Sounds like you got the expected mileage out of your 21's given how these vehicles go through tires. I've run OEM spec 20's and 21's for years (Pirelli, Bridgestone, Michelin) on my E70 & F15 - 20K miles is about all your going to get. You might get 25K but they'll most definitely need replacing by then, if not sooner.
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