Good-Win Racing Mazda Performance Parts

StopTech Rear STR21 RACE Brake Kit


Miata 1990-2005 · Brakes · Brake Kits and Complete Packages

Part Number: 61-2326

Application: 1990-2005

Price: $999.00


StopTech Rear STR21 RACE Brake Kit
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A little less than two years ago, StopTech released the NA/NB BBK for the Miata. The matching rear BBK is now available, using the billet aluminum 2 piston STR21 caliper. Designed to pair with the Stoptech SPORT size front BBK.

Kit include necessary brackets, hardware and brake lines to complete installation.

Caliper - Billet/Anodized StopTech STR21 2-piston caliper: 3.5 lbs each

StopTech 2-piece calipers have the lowest amount of flex and deflection among 25 of the leading caliper models (including some monoblocks) from well-known manufacturers. This is accomplished using the StopTech patented bolt-in bridge, which is strong enough to stop distortion without sacrificing cooling through the top of the caliper.

This is a RACE kit with a super light caliper and as such there is NO PARKING BRAKE. Street users who wish to retain the parking brake should look to our Stoptech/Centric rear Sport size brake kit that includes fresh factory rear calipers.

Rotors - Slotted Sport size 1-piece

The StopTech Rear BBK is based on the NB Sport (1.8 Sport) brake size, so the new rear BBK uses stock size NB Sport 1pc rotors. If you do not already have Sport brakes, you will need to trim or remove your dust shield.


Kit ships with Stoptech 309 compound pads. These are a "triple duty" performance street pad and can be used for street, autocross and LIGHT track duty. Pairs well with a street pad in the rear such as the Porterfield R4S. Race pads can be substituted upon request.

Stoptech's Front and Rear BBKs were used on the HyperMiata to set the production car lap record at Chuckwalla Valley Raceway!

*** Product images may differ from actual product appearance ***


Thanks for such speedy and great service.

-- Richard H.

I red'all the parts in the order I placed and installed them in my car yesterday. I am beyond happy. The install went without a hitch. The results were fantastic. The new brakes track straight, make no noise, and stop the car authoritatively. The new rotors look pretty cool, which we all know isn't all that important, but having 6 women offer to bear your children, because your car looks SO cool is a good problem to have. Thank for great products and service.

-- Chaz C.