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Discussion Starter · #1 ·
I have a 74 260 which needs new tires and wheels. Original owner and I like the look and profile of the 185/70/14s, however alot of the new wheels in 14 are x7s. This would require going to a 60. How much wider is a 60 than a 70? If I go to a 7 wide wheel, should I go up to a 15. And if 15 should I go 195, 205???? I'm so confussed. OK, What looks and rides the best?
 

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You have several options here which could cause even more confusion.
First - the 195/70-14 is probably the tire the 260 came with originally so you are a bit undersized with the 185's.
Options that will allow you other possible tire sizes without having to change your speedometer calibration would be 205/60-15, 205/55-16 or 225/50-16, or 225/40-17. In any case you can run up to a 7 wide wheel and it will fit under your stock wheel wells and rotate to all four corners. The key to the Z wheel is the offset or backspacing. This is the location of the mounting surface in relation to the rim. On a 7 wide wheel with the mounting surface exactly in the center of the wheel it would have a 0 offset or 3 1/2 backspacing. The suspension is designed for 0 offset wheels but can tolerate a little without acting too badly. that is no problem for 7 wheels and the tire I listed above for 14 & 15 sizes and the 205/55-16's. For the 225/50-16 & 225/40-17 series you should probably use 3 5/8 backspacing instead of 3 1/2 to ensure the tires will clear the inside lip of the rear fender wells. The 14 & 15 wheels can probably be obtained used off salvage yared 280ZX's. The 16 & 17 will end up costing you at least $200 each new.
 

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The second number in the size has nothing to do with width. It is a percentage of the first number, which is the width of the tread, and tells you the sidewall height or profile. ex. My tires 205/60/14, are smaller in diameter even though they are much wider than the original 175/70/14. Ride does get harsher as the aspect ratio gets smaller (second number), but handling improves. Unless you go to a larger wheel size the car may look funny if it isn't lowered, and the speedometer will not be accurate. Your local tire dealer should have a chart to get you to the correct diameter (Phantoms post has some examples) and a correct range for width of wheels to use with each tire.
 

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Discussion Starter · #4 ·
I just wanted to tell you to go to Discount Tire Co. not only do I iwork there but they really do know what they are talking about.
 
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