hiyas, I had my front PR4 replaced today after 34,158km with a new one in readiness for the big lap. No photos (d'oh!) but it still hadn't reached the wear bars - I reckon it still had 2-3000 left in it too
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So, it would have given my PR3 world record (37,000km) a run for its money. I'm know the PR4 doesn't have the extra 20% on the PR3 as marketed when they came out, but still damn good to me, especially with the handling.