The lightweight STR-21 caliper was designed to be used for the rear axle that requires less pad volume than the STR-22 and non-vented, solid rotors. This package can be implemented in smaller wheel diameters, typical of most front-wheel drive race cars. Even with its smaller size, the STR-21 maintains caliper stiffness and optimal pad wear to provide the best performance in its class. 

  • MIL-spec hard anodizing on calipers resists color change or fading

  • Forged and weight-optimized, up to 20 percent lighter than standard calipers

  • Stiffest calipers available with patented strengthening bridge for improved pedal feel and modulation

  • Eliminates pad taper wear and provides consistent, confidence-inspiring performance

  • Calipers and piston sizing specifically matched to each application



Classification

Number of Pistons
2
Weight
2.72lbs
Max Rotor Outer Diameter
313mm
Rotor Thickness
6mm; 10mm; 15mm; 20.6mm; 25.4mm
Piston Range
26-44mm

Mounting

Radial/Axial
Radial
Mount Spacing
95mm
Hole Size
10.4mm
Offset from Centerline
29.7mm; 31.5mm; 34mm; 36.8mm; 39.2mm

75Compatible Pad Shapes

Pad Shape
7736-D31 7736-D31 7230-D335 7582-D709 7582-D709
Pad Thickness
14.3mm 14.0mm 13.5mm 14.8mm 14.8mm
Pad Volume
23cm3 22cm3 19cm3 26cm3 26cm3
Pad Annulus
61.5mm 49.1mm 49.0mm 49.0mm 44.5mm
Pad Drawing




Notes
Anti-squeal shim attached Includes Hardware Kit