8x170 Bolt Pattern
8x170 means 8 lugs on a 170.0 mm bolt circle, which is 6.69 inches, so the same pattern is written 8x6.69. Check a measurement against it below.
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8x170 dimensions
| Measurement | mm | inches |
|---|---|---|
| Bolt circle (PCD) | 170.0 mm | 6.693 in |
| Neighboring studs, center to center | 65.1 mm | 2.561 in |
Measure from the center of one stud to the center of the stud directly across.
Close patterns
| Pattern | Difference |
|---|---|
| 8x165.1 | 4.9 mm (0.193 in) |
Driven Products notes that a 5-lug measurement with a tape is only an estimate unless you use a bolt pattern gauge. Patterns a millimeter or two apart need a gauge or the wheel's stamped size to tell apart.
Every way to write it
| Unit | Value |
|---|---|
| Millimeters | 170.0 |
| Inches | 6.693 |
| Centimeters | 17.00 |
| Neighbor studs (mm) | 65.1 |
To convert, divide the millimeter figure by 25.4: 170.0 ÷ 25.4 = 6.693 inches. Going the other way, multiply inches by 25.4.
Measuring with a tape
Center to center straight across reads the bolt circle directly: 170.0 mm (6.69 in). Neighboring studs are 65.1 mm (2.56 in) apart center to center, which is a useful second check.
Other 8-lug patterns compared
| Pattern | Bolt circle | Difference | In inches |
|---|---|---|---|
| 8x165.1 | 165.1 mm | −4.9 mm | -0.193 in |
Wheels must match the bolt circle exactly; an adapter is the only way to mount a different pattern.
What your tape should read
For 4, 6 and 8 lugs the first column is center to center straight across; for 5 lugs it is center to center across one skipped stud. The second column is the distance between neighboring studs, a handy cross-check on any pattern.
| Pattern | Main reading | Neighbor studs |
|---|---|---|
| 4x100 | 100.0 mm (3.94 in) | 70.7 mm (2.78 in) |
| 4x108 | 108.0 mm (4.25 in) | 76.4 mm (3.01 in) |
| 4x114.3 | 114.3 mm (4.50 in) | 80.8 mm (3.18 in) |
| 5x100 | 95.1 mm (3.74 in) | 58.8 mm (2.31 in) |
| 5x108 | 102.7 mm (4.04 in) | 63.5 mm (2.50 in) |
| 5x112 | 106.5 mm (4.19 in) | 65.8 mm (2.59 in) |
| 5x114.3 | 108.7 mm (4.28 in) | 67.2 mm (2.65 in) |
| 5x120 | 114.1 mm (4.49 in) | 70.5 mm (2.78 in) |
| 5x127 | 120.8 mm (4.76 in) | 74.6 mm (2.94 in) |
| 5x135 | 128.4 mm (5.05 in) | 79.4 mm (3.12 in) |
| 5x139.7 | 132.9 mm (5.23 in) | 82.1 mm (3.23 in) |
| 6x114.3 | 114.3 mm (4.50 in) | 57.1 mm (2.25 in) |
| 6x135 | 135.0 mm (5.31 in) | 67.5 mm (2.66 in) |
| 6x139.7 | 139.7 mm (5.50 in) | 69.8 mm (2.75 in) |
| 8x165.1 | 165.1 mm (6.50 in) | 63.2 mm (2.49 in) |
| 8x170 | 170.0 mm (6.69 in) | 65.1 mm (2.56 in) |
Computed from the bolt circle: straight across = PCD; skip one (5 lug) = PCD × sin 72°; neighbors = PCD × sin(180° ÷ lugs).
Before you buy wheels
- The stud count and bolt circle must match exactly; a wheel drilled a millimeter or two off will not seat properly on every stud.
- Check the center bore and the lug nut or bolt seat type along with the pattern.
- When the wheel lists its pattern, compare it with the number stamped on your current wheel rather than a tape reading.
Common questions
Is 8x170 the same as 8x6.69?
Yes. 170.0 mm ÷ 25.4 = 6.693 in.
What is 8x170 in inches?
8x6.69.
How far apart are neighboring studs on 8x170?
65.1 mm center to center.
Related calculators
Sources
- https://tiregrades.com/tire-anatomy/wheels/how-to-measure-bolt-pattern
- https://drivenproducts.com/blogs/wheel-and-wheel-accessory-terminology/wheel-bolt-patterns-and-bolt-circles
- https://www.cokertire.com/blog/measuring-wheel-bolt-pattern/