Smaller rotors on IRS rear

[jdm65]

I currently have a Cadillac ATS front brake setup planned for my Gen3 Coupe build, which gives me a 13" rotor up front

Unfortunately, I also have a 13" rotor out rear as I have a takeout subframe from a 2020 Bullitt Mustang

Is there any solution to go down in rotor size with an IRS rear? Maybe an offset caliper mounting bracket that allows me to run a smaller rotor?

Thanks in advance!

[michael everson]

There is but why would you want to? Look at FFRs 15 inch wheel IRS brakes.
Mike

[Erik W. Treves]

FWIW the car is weight biased to the rear and actually needs more rear bias - so larger rear isn't a bad thing - if your wheel choice will handle it.

[jdm65]

FWIW the car is weight biased to the rear and actually needs more rear bias - so larger rear isn't a bad thing - if your wheel choice will handle it.

Makes sense!

So long the braking force front to rear isn't too funky, I have no problems with it then. Wheels are 18". Just wanted to see if there were any options out there - thank you!

[Gordon Levy]

You want the big rear brakes. These cars require far more rear brakes than anything you have been used to in the past.

[jdm65]

You want the big rear brakes. These cars require far more rear brakes than anything you have been used to in the past.

Very interesting!

Thanks for the information everyone!

Sounds like a non issue then haha