I have some SRi-T rims and the last couple of time i have had to replace tyres it has always been the inner parts that have worn faster then the rest.
Ther wheels always balance up well and dont need that much lead. I have the tracking checked on a regular basis.
Just checked today after the RR and both fronts are shot, main part of the tread has around 3 /4 mm left and inner is on the limit now.
Does anyone else suffer from this. dunno..