Griggs 4on4 Brake Clearance - Ford Mustang Forum

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Joined: Feb 2008
Location: Everett
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Griggs 4on4 Brake Clearance

I'm installing a Griggs Racing 4on4 brake system on the front of my GR350 equipped '65, and it turns out my S197 Bullitt wheels don't clear. The rotors are 13.5" diameter, the outside of the caliper is 7.5" from the centerline, and the caliper sticks out 1.75" from the wheel mounting surface. I know that '95 Cobra R wheels fit, since that's what the brakes were designed to fit under. At the moment, I can't afford new wheels, so I'm looking at whatever I can find on Craigslist, such as 2000 GT 5-spokes or 2014 17" V6 wheels. So, I'm primarily looking at 17" wheels in 8-9" width. Gotta be over 15 1/8" inside diameter to keep from taking off wheel weights that might be inside the rim, and 1.8" from the mounting flange to the back of the spokes. Fenders are getting rolled anyways, so I'm not worried too much about backspacing.

As a point of reference, it's probably pretty close in fitment requirements to the 2000 Cobra R brake kit.

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Proud owner of a '65 289 coupe w/ T5. Equipped with Edelbrock Performer intake, Quick Fuel 680HR carb, flat-top pistons, Comp Cams Xtreme Energy valvetrain with XE262H cam, Hedman longtube headers, MSD ignition, and decked and ported heads. Suspended by 600# 1" drop front and stock rear springs, KYB shocks front, 1" front sway bar, 1" Shelby drop, Griggs Racing GR350 rear suspension. Many more mods to come!
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