Brake rotor size?

1997 TOYOTA 4RUNNER
309,000 MILES • 3.4L • V6 • 4WD • AUTOMATIC
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EMILIANOG19
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So, for my vehicle listed above Limited, I ordered some rotors, and they were too small (297mm) and I see they also have the 319mm and they fit, but I want to know why they fit and why the other didn’t fit.
May 24, 2023 at 8:36 PM
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BRENDON S
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Hello EMILIANOG19,

The bolt pattern looks to be slightly different.

Outside Diameter (mm): 296mm
Bolt Pattern: 6 On 139.7mm

Outside Diameter (mm): 319mm
Bolt Pattern: 6 On 140mm

So, the first number is obvious the 6 stands for the number of studs, but the second number is the diameter of the circle the studs make.

Thank you,
Brendon
May 25, 2023 at 5:19 AM
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STRAILER
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The 319mm rotors usually require 16-inch or larger wheels to clear the larger calipers.

The 297mm rotors are for 4Runners with 15-inch wheels.

Feb 10, 2025 at 12:00 PM
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