Not cheap. I love them, but is never pay £700 odd for them. They're ok at £300 (cheaper than custom wheels on Hope or Ringle hubs).
My 521's seem pretty tough; I went to Brum BMX track last night and hooked up on a few of the step ups (hard at times) and they're still pretty round.
My 521's seem pretty tough; I went to Brum BMX track last night and hooked up on a few of the step ups (hard at times) and they're still pretty round.