2015 GT Caliper conversion problem

OvalSports · May 23, 2022

So we put on these huge 14” Boss rotors and Boss 19” rims using 2015 4-piston (non-Performance Pack S550) calipers, but the inside of the boss wheels seat against the calipers.

Anyone run into this problem?
Simple wheel spacer solution, or did we do something wrong?

bambam 06 · May 23, 2022

A 1/8" aluminum spacer will probably resolve that issue.

bl817 · May 24, 2022

did you use the washer/spacer between the caliper and the wheel hub? there is a write up on all parts needed in the V6 section. the spacer should pull the caliper away from the rim enough to clear. the Boss rims clear 4 pot Brembo clalipers so i think you have a spacing issue. good luck

OvalSports · May 24, 2022

Thanks for the reply. Yes, we spaced the caliper as imaged between the caliper bracket and the caliper, but it actually pushes the caliper out towards the rim. This is what counters the proper wheel offset, but it is required to center the rotor.

OvalSports · May 24, 2022

Update:
Installing 7mm wheel spacers on the front to counter the caliper adjustment did the trick.

View attachment 82865

xeninworx · May 25, 2022

Yeah the S550 hubs stick out further compared to the S197 hubs so the calipers on a S550 are recessed. This way Ford doesn’t have to use lower offset wheels to clear larger calipers. The S550 4 piston caliper is thicker than the 4 piston Brembos.

2015 GT Caliper conversion problem

OvalSports

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bl817

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