Andy makes a useful point about mag rims.

Also, for anyone running RS / HRC mag rims, a word of warning. I have just had some rims stripped and crack tested, prior to chromating & powder coating.
One of the rims, which I bought 'blind' on an online auction some time ago, was cracked.

The £300 (cost to me) rim is junk, but I'd rather know the integrity of my wheels.

For anyone with older RS / HRC mag wheels (which many are > 15 years old), my advice would be to get them checked.
I can supply the company details, the guy is an ex production manager at Dymag and knows his stuff.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30