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245/40-17 or 245/45-17...which would you choose?


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Well its that time again. Time for new tires on my new wheels and I am debating over a 25" tall tire or a 26" tall tire (40 and 45 series respectively). I have looked at countless pics and threads to help me decide but I am still unsure.

 

I am unfamiliar with clearance of a 26" tire on a very low car...and I am unfamiliar with how much the 1/4" shorter sidewall will truly effect the ride quality and straight line traction on such a light car.

 

What would you do?

 

My car - 71 240Z, Chev 350, 700r4 auto tranny, 17x8" Centerlines, 225f/250r 8" coilovers with illuminas.

 

This is a street car so Im trying to keep the ride tolerable but get as much cornering grip out of it as possible for canyons and some closed course stuff.

 

Jason

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Have you considered using your current sized tires as a comparison in what your new speed/rpm ratio would be compared to what it is now? it woud only be a 100 or so rpm difference between these two above, but I'd shoot for the shorter tire. They look more suited on the S30, and if your shock valving is good, the shorter sidewall difference won't be noticable.

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