Posting this in Race Prep because this is exactly where it's most relevant. New release from V8Roadsters that we're very excited about.
By now everyone's seen the Stoptech 11" brake kit for the NA/NB. Some very cool elements in that kit, great calipers. But, someone over there missed the memo that the collective Miata performance community figured out how to fit 11.75" rotors under the car about a decade ago. For many of us running 11.75" kits now, downgrading on rotor size for less braking torque and thermal capacity as a trade-off to get a more rigid caliper isn't a great recipe.
We weren't the only ones wishing ST had done their kit in 11.75". V8R designed a new bracket to fit the ST42 and STR42 calipers over the super popular 11.75" rotor, then they worked with ST to refine the outer shape of those calipers to improve wheel clearance.
** STR42 caliper pictured**
The ST42 caliper is a forged/machined caliper with bridge bolt that is super rigid. The STR42 is a true motorsport-grade billet version of the ST42. Both take ST's DR-22 pad shape which is the same as Wilwood's 7816 pad so there are lots of pad options.
We will be offering these kits complete with AP Racing rotor option and will have Porterfield and PFC pad options shortly. I have some PFC pads on the way to verify fitment.*
All of the 11.75"" kits use the 36/38mm piston size (3.34 in³ piston area) which balances very well with a Sport package rear brake setup or similar.
Perhaps the best part... The price on these kits is competitive with the standard ST 11" kits.
Above: 15x8 Black RPF1 +28mm
If you're considering running this glorious kit, you're on 15x10" wheels right? Riiiight? That said, we'll be getting lots of inquiries about which wheels fit so here's what we've tested so far:
15x10 6UL and 15x10 Jongbloed have tons of clearance
15x9 6UL (gen 1): tight but OK
15x9 6UL (gen 2 & 3): Spins but clearance is too tight. Needs 5mm spacer to get minimum acceptable clearance
15x9 6UL (gen 4): Contacts the barrel. Needs 10mm spacer to get minimum acceptable clearance
15x9 Storm S1: OK
15x8 RPF1 +28mm: tight but OK (surprisingly)
Picture above: 15x10 Tungsten 6UL