[swamp2]

Calling a quote from Skippy proof is a bit of a stretch. Even saying there was any scientific approach to gather this information is probably a stretch. I would tend to trust what they write about track or race tires more than street tires as the author(s) surely have way more experience with track/race tires at the track.

We now have three folks here with the exact same experience with street tires. My observation of the effect is not subtle and just like SFP above I concur traction new is poor, after a short break in period until extreme wear the traction is relatively constant, finally resulting in markedly reduced traction. I suppose the observed reduction may be related to UV or other weathering/aging effects but I think it is unlikely. My reasoning for this is because folks tend to wear their tires in drastically different amounts of time. One would tend to not see the direct correlation between wear and traction if other effects were the causal ones.