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ZBUM's Nissan Z31 300ZX Wheel and Tire Limits Basic | Plus Sizing | Tires | Wheels | Disclaimer | Need more help Click here to view examples of different wheels on different Z31s. Basic Stock Information Basic Wheel Information: 4 Lug bolt pattern: 4x4.5(4x114.3) 5 Lug bolt pattern: 5x4.5(5x114.3) Studs are m12x1.25 Centerbore is 66.1mm Stock wheel information: 84-85 all(except AE): 15x6.5 +30mm 86 non-turbo: 15x6.5 +10mm 84AE + 86 turbo: 16x7.0 +20mm 87-89 non-turbo: 15x6.5 +20mm 87-89 Turbo: 16x7.0 +30mm Stock Tire Information: 15x6.5 wheels had 215/60R15 16x7.0 wheels had 225/50R16 Plus Sizing A table of tire sizes that will retain the same overall diameter, thus keeping speedometer accurate. The wheel width is my opinion on the recommended wheel width. The difference column is the difference between the tire cross-sectional width and wheel mounting surface width. Width Ratio Diameter Wheel Width Outside Dia (mm) Outside Dia (in) Diff (mm) Diff (in) 215 60 15 6.5 639.0 25.157 49.9 1.965 225 50 16 7.0 631.4 24.858 47.2 1.858 235 55 15 8.0 639.5 25.177 31.8 1.252 255 50 15 8.5 636.0 25.039 39.1 1.539 285 45 15 9.5 637.5 25.098 43.7 1.720 205 55 16 6.5 631.9 24.878 39.9 1.571 255 45 16 8.5 635.9 25.035 39.1 1.539 285 40 16 9.5 634.4 24.976 43.7 1.720 225 45 17 7.5 634.3 24.972 34.5 1.358 255 40 17 9.0 635.8 25.031 26.4 1.039 225 40 18 8.0 637.2 25.087 21.8 0.858 255 35 18 9.5 635.7 25.028 13.7 0.539 215 35 19 8.0 633.1 24.925 11.8 0.465 255 30 19 9.5 635.6 25.024 13.7 0.539 255 25 20 9.5 635.5 25.020 13.7 0.539 Tires Tires versus Offset Information Appl Model 84/85 F 84/85 R AE/86 F AE/86 R 87-89 F 87-89 R width min max min max min max min max min max min max 205 3 42 3 62 -17 42 -15 62 -7 52 -12 72 215 8 37 8 57 -12 37 -10 57 -2 47 -7 67 225 13 32 13 52 -7 32 -5 52 3 42 -2 62 235 18 27 18 47 -2 27 0 47 8 37 3 57 245     23 42 3 22 5 42 13 32 8 52 255     28 37 8 17 10 37 18 27 13 47 265             15 32     18 42 275             20 27     23 37 285                     28 32 Wheels Wheel Offset Information Appl Model 84/85 F 84/85 R AE/86 F AE/86 R 87-89 F 87-89 R width min max min max min max min max min max min max 7.0 2 41 2 66 -16 41 -14 66 -6 53 -6 76 7.5 9 34 9 59 -9 34 -7 59 1 46 1 69 8.0 15 28 15 53 -3 28 -1 53 7 40 7 63 8.5 21 22 21 47 3 22 5 47 13 34 13 57 9.0     28 40 10 15 12 40 20 27 20 50 9.5     34 34     18 34     26 44 10.0             24 28     32 38 DISCLAIMER These numbers are for cars with the stock suspension. Please note that these are slightly conservative estimates. Not all wheels are created equally and may have more or less overhang depending on manufacturer and design. These numbers were calculated based off unverified information provided by users of wheelshow. Numbers were mostly based off 17" wheels. Offset information will only vary by +/- 1mm for each 1" difference in diameter. Tire sizing information is based on tires that fall within the original overall tire diameter of 25 inches. The tables above show offset ranges. Pick an offset between the minimum and maximum recommended offset. Lower offset numbers will bring the tire/wheel out to the edge of the car. This is Good! Higher numbers will set the wheels farther under the car. This is battleship and this is BAD! NA strut housings will allow for a slightly higher offset. Adding spacers will reduce the offset number. i.e. Adding a 25mm spacer/adapter to a wheel with 25mm offset will effectively create a 0 offset wheel. I NEED MORE HELP Spacers can only lower the offset. To get more offset, you'd have to shave the hub of the wheel. This would be very expensive and then you might not clear your brakes. Lucky for you, most wheels available these days already come with high offsets. To figure out how much of a spacer/adapter you need, it is only simple math. For instance, you pick up a set of wheels that are 17x7 with an offset of +42 for your 86 300ZX. First, expect people (especially butter) to laugh at you. Second, get some adapters IMMEDIATELY. To determine the actual spacer width you need, look at the chart above. Find the 7.0" width row. Find the applicable year column. Look at the number where they meet. Minimum recommended offset is -16mm. To determine thickness, you subtract the recommended offset from the wheel's offset. In this case, you'd subtract -16 from 42. 42 - (-16) = 58. You'd want spacers/adapters that are 58mm thick. Or roughly 2".