// Performance Calculator
Piston Ring Gap Calculator
Estimate piston ring end gaps based on bore size and engine application.
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Enter the finished bore diameter in inches — toggle above to switch units
Top: ×0.0040 | 2nd: ×0.0050
Oil rail minimum end gap per Wössner guidelines: 0.38 mm / 0.015" — verify against manufacturer spec.
Enter a bore size above to see recommended ring gaps.