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For what its worth and I am not for sure....its my understanding that none were solid magnesium. They were all a magnesium/aluminum alloy. From the my old chemistry days, I remember that solid magnesium is highly volatile in air. To the point its explosive. The older ones (60s...early 70s) did have a much higher content of magnesium than ones from like the 80s. I think its safe to say, the lighter the wheel, the more magnesium it has...providing dimensions are equivalent. Be careful when shopping for true cromodoras to ensure that there is no deterioration around the center. The heavy mag content cromos are known to rot in the centers.....even to the point where big chucks come out of the center. This I know for sure as I have seen cromodora wheels that it has happened to.
Best Regards,
John M
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1978 AR Spider Veloce 2000....the first and still here
1984 AR Spider Veloce............the second & gone to the parts bin
1992 AR Spider Veloce............the third and still here
1991 AR 164L........................traded on the SS
1965 AR Sprint Speciale..........in boxes.
1978 AR Spider Veloce 2000...its slow black & rusty but complete and original!
Last edited by John M; 10-15-2003 at 11:32 AM.
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