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So finally Hawthorn Tyrepower got back to me with a quote:

For Michelin Pilot PS2 255/40/R18s, $481 per tyre = $1924

vs ordering off Tire-Rack: $1147 + $300 shipping + 100 fitment/balancing = $1550 AUD

Looking at the Tire Rack site, it sounds like 255s are better suited than 245s for the standard 9.0" wide 34GTR rims as they have 9.0 vs 8.5" "measuring rim width".

"The measuring rim width is the industry standardized rim width upon which the tire must be mounted in order to confirm it meets its dimensional targets. Because the width of the rim will influence the width of the tire, a standard rim width for every tire size is assigned and must be used. This standardized measuring rim width allows all of the tires produced around the world to meet the same dimensional standards and therefore, be equivalent with regards to their physical size. The measuring rim width is sometimes referred to as the tire's "design rim width."

In terms of cheaper tyres like the Sumitomo, because shipping's the same price, it is more cost effective to get expensive tyres than cheaper ones for me, so I think I'll stick with PS2s.

i just got kuhmo ku31s allround for my gtr, currently on 330kws and they hold the power very well in wet and dry

unlike the federals ss i had on previously, and best of all i got them through tempe tyres in sydney for 800 delivered to

my front door (melb)

thats for 265x35x18

Thats bloody cheap. I reckon you cant go wrong with the KU31/36 seriously for their price.

bridgestone protenza RE001's

Looking at these also but thinking whether the extra 1k you spend can be justified or not.

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