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  • the D521 are great, great rim, (even better than the newer 721??) but the bad thing is you can not find any new any more.

    second hand ones, are tricky, if the rim has been bent in one spot, they will always tent to bend again for the same spot, so no so kind in a second hand dated wheel

    You're right, if a rim is bent, you'll never make it straight and strong, but 521 wheels come up quite often on ebay, and small buckles aren't a problem. Even new rims are often out by 20-50mm.

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