V8R StopTech ST42 11.750″


SKU: V8R-181 Categories: , , ,


The V8R ST42 kit was designed from input and feedback from the MX5 community to meet the performance and price point criteria for the weekend warrior track rat, while providing the refined street performance expected at this price point. The 11.75″ versions meets SCCA STU and STL rules.

Calipers: Featuring ST42, the smallest and lightest 4-piston caliper developed from StopTech at 4lbs. Designed with high fluid pressures and forces in-mind, the ST42 is the preferred option for blade type rotor systems. The stiff, lightweight ST42 caliper provides a level of performance that did not exist before. The ST42 embeds the same race-winning paradigms of low mass, stiffness, patented bridge bolt, and application flexibility. ST42 calipers are forged with machine finish.

Rotors: Mounted over 11.75x.810″ straight rotors and V8R fixed hats.This is a motorsports-level brake solution with enough civility to use on a daily-driven car.

Pads: Our kits are sold without pads to allow the end user to select the pad type that best suit their needs. We offer a handful of pad options and would be happy to provide insight to what pads would work best for your needs.

 This kit uses the DR22/Wilwood 7816 pad shape(16mm). That means there are already a huge amount of pads for this kit! Pads are readily available for this brake kit from the following manufacturers:

  • Hawk Performance
  • Porterfield
  • Stoptech
  • Wilwood
  • Performance Friction
  • Ferodo
  • Raybestos
  • G-Loc
  • Carbotech
  • Cobalt

Wheel Fitment: When wanted to offer the best performance in every single category, including wheel fitment. Our 11.75″  kits will most current aftermarket 15″ wheels. Fitment template is available via email. Proper wheel clearance is responsibility of the end user.

Design: All V8R parts are CAD designed and FEA tested and machined in house with today’s latest CNC equipment. This kit has been tested extensively in the harshest conditions, both on the street and at the race track.

Spare Parts: Like any kit destined to be used for years on track, the ready supply of spare parts is incredibly important when considering whether or not to buy an aftermarket braking system for your NA & NB. We took this into consideration when designing this kit, and as such are able to keep the price of consumables lower than almost any other brake kit on the market today. Rotor rings, brake pads, and hardware are all readily available through us, as well as many online vendors. Because this caliper uses a pad shape that has been in production for over two decades, along with a rotor size and bolt pattern shared with many off-the-shelf brake solutions, parts will always be affordable and readily available.

What’s Included

  • Stoptech ST42 Trophy calipers, made to V8R specs and matched to OEM master cylinder
  • V8R directionally-slotted floating two piece 11.75″ rotors
  • Motorsports-grade fixed mounting hardware
  • V8R billet 6061 caliper brackets with mounting hardware
  • DOT approved stainless steel brake lines
  • Type-III black hard coat anodized plated hats
  • 12oz of brake fluid


Kit removes up to 9.5lbs per corner of unsprung weight depending on year models

Additional information

Weight35 lbs
Dimensions18 × 16 × 10 in


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