Wiseco RCS09850 Tapered Ring Compressor Sleeve 98.5mm Bore

The Wiseco RCS09850 is a bore-specific tapered ring compressor sleeve precision-machined for a 98.5mm bore. Designed to take the guesswork and risk out of piston installation, this sleeve guides the piston and rings smoothly into the cylinder bore without the damage risk associated with traditional band clamp or split-style ring compressors.

Key Features:

• Machined from Wiseco sleeve forgings — same material toughness as Wiseco's forged pistons
• Hard anodized and Teflon coated for low friction and long-term wear resistance
• Smooth tapered radius compresses rings evenly and gradually as the piston is pushed through
• Bore-specific design — sized precisely for 98.5mm bore applications
• Universal piston compatibility — works with pistons from any manufacturer
• Dramatically reduces difficulty when installing thin, high-performance oil rings
• Eliminates bent or broken rings caused by improper installation techniques

Unlike adjustable band clamp compressors, the Wiseco tapered sleeve design allows the piston to enter the cylinder with minimal resistance, providing superior precision and control throughout the installation stroke. This makes it the preferred tool for professional engine builders and performance enthusiasts working with modern, thin-section piston rings. Part of Wiseco's full line of RCS tapered ring compressor sleeves, available in sizes ranging from 65.5mm to 105.1mm.