This Yokomo YOKYS15675L long-type spring is supplied in purple as 1pr and is intended for touring car shock assemblies where extended springs are used. The specification of 1.5mm wire diameter and 6.75 windings gives a particular spring curve that sits in a tuner's range between softer and stiffer options.
Fit the spring when you need extra travel or a different roll balance; it can act as a direct swap or as one step in a progressive spring change to tune handling. After installation, measure ride height and preload and compare lap-to-lap behaviour to confirm the perceived change in traction and roll control.
For correct installation seat the spring squarely on the perch and check for any binding during suspension movement. Test on a consistent track section and avoid changing more than one variable at once to accurately assess the spring's contribution.
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