Brake rotor size?

Tiny
EMILIANOG19
  • MEMBER
  • 1997 TOYOTA 4RUNNER
  • 3.4L
  • V6
  • 4WD
  • AUTOMATIC
  • 309,000 MILES
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.
Wednesday, May 24th, 2023 AT 8:36 PM

2 Replies

Tiny
BRENDON S
  • MECHANIC
  • 653 POSTS
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
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Thursday, May 25th, 2023 AT 5:19 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,859 POSTS
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.
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Monday, February 10th, 2025 AT 12:00 PM

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