At 30K on the WR G2s on the XC, I haven't noticed any noise increase. They still ride quiet and smooth.
I've got 20K on the same tires on the MB, and they're still quiet and smooth...
So many factors affect tire wear and noise, it's hard to determine the precise reason they've gotten noisy in your cases...so far, so good in mine...
Current Fleet:
2006 Corolla (kid's car - 108K, Conti Eco Contacts, Castrol Edge 5W30)
2005 MB S600 (63K, M1 0W40)
2002 V70-XC (165K, Nokian WR G2, Pennzoil Ultra 5W30)
2002 V70-T5 (143K, IPD bars, Bilsteins, Extreme Contact DWS, Mobil 1 5W40)
1992 MB 300E (Sportline - 123K, Nokian WR G2, Edge 5W40)
1990 4-Runner (V6, 4WD, mild lift - 239K, 31" BFG AT KO, Edge 10W30)
1932 Packard Sedan (straight 8, dual sidemount spares, original paint and interior, Shell Rotella 15W40)
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