Piston Ring Pliers Compressor Remover Expander Removal Tool Grip 50mm-100mm

Measure your engine's cylinder bore diameter using a bore gauge or the manufacturer's service manual specification. Select the variant whose range covers that measurement — for example, if your bore is 95mm, choose the 50–100mm variant. Using a tool outside its rated range reduces control and increases the risk of ring damage.

Yes. The jaw mechanism is designed to work with both compression rings and oil control rings across the ring thicknesses commonly found in automotive and small engine applications. For very thin or specialty rings, verify the jaw tip clearance against your ring cross-section before use.

The jaw contact points are profiled to seat against the ring ends rather than the ring face, minimizing surface contact that could cause scratching. Always ensure the jaws are correctly seated before applying force — misaligned jaws are the most common cause of ring surface marks.

Yes, provided the bore diameter falls within the selected variant's range. The 50–100mm variant is well-suited to many single-cylinder motorcycle engines, small generators, and lawnmower engines. Check your bore spec before ordering.

Yes. These pliers function in both directions — compress rings for installation into the bore, and expand them for removal from the piston. This dual-function design means you only need one tool for the complete ring service procedure.

The variants differ in their effective jaw opening range. The 50–100mm variant is sized for smaller bore engines, while the 80–120mm covers mid-range bores with an overlap zone between 80–100mm. If your bore falls in the overlap, either variant will work — choose based on which gives you more centered jaw travel for your specific diameter.