Will 245/40/18 fit on lowered Rdstr. running 225's now LOOK like might be room.
06-19-2008, 12:11 PM
#4
you should match tire width with your horsepower. If you are stock, stick with 225. If Chipped, 255
Ok I'm kidding - otherwise a lot of my cars will need 100 width tires 
But seriously, 245/40 is a bit too tall as an 18. When going 70mph on the speedo, your road speed is almost 73mph.
You should try 245/35 but that limits your tire brand choices to something like Toyo and a few others - although you'll be happy with their performance. Another alternative is fit 255/35's which are about as big as 235/40's but are available by many manufacturers. You'll only be off by 1.5mph @ 70mph but that's not too bad.
But seriously, 245/40 is a bit too tall as an 18. When going 70mph on the speedo, your road speed is almost 73mph.
You should try 245/35 but that limits your tire brand choices to something like Toyo and a few others - although you'll be happy with their performance. Another alternative is fit 255/35's which are about as big as 235/40's but are available by many manufacturers. You'll only be off by 1.5mph @ 70mph but that's not too bad.
06-19-2008, 02:53 PM
#5
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It depends on the tires, there is a lot of variance from brand to brand...
And the suspension you are lowered with ... and your offset ... and how much you weight ... ;^)
I'm running 235/40-18 without any probs.
I'm running 235/40-18 without any probs.
06-19-2008, 06:49 PM
#6
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I am running 245 40R18's on 8.5 with 35 BS and 15mm spacers.>>
Lowered about 1.5". Rubs on the inside without spacers. Rubs with the spacers on the rear wheel well when I push it hard. I was going to raise my suspension soon. Probably about 1/2". You will likely rub your outer fender on compression with those spacers.
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