How OD fit works
Why diameter envelopes beat tonnage nicknames.
Suspension spring fit
Strut compressor size by spring OD
Measure coil outside diameter in inches. Match a 6.7, 7.9, or 11.5 in max-OD strut compressor class — or NO_MATCH.
Suspension spring fit
Result
Smallest published OD envelope that contains your measured coil OD. Floor 2.8 in · ceiling 11.5 in.
From measurement to decision
Open the calculator
Same tool with worked checks.
6.7 vs 7.9 vs 11.5 in
When each class fits.
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