I've seen it done on an R5K and an MC16. NSR.Wayne reported it needed modified link plates when he tried it on one of his MC18's, but didn't have time to experiment*. I would think you can probably do it with a mix'n'match of stock MC18 and MC21 parts though.
17" MC21 wheels will slot straight into an MC18 swingarm though, so you don't need to change it just to run a different wheel.
*Probably too busy building "special" gearboxes with Jeff350lc!
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Andy.
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Last edited by Andy on Sun Jan 18, 2009 2:36 am; edited 1 time in total