Sign up now and receive 2% Orange Cash back (Store Credit) on all orders - Learn More

Free US shipping on all orders over $400.

Supermiata Boxmount 11.75″ Front Big Brake kit 90-05 MX5

From: $1,175.00

Product Description

"BX1175" Boxmount™ Big Brake kit - Front

11.75 x 1.1" rotor - Wilwood Superlite caliper

 Patented Boxmount technology reduces lug mount deflection resulting in a firmer pedal and more predictable braking. The boxmount also allows much greater cooling airflow without sacrificing rigidty. The best cooling and thermal mass of any NA/NB brake system in the world. Works with all years ABS systems. Complete kit, all mounting hardware included. Duct and hose kit optional upgrades, coming soon.

Not all BBK's are created equal In 15 years of sprint, time attack and endurance racing (and many victories), we have learned a lot about high performance brake system requirements. Many will focus simply on maximum rotor diameter and lightest weight. But this approach ignore important details. Even small OEM brakes can easily lock Hoosiers. The BX1175 was designed with a focus on thermal capacity, pad life and brake feel. The rotors were chosen not only for the diameter, but for overall thermal capacity. Increased thermal capacity combined with the large pad thickness decreases fade,and knock back while greatly improving the life of the pads. The boxmount brackets decrease deflection improving feel and consitency under braking. Wether you're racing and need the reliability and consistency or you're a track rat the BX1175 provides the best braking experience.

OPTIONAL Brake duct kit now open for pre-order! Use the drop down menu above to add it to your BX1175 order for a 5% discount on the ducts. Learn more about the duct kit here.

Confirmed fit without spacers:
15x11 Jongbloed Series 500
15x10 +25 Jongbloed Series 500
15x10 +25 949 Racing 6UL
15x10 +25 Konig Dekagram
15x9.5 +29 Konig Freeform
15x9.5 +29 KE Motorsport
15x9 +35 Konig Dekagram
15x9 +35 KE Motorsports
15x9 +35 Sparco FF1
15x8 +28 Advan TC4

Wheels that fit with spacers
15x9 +36 Jongbloed with 5mm spacer
15x9 Advanti S1 +35 with 7mm spacer
15x8 Konig Countergram +25 with 20mm spacer
15x9 6UL (Gen4) +36 with 25mm spacer

WHEEL FIT TEMPLATE  Download and print the template, trace to hard material (plastic, cardboard) and place in your wheel. Wheel fit tool - Use this tool to check brake clearance with your wheel. You can also print your own tool here:

15x10 +25 offset: Fits all brands without spacers 15x9.5: Fits all brands without spacers 15x9: Check with template or confirmed list. Does not fit 6UL. 15x8: Check with template or confirmed list. Does not fit 6UL.


See our brake system FAQ for more information on choosing brake system components for your Miata

  • Wilwood Forged Superlite 4 piston aluminum front calipers, gray anodized
  • Billet CNC 6061 T06 aluminum hats, hub centric
  • 11.75" x 1.10 Left & Right Directional Vane or optional straight vane competition rotors
  • Braided stainless, orange hoses
  • Billet CNC aluminum brackets, orange anodized
  • Steel Boxmount braces
  • All hardware and instructions included
  • Your choice of 7420 plate pads (20mm), or choose to omit pads

BP-20 base pad an excellent choice for a daily driver that is not focused on competition use. Select one of the upgraded G-Loc compounds for increased performance.  

Compound guide




Be the first to review “Supermiata Boxmount 11.75″ Front Big Brake kit 90-05 MX5”

Your email address will not be published. Required fields are marked *