Ross / Oshmo Pistons


Ross / Oshmo Pistons

SKU: O11-11-1000 Categories: ,

Product Description

Ross / Oshmo Pistons For Your BMW Boxer Engine

Drawing on over 30 years of piston design from Ross Racing Pistons, Osh M. and Ross developed this high quality forged piston kit for the Airhead BMW Boxer engine.  ROSS Racing Pistons have met the continual need for the most advanced forged pistons in the racing and street performance industry. From the most sophisticated design and analysis software in place at Ross to their ultra modern CNC machining centers, Oshmo brings you a dedicated piston design specifically for the BMW Airhead Engine.

9.5:1 Compression Ratio. First Oversize – 900cc piston for all around street performance.

This piston is for the steel cylinder barrels found on the the R90 model. You can also use this piston on the R60 and R75 models by utilizing R90 barrels and hone to the first oversize of 90.25mm.

9.5:1 Compression ratio.

Ross / Oshmo Forged Piston design.

  • AP Performance light weight ring package.
  • Forged Piston
  • Heavy Duty Wrist Pin


Fully dyno tested and now running in our own bikes, this piston is one of the leading choices for sporting engines.

Oshmo – Pauter Forged connecting rods recommended for sustained engine speeds. for more piston info.


For technical questions on this product please use the contact page.


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