Log in

View Full Version : Is this size tyre legal for D3 (QLD)


sheckster
6th March 2010, 08:19 PM
265/60R18 110H (Scorpion STR) (QLD)

thanks
Mudsloth
6th March 2010, 08:35 PM
265/60R18 110H (Scorpion STR) (QLD)

thanks

Well, i don't know how to translate the numbers but i'm on 37inch by 12.5 inch by 15 and never had a problem.
sniegy
6th March 2010, 08:41 PM
I think it is ok, from memory it is now 15mm maximum, so from original (i can take as a guess an SE) 255/60/18 std, to 265 is only 10mm difference.
Someone will chime in with the legalities..

Cheers
WhiteD3
6th March 2010, 08:47 PM
I "think" the 15mm rule is for low profile tyres. Have a read of this.....
seano87
6th March 2010, 09:12 PM
I think it is ok, from memory it is now 15mm maximum, so from original (i can take as a guess an SE) 255/60/18 std, to 265 is only 10mm difference.
Someone will chime in with the legalities..

Cheers

Not quite as simple as only 10mm difference. 15 mm refers to overall increase in tyre diameter - the difference in overall diameter between a 255/60 and a 265/60 is not 10mm.

255 x 60% = 153mm, then x2 cos there are 2 sidewalls = 306mm
Add in the rim - 18" = 450mm
Total = 756mm total diameter

265 x 60% = 159mm
x 2 = 318
+ Rim (450mm) = 768mm - so 12mm difference, which is within the 15mm.

Note that each manufactures 255/60 R18 will be different to the next - most are not exact, some some may be more than 15mm difference in diameter.

Hope that clears up the way sizes actually work a little bit...
300+
7th March 2010, 12:45 AM
Try this:
Tire size calculator (http://www.miata.net/garage/tirecalc.html)

It saves all the mental arithmetic.

255/60/18 =763mm
265/60/18 =775mm

Whilst the regs are written from the point of view of someone fitting a larger diameter rim but lower profile tyre the +15mm rule is clear and would apply to all.

So 265/60 are fine if you can get them.

Cheers, Steve
rmp
7th March 2010, 06:34 AM
There are many tyre size threads already. Please refer to one of those, and it will say how to work out sizes, and that you must refer to your state's regulations as each state differs. The 15mm rule doesn't apply to all states.

In general some attempt to help yourself before you ask for assistance would be appreciated.