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300ZX (Z31) Brakes, Wheels, Suspension and Chassis Discussions related to performance suspension, wheels, brakes and chassis.

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Old 08-26-2013, 04:48 PM   #1
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New wheels..

Ok i've done my research and haven't found anything else.. I'm running 225/40/18 tires now.. Wanting to go to 205/50/16s.. Stock 88 NA's run 215/60/15... Some people have told me that the 205/50/16s might not clear the brake caliper properly and won't work. Anyway someone could tell me if they would or not? Nowhere else to search..
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Old 08-26-2013, 07:39 PM   #2
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Wheel size and clearance

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Originally Posted by Evan Faris View Post
Ok i've done my research and haven't found anything else.. I'm running 225/40/18 tires now.. Wanting to go to 205/50/16s.. Stock 88 NA's run 215/60/15... Some people have told me that the 205/50/16s might not clear the brake caliper properly and won't work. Anyway someone could tell me if they would or not? Nowhere else to search..
It's actually the reverse, but that would be going from a 15" inch to a 14" inch, but from 15" inch to an 18" no problem. Now going back from 18" inch to 16" inch no problem unless you have done some modification to the front end, such as bump steer spacers, or bigger calipers etc. Other than that you're god to go.
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Old 08-26-2013, 08:58 PM   #3
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Why 205/50R16?

Why 205/50R16? This size is narrower than either stock size and has a rolling circumference more than 3" shorter, which means a smaller contact patch. IF you wish to revert back to a smaller wheel size, I'd use one of the stock sizes. The turbo size has a slightly larger contact patch and slightly shorter side wall, but otherwise there isn't much difference between the 225/50R16 and 215/60R15 tires. The NA cars have a fairly large offset tolerance. Any 7" wide rim with an offset of +20 to +40 should work just fine. To simultaneously compare two tire sizes to one another, use a tire size calculator.

Read ZBUM's information page on wheels and tires to understand what works best for sizes.

Last edited by ken99; 08-26-2013 at 09:02 PM. Reason: Corrected URL
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Old 08-27-2013, 04:26 AM   #4
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Figured it'd be a complete waste of time. Thanks.
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Old 08-27-2013, 08:13 AM   #5
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Gee, I'm sorry. I thought both ZDON and I had provided answers to help you decide which tire size would work best. So...Yes, the 205/50R16 tire will work just fine on your Z31 NA with a stock suspension, provided they are installed on right rims. Look for 16 x 6.5J or 16 x 7.0J wheels, +20 to +40 offset and with a 5x114 bolt pattern.
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Old 08-27-2013, 03:14 PM   #6
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Gee, I'm sorry. I thought both ZDON and I had provided answers to help you decide which tire size would work best.
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Old 08-27-2013, 05:59 PM   #7
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Yes, why bother.
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Old 09-02-2013, 03:47 AM   #8
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Offset determines a lot. Spoke design determines most. Tire size is bullshit number to say if they'll fit or not. 205 is narrower than stock = it will fit. But offset will really be the deciding factor.

If "some people" really did tell you 205/50/16 won't fit, then they're even dumber than you are.

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Old 09-05-2013, 12:46 AM   #9
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I personally think you'll struggle.
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