Supermiata Xida Coilovers for Mazda MX-5 NC


Supermiata Xida Coilovers for Mazda MX-5 NC

Supermiata’s Xida coilovers have the accolade of securing more national road racing championships than any others in the world. Working with TractTive Suspension in the Netherlands for the dampers and Swift Springs in the USA for the springs, Supermiata have put together the ultimate MX-5 coilover for motorsport. Unlike most other coilovers, the damper bodies are designed specifically for the MX-5 application.

By optimising the length and utilising a single perch design, the damper can be packed with as much fluid as possible, preventing overheating and increasing efficiency. Offering more damper stroke than any other coilover on the market ensures the suspension can do the work it needs to before hitting the bump stop prematurely. The rear damper is inverted to provide even greater stroke than is usually available. The double-digressive damper is adjusted by a single knob to tune compression and rebound together, simplifying the setup and ensuring everything works in harmony together.

The exceptional valving of the TracTive Suspension dampers combined with superior quality springs from Swift Springs generates unprecedented levels of grip over all paved surfaces, without compromising the quality of the ride. The digressive damping makes the handling ultra-sharp and delivers enormous amounts of grip, yet allows the car to glide over trackside kerbs without becoming unsettled.

These Xidas include the billet coaxial top mounts.

Real World Review / Comparison vs Ohlins

Recommended spring rates

  • 11 kg/mm /7 kg/mm road legal semi-slicks—Track or autocross focused, 40~100tw for racing or up to 200tw for track days
  • 5 kg/mm /4 kg/mm touringStreet comfort, not for 200tw or race tyres


  • Single adjustable, compression & rebound adjustment together, 20 step
  • Inverted rear design for longer travel
  • Full aluminium monotube construction
  • 46mm double digressive piston
  • Billet Coaxial Mounts front and rear
  • Helper springs allow for lower ride heights without leaving the springs loose
  • Adjustable height spring perches
  • Torrington thrust bearings
  • Custom wound high-rate helper springs
  • 171mm stroke rear, 126mm front stroke
  • High-pressure nitrogen charged
  • 2.5″ diameter springs
  • Ultra-wide damping adjustment range

Confused about ordering?

If you are not sure which spring rate package to order for your project, give us a call, email or contact us via Messenger. We’ll get the system matched exactly to your needs.


Additional information

Shipping Weight 21.772 kg
Shipping Dimensions 76 × 30 × 30 cm



11/7 kg/mm, 5/4 kg/mm


Mk3 (05-15)

Warranty information

Warranties cover defects in materials and workmanship only. Warranty is for replacement of a similar product, repair of the original product or refund of the purchase value only and excludes all labour and incurred charges including towing, fitting, inconvenience, and purchases of other manufacturer's products. The warranty is good for the period stated in the additional info tab from the date of purchase. Mileage warranties are for road use only and proof of mileage is required. Products must be installed by an independent experienced professional mechanic and the suspected defect must be present at the outset. The warranty does not cover damage caused by incorrect installation, failure to comply with the maintenance requirements of the vehicle, processing or otherwise changing the product, ordinary wear and tear, or any other external influences. Warranties are invalid if the product is used for racing, rallying, drifting, track days or any other form of motorsport or competition. Please refer to the manufacturer's own warranty documentation for more information.

Making a warranty claim

Proof of purchase receipt showing the date of purchase, proof of mileage at installation, proof of current mileage and invoice of the work undertaken by an independent experienced professional mechanic must be supplied along with the returned products for a warranty claim to be considered. If your vehicle needs to be used whilst your warranty claim is considered replacement parts from the same manufacturer should be purchased through BOFI Racing. In the event of a successful warranty claim, we will refund the card that was originally used to purchase the replacement parts, in full or in part depending on the nature of the claim. BOFI Racing reserves the right to make full or partial compensation at its sole discretion depending on the condition and mileage use of the returned suspect parts. For example, if you have used the part for several thousand miles before a defect is noticed, only partial compensation may be offered.

Make Model Year
Mazda MX-5 III (NC) 2005 - 2015