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To the Guru's

Trying to decide between going 255/35/18 vs 255/40/18 all round on my s15, also trying to decide what the best rubber is for me max $400 a tyre. 1st choice so far is the goodyear f1 gs-d3's 2nd choice is the falken rt615. Need some good input here guys!

Regards,

Albert

You need to find out which has the closest rolling diameter to your stock rim/wheel combo so

1. its legal (in Qld ur only allowed no more than 15mm difference)

2. doesn't stuff up ur speedo

So check your stock tyre profile and compare it in this website with the two profiles ur choosing from

http://www.1010tires.com/TireSizeCalculator.asp

I would choose the 255/35 as it's very close to the stock rolling diameter. And there is a big difference in tyres between the RT615 and GS-D3. The Falken is more of a motorsports tyre (not quite an R-compound though) compared to the Goodyear which is just a street tyre. You have to decide whether you want your tyres to last longer or have more grip.

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