From the research I did.. Magnesium wheels suffer when they lose the paint/coating and become weathered and/or if the wheel has been tampered with.. as with age they go brittle.. so whilst these wheels where ok over ten years ago they have aged and been refurbed, welded, scraped, dinged etc and generally had a hard life through motorsport. A proper WRC wheel will have a FIA date stamp so the wheel only had to last ex-amount of time before being binned. I was told by a mag wheel repairer that the early mag wheels where banned from motorsport due to constant cracking. Was also told by someone at M-Sport that some had foam inside incase of loosing air on stage.. denoted by a silver circle sticker.. which some of my ex M-sport OZ mags had.

I would never buy older mag wheels again unless they where either new or unrefurbished in very good condition. and unless you have a race/rally team budget to be able to replace the wheels instead of repairing them its a bit risky. Hence why I have 9 OZ mags now

Mag wheels barely bend as they are so strong so if hit hard enough they with crack instead.. Anyone remember the pics of damaged superleggas rarely bent but loads of pics of cracks and snapped spokes etc The weakest point seems to be inner outer rim where cracks apear.

Speedlines seem to be the best mag wheels these days just don't like the styles in 18" and wouldn't fit 19's