Might do. The RX7 4-potter is probably no taller than the S13 caliper.

S13 250 mm rotor is 18 mm, but you could use shims behind the brake pads to take it out to 22 mm. Like maybe an extra pad backing plate.

The 251 mm x 20mm S13 disc might be a better choice, it was also used JDM R32

would the S13 250mm disc work? I'm not sure of the thickness of them..?

Quite interested in this as I am looking at upgrading my front brakes on my sedan

Yes. The key is to use a smaller disc rotor than the RX7 rotor. RX7 4-pots normally use 276 mm discs, same diameter as the Verada/Diamante discs all of which normally take 15" rims.

The question is what discs to use?

If you were to put say Stanza/Sunny 245 mm discs on, it could fit under some 13" wheels. To fit the Stanza discs is fairly easy, however, they are only 10 mm thick, while the 4-pots are designed for 22 mm discs.

this 1200 has what look like RX7 4-pots on the front, and it runs 13's

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yes i see..
Some comparison shots between nismo mk63s and rx7 series 4/5 calipers.
But will still try to fit the rx7 calipers under 13s if possible.

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Here's another look at WHY the RX-7 caliper need bigger wheels:



CALIPER DISC HEIGHT (Dimension 'E')
* Hilux 63 mm
* RX7-S4 80 mm

Quote:Nissan 4-pot calipers are more compact.

The RX7 4-pot calipers have a huge mount, so the pistons are high above the mounting ears.

Nismo MK63 calipers mount low



Nissan R32 are similar but mount a litter higher (intended for larger 280 mm discs)


These come in two versions )1 for 26 mm thick R32 rotor, and 2) for 30 mm thick R32 rotor. Brake pad spacers can be used with thinner rotors.

Hilux 4-pots are even more compact, so will fit with small rotors.

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The RX7 caliper will fit under 13" wheel. The RX7 276 mm disc rotor won't fit with 13" wheel.

For example, fit the 4-pot caliper to the 212 mm 120Y rotor. It will require a different kind of mounting to get the caliper fitted that close to the spindle, perhaps a ring mount. Brake pad spacers can be used with thinner rotors.

You can fit the RX7 caliper with 252 mm rotor under some 13" wheels (but not all 13" wheels). 252 rotor comes with 280ZX. Or with 250 mm rotor from S13. You can notch the caliper to get it that close to the spindle, 4-pot caliper can be ground a long way to get it close.

Thank heaps mate.Really appreciate your offer.
as soon as i get the car resprayed and a roadworthy, i will pm you and come see what we can do.
Thanks mate

Your welcome to come look at offsets ect I have some stuff here we can play with, I'm only local to you. I just don't have my car currently here as its getting tuned. But welcome to come try on some struts and we can try sort something