Scrubbing in procedure

Avon Motorsport recommend that a standard scrubbing in procedure be used whenever possible (conditions and regulations allowing). This consists of subjecting the tyres through one gentle heat cycle, gradually loading them up whilst avoiding drifting the sidecar. This should take about three to four laps and the last lap
should only be about 80% race speed. A correctly scrubbed in set of tyres will always give more consistent performance over its lifetime than a set that has been used hard from new and will help to avoid problems such as “Cold Graining”. It should be noted that it is the loading of tyres that introduces the significant heat, not sliding or wheelspinning.