I've read that longfields will wear prematurely cause they're softer than OEM birfs (well the cage/star is softer). Being that my 60 is my dd and I live in Alaska, my hubs stay locked in for 6 months. This last winter (some snow is still on the ground BTW :) I locked my hubs in on 11 Nov and finally unlocked them at the begging of April. Not quite 6 months but long enough. I'm running 33" and haven't broken a birf yet (knock on wood), but I want to carry spares. Especially now that I have a locker in the front. I'm thinking of getting a set of Longs for spares. When I break one, swap the broken OEM birf with a long. When I get home, I'll swap the non-broken OEM birf with the other Long. My only concern is the premature wear thing. Is premature wear only relative? As in they'll just wear faster than OEM bifs. Are they going to wear out in a year or less? What do you guys think?