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The Mahle single piston specified for BMW S55 applications is produced to the listed dimensions: 84.00 mm bore compatibility, 89.6 mm stroke and a 144.35 mm connecting rod length with a 22 mm wrist pin. The piston is documented at -10.5 cc and a 10.2:1 compression ratio, supplying the dimensional detail needed for accurate replacement or engine assembly in S55-equipped builds.
Mahle MS Piston Set BMW S55 84mm Bore 89.6mm Stroke 144.35mm Rod 22mm Pin -10.5cc 10.2CR Single
