Learning about tyres

Submitted: Tuesday, Mar 25, 2003 at 19:51
ThreadID: 4048 Views:1337 Replies:3 FollowUps:1
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I would greatly appreciate if someone could explain in relatively simple terms the tyre ratings "N", "S" etc and maximum load on each tyres and things like that. I have just got a 4.2TD GU and it is currently fitted with 265/75/16s. I am looking at a new set of tyres and wondered if 285/75/16s are in line with the manufacturers and ADR. What tyre rating am I looking for as well. Any info appreciated. Cheers, PHIL.
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Reply By: diamond - Tuesday, Mar 25, 2003 at 21:06

Tuesday, Mar 25, 2003 at 21:06
ok in as simple terms as i can the letter you see on your tyres n/s ect is your speed rating that the tyre is designed to be able to run at. n 140ks and s 180ks as for the tyre upgrade im not sure what the laws is where you are im in vic and the law here says no more than 15 mm increase in overall diameter of the tyre originally fitted or available as an option on your 4wd . i im pretty sure most gu came out with 265/7016 an an option of 265/75/16 easiest way is to look at your tyre placard fitted to your car usually in side the r/h/f door frame or glove box and find the biggest size tyre there then you can work out how much biger you can go.eg a 265/70/16 has an overall diameter of 772mm a 265/75/16 has an o/d of 800mm now a 285/75/16 has a o/d of 834mm so at least in vic theese tyres are considered illegal hope i didnt confuse you to much.
AnswerID: 16098

Follow Up By: Phil - Wednesday, Mar 26, 2003 at 07:51

Wednesday, Mar 26, 2003 at 07:51
Thanks, I understand most of that!! What other speed ratings are there? I believe "Q" is one. I will make some inquiries with Nissan. Thanks for your time, Cheers, Phil
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FollowupID: 9879

Reply By: Member - Colin- Wednesday, Mar 26, 2003 at 11:22

Wednesday, Mar 26, 2003 at 11:22
http://www.tyresave.co.uk/tyrspeed.html
or
http://www.4wdworld.com.au/tipstricks/tireterm_O4.htm

this diagram may help - on later model cars there is a 'sticker' which tells you what the speed rating is for that car.

Also, download the 'google' search engine - http://www.google.com.au/ - the 'answers' will usually resolve most questions - ie. I typed in "tyre ratings" for the webs above. Colin - Subaru Forester
AnswerID: 16151

Reply By: Member - NOBBY - Friday, Mar 28, 2003 at 09:48

Friday, Mar 28, 2003 at 09:48
Phil .. my understanding of tyres ( which is very limited ) is that the numbers etc on them equate to: eg.. P205/65R15
P.. Passenger vehicle
C or LT.. Commercial/ light truck
205.. Width of tyre in mm
65.. Sidewall height is 65% of section width
R.. radial
15 .. Wheel diameter in inches
speed ratings are.. s.. 180k, h.. 210k, v.. 240k, z.. over 240k

Hope this helps. All this still doesn't guantaree milage or handling
AnswerID: 16311

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