should check what it is before driving.
For example, a Q speed rated tyre is only approved for up to 160KM/H. The D3 can exceed that, laws aside. So if you fit Q rated snow tyres don't drive over 160.
It is a nice thing to read on a tyre placard, as otherwise you could be limited to the factory fitted speed rating of H (210 KPH).
Cheers, Steve
BUT, have a good look at your tyres...Quote:
Originally Posted by 300+
My Dueller H/T (unwanted replacments) actually have on examination "M+S" imprinted on the sidewall (close to the rim). I decided to have a look at ALL the 4wd's in the building where I live in Cairns last night, ALL have similar, so it does get you wondering.....
I am not sure about ohter states however QLD legislation is as follows;
The speed rating of all tyres must be:
a speed of at least
for an off-road passenger vehicle - 140km/h
Load ratings of tyres must be at least equal to thos specified by the manufacturer on the tyre placard fitted to vehicles made after 1972.
Tyres can be up to 1.5 times the width of the manufacturers widest option as long as wheel track is not increased by more than 50mm and tyres are within guards / flares.
Tyres width can never be less than narrowest manufacturer tyre.
In QLD tyre size also can not be increased by more than 15mm over manufacturers maximum tyre size on placard.
The M + S rating is relevent in the US where there is snow, Authorities mandate that vehicles must have mud and snow rated tyres in winter.
I dont think it has much to do with capability though.
From some random website:
If a tire has MS, M+S, M/S or M&S on it, then it meets the Rubber Manufacturers Association (RMA) guidelines for a mud and snow tire. For a tire to receive the Mud and Snow designation, it must meet these geometric requirements (taken from the bulletin "RMA Snow Tire Definitions for Passenger and Light Truck (LT) Tires"):
1. New tire treads shall have multiple pockets or slots in at least one tread edge that meet the following dimensional requirements based on mold dimensions:
a. Extend toward the tread center at least 1/2 inch from the footprint edge, measured perpendicularly to the tread centerline.
b. A minimum cross-sectional width of 1/16 inch.
c. Edges of pockets or slots at angles between 35 and 90 degrees from the direction of travel.
2. The new tire tread contact surface void area will be a minimum of 25 percent based on mold dimensions.
The rough translation of this specification is that the tire must have a row of fairly big grooves that start at the edge of the tread and extend toward the center of the tire. Also, at least 25 percent of the surface area must be grooves.
Severe winter traction icon
The idea is to give the tread pattern enough void space so that it can bite through the snow and get traction. However, as you can see from the specification, there is no testing involved.
Regards,
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